Name: Tzioumis, Tasso
E-mail: tasso.tzioumis@csiro.au
Affiliation: CSIRO Space & Astronomy
Type of presentation: Oral
Title: Introduction
Abstract: To be decided closer to the date.
Name: Basu, Avishek
E-mail: avishekbs3@gmail.com
Affiliation: Jodrell Bank Centre for Astrophysics, University of Manchester
Type of presentation: Oral
Title: Timing and profile evolution of young pulsars.
Abstract: In this presentation, I will present the results of the profile evolution and timing of a few young pulsars, observed by the thousand pulsar array project of MeerTIME.
Name: Stinebring, Dan
E-mail: dan.stinebring@oberlin.edu
Affiliation: Oberlin College, USA
Type of presentation: Oral
Title: Correcting for ISM delays in high precision pulsar timing
Abstract: TBD
Name: Limaye,Pranav
E-mail: s6prlima@uni-bonn.de
Affiliation: Argelander Institute for Astronomy, Bonn Germany
Type of presentation: None
Title:
Abstract:
Name: Stappers, Ben
E-mail: ben.stappers@manchester.ac.uk
Affiliation: University of Manchester
Type of presentation: Oral
Title: FRBs and Galactic Transients with MeerKAT on the road to the SKA
Abstract: MeerTRAP is a project running on MeerKAT which searches for transient radio emission with durations from milliseconds to seconds. I will discuss the status of the project after almost 3 years of fully commensal operation. I'll discuss the FRBs that we have discovered and also some of the Galactic transients. I will also use it as a chance to discuss some opportunities and challenges for the SKA.
Name: Possenti, Andrea
E-mail: andrea.possenti@inaf.it
Affiliation: INAF-Osservatorio Astronomico di Cagliari
Type of presentation: Oral
Title: Pulsars and FRBs at the SKA Regional Centres: perspectives and desires
Abstract: SKAO will deliver hundreds of PBy of pulsar and FRB
data during the first few years of activity. The advanced analysis of those data will be conducted within a network of so-called SKAO Regional Centres (SRCs), which will also have the responsibility to cure and archive both the original data and the advanced data products. The expected overall capability of the SRC network will be around 20-30 Pflops which opens unprecedented opportunities for post-processing and data analysis of pulsar and FRB data. A proto-SRC network is expected to be in place in a 2-3 yr timescale, likely focusing on both simulated and real data, the latter
mainly produced by the SKA precursors and pathfinders. A discussion about the best usage of the SRC activities is timely, since a refined tuning of requirements and specs is in course.
Name: Wang, Yuanming
E-mail: ywan3191@uni.sydney.edu.au
Affiliation: University of Sydney
Type of presentation: Oral
Title: High-time resolution imaging pipeline for extreme transients detection with ASKAP
Abstract: We developed a new pipeline (so called VAST fast imaging pipeline) dedicated to deep fields observed by Australian Square Kilometre Array Pathfinder (ASKAP), e.g. GW S190814bv field or the Evolutionary Map of the Universe (EMU) survey, to search for radio transients and variables on image domain at shorter timescales (seconds to minutes). The main scientific targets include enhanced scintillation, flaring stars, radio pulsars, and peculiar transients. The prototype pipeline resulted in the first discovery of a group of extreme scintillating AGNs in a linear arrangement on the sky - uncovering the existence of a Galactic plasma filament. We conducted a pilot survey on ~40 deep fields from ASKAP archival data at a central frequency of ~GHz using the prototype fast imaging pipeline. The total area of the pilot survey footprint is ~1600 square degrees, revealing 34 highly variable and/or transient sources: 7 of them are known pulsars, including 3 millisecond pulsars, and 7 of them are flaring stars. We also detected an unknown transient with substantial polarisation. More follow-up investigations are underway to understand its nature.
This is the first radio transients survey that covered a large sky area at seconds-minutes timescales down to sub-mJy sensitivity level. The results presented here demonstrate pipeline’s capability to detect transients once future ASKAP surveys such as full EMU (covering the entire sky < +30 deg in declination) begins operations -- it will result in more findings on the poorly-explored parameter space.
Name: Bhandari, Shivani
E-mail: shivanibhandari58@gmail.com
Affiliation: ASTRON/JIVE
Type of presentation: Poster
Title: The host galaxies and local environments of fast radio bursts
Abstract: Fast Radio Bursts (FRBs) are millisecond-duration transients of intense, coherent radiation that are signposts of extreme astronomical environments. Despite 15 years of research, no conclusive consensus on the progenitor(s) of FRBs has been reached. While it is clear that some FRBs might be produced by magnetars, the diversity of FRB properties, behaviours, and locations implies that this is not the complete answer. Although there has been significant progress in localising FRBs to their hosts, we are still only scratching the surface in terms of the locations in which we can find FRBs. In this talk, I will give an outline of our current understanding of FRB host galaxies and their local surroundings. I will also discuss the latest FRB localisation discoveries from the Australian Square Kilometre Pathfinder.
Name: Maan, Yogesh
E-mail: ymaan@ncra.tifr.res.in
Affiliation: National Centre for Radio Astrophysics (NCRA - TIFR)
Type of presentation: Oral
Title: Identifying the true nature of compact, steep spectrum sources
Abstract: Sensitive all sky imaging surveys have been uncovering interesting new sources, including compact sources with steep spectra that are strong candidates for interesting galactic as well as extra-galactic objects. A good fraction of the steep spectrum sources that are of Galactic origin are expected to be radio pulsars, some of which potentially also as parts of exotic binary systems or surrounded by dense environments. There are also clues adding up to the possibility that some of these sources might constitute a new, earlier unknown Galactic population of sources. Some of the steep spectrum sources might also be 'dead' or remnant radio galaxies, or high-redshift radio galaxies. Identifying the true nature of these compact, steep spectrum sources requires a multitude of observing efforts, often amounting to interferometric characterization at a range of spatial resolution scales as well as radio pulsation searches in the beam-formed data at a wide range of frequencies. I will present characterization of a sizable sample of such sources in the Galactic plane using interferometric observations with the SKA pathfinder GMRT, time-domain searches for radio pulsations covering the frequency range 300 MHz - 5 GHz using multiple telescopes, and very high-resolution probes with the European VLBI Network (EVN). In addition to uncovering interesting exotic sources, such characterization at a larger, population scale will enable efficient searches for interesting sources, such as exotic pulsars and high-redshift galaxies, using samples selected from the imaging surveys in the SKA era.
Name: John Antoniadis
E-mail: john@ia.forth.gr
Affiliation: FORTH Institute of Astrophysics
Type of presentation: Oral
Title: ARGOS: A European "small-D big-N" interferometer for multi-messenger astrophysics
Abstract: I will describe the ARGOS project: A EU-funded initiative to design and deploy a small-D big-N interferometer that will complement and support the science envisioned for next-generation instruments such as the SKA.
Name: Rea, Nanda
E-mail: rea@ice.csic.es
Affiliation: ICE-CSIC
Type of presentation: Oral
Title: Constraining the nature of long period radio pulsars
Abstract: Long period radio pulsars are a new puzzling source class comprising about 4-5 objects, the nature of which is still debated, and possibly not unique. I will report on new multi-band observations and theoretical modelling of the most interesting members of the class, showing how we are getting close to finally constrain their nature.
Name: Law, Casey
E-mail: claw@astro.caltech.edu
Affiliation: Caltech
Type of presentation: Oral
Title: Understanding Fast Radio Burst via their Persistent Radio Countparts
Name: Simon Johnston
E-mail: simon.johnston@csiro.au
Affiliation: CSIRO
Type of presentation: Oral
Title: Pulsar evolution (possibly)
Abstract: How do pulsars evolve with time on the P-Pdot diagram? I'll explain the latest thinking ...
Name: Qiu, Hao(Harry)
E-mail: hao.qiu@skao.int
Affiliation: SKA Observatory
Type of presentation: Poster
Title: Performance of the ASKAP FRB ICS Search Pipeline
Name: Rammala, Isabella
E-mail: irammala@mpifr-bonn.mpg.de
Affiliation: Max-Planck-Institut für Radioastronomie
Type of presentation: Oral
Title: The Discovery & Classification of Compact Sources in the MeerKAT Galactic Centre at L-Band
Abstract: The MeerKAT inaugural image of the Galactic Centre revealed a population of previously unidentified compact sources in the region. Motivated by the efforts to identify radio pulsar candidates in the continuum data, we reprocessed the data to produce high-resolution images and classify the sources based on their spectral properties, as well as the morphological nature of their environment. I will present the classes of the sources discovered and highlight some sources of note.
Name: Gourdji, Kelly
E-mail: kgourdji@swin.edu.au
Affiliation: Swinburne University of Technology
Type of presentation: Oral
Title: LOFAR observations of gravitational wave merger events
Abstract: The main challenge associated with detecting the electromagnetic counterparts of gravitational wave (GW) merger events is the large uncertainty on their locations (10s to 100s of square degrees). I will present how we are utilising LOFAR's large instantaneous field of view and high sensitivity to search for GW merger radio counterparts. In particular, using state-of-the-art data reduction techniques, we construct LOFAR mosaics covering 21 deg^2 with 0.15 mJy rms noise levels at epochs ranging from 1 week to months post-merger. We present our results from LOFAR follow-up observations of three merger events from the previous GW observing run. These constitute the deepest transient search at low radio frequencies on month time timescales. The wide coverage of our observations should probe most of the localisation region of binary neutron star merger events detected in the (upcoming) 4th GW observing run. Finally, I will show how LOFAR 2.0 can be triggered to observe GW events minutes post-merger to probe prompt FRB-like emission at unprecedented sensitivity.
Name: Kylafis, Nick
E-mail: kylafis@physics.uoc.gr
Affiliation: University of Crete & Institute of Astrophysics-FORTH
Type of presentation: Oral
Title: The role of outflows in black-hole X-ray binaries
Abstract: Contrary to the standard picture for black-hole X-ray binaries (BHXRBs), which invokes an accretion flow (hot inner flow and outer accretion disk) and a jet, it is important to stress the importance of the outflow in BHXRBs. Assuming that the outflow is the “corona”, where Compton up-scattering of soft photons from the accretion disk occurs, we have been able to explain over the years a number of observations and correlations, some of which have not been explained in any other way. In particular, the model explains quantitatively 1) the energy spectrum from radio to hard X-rays, 2) the time lag of the hard X-ray photons with respect to the softer ones, 3) the correlation between time lag and Fourier frequency in Cyg X-1 and GX 339-4, 4) the correlation between the time lag and the spectral index Gamma in GX 339-4 and other sources, 5) the fact that this correlation depends on the inclination of the source, 6) the phase-lag – cutoff-energy correlation observed in GX 339-4, 7) the narrowing of the auto-correlation function with increasing photon energy seen in Cyg X-1, 8) the correlation between the Lorentzian frequencies in the power spectrum and the spectral index Gamma in Cyg X-1 and GX 339-4, 9) the B-type QPOs in GX 339-4, and 10) the radio – X-ray correlation in GX 339-4 (unpublished work). All the above observations and correlations are explained with only two parameters: the radius R at the base of the parabolic outflow and the Thomson optical depth \tau along the axis of the outflow. For all the observations and correlations, these two parameters vary in the same narrow ranges: 10 ~< R/R_g ~< 1000 and 1 ~< \tau ~< 10, where R_g is the gravitational radius.
Name: Dimopoulos Dimitrios
E-mail: d@dimokat.gr
Affiliation: National Technological University of Athens (NTUA), National Kapodistrian University of Athens (NKUA)
Type of presentation: None
Title:
Abstract:
Name: Adam Deller
E-mail: adeller@swin.edu.au
Affiliation: Swinburne University of Technology
Type of presentation: Oral
Title: Precision astrometry of impulsive transients
Abstract: I will describe the current approaches for localising millisecond-timescale radio transients, and how this may be improved with future facilities to provide higher-precision localisation.
Name: Koribalski, Baerbel
E-mail: Baerbel.Koribalski@csiro.au
Affiliation: CSIRO ATNF and WSU
Type of presentation: Oral
Title: Odd Radio Circles: possible formation scenarios
Abstract: I will present possible formation scenarios for extragalactic radio rings around massive elliptical galaxies. The rings which have diameters of about 0.5 Mpc, so far remain undetected at non-radio wavelengths. They could be giant radio spheres or shells formed during galaxy mergers, a scenario supported by cosmological simulations. Other scenarios involving powerful transit events are also expored.
In the meantime, we continue searching ASKAP and other wide-field radio continuum images for more odd radio circles, then follow-up promising detections with MeerKAT and other telescopes to help understanding their formation.
Name: Walker, Mark
E-mail: mark.walker@manlyastrophysics.org
Affiliation: Manly Astrophysics
Type of presentation: Oral
Title: A cascade of messages from young pulsars
Abstract: I'll provide a reinterpretation of published radio and multi-messenger data that places pulsars in a supereminent position in the Universe.
Name: Rajwade, Kaustubh
E-mail: rajwade@astron.nl
Affiliation: ASTRON
Type of presentation: Oral
Title: Searching for ultra-long period magnetars with SKA pathfinders
Abstract: Time-domain surveys for pulsars and fast transients continue to discover surprising sources that have shaped our understanding of neutron stars and fast radio bursts (FRBs). Recent discoveries of periodic sources with long rotational periods (P > 30 sec) demonstrate that there is a previously hidden population of such sources lurking in our Galaxy in large numbers. These sources are of great interest due to their implications for the radio emission mechanism in neutron stars and their potential links to the mysterious FRBs. New search techniques are crucial in detecting these sources and SKA pathfinder telescopes like MeerKAT and LOFAR, with their excellent sensitivity, wide field-of-view are the right instruments for the job. In this talk, I will present the recent search efforts and discoveries of ultra-long period neutron stars with these telescope. I will discuss the tools and techniques that have been developed in order to perform this search effectively and efficiently and the relevance of these techniques in the era of next-generation facilities.
Name: Li, Di
E-mail: dili@nao.cas.cn
Affiliation: National Astronomical Observatories, Chinese Academy of Sciences
Type of presentation: Oral
Title: Toward a statistical view of repeating pulses from active FRBs
Abstract: Designed to rival the point-source sensitivity of SKA1 with filled aperture, the FAST telescope has limited field of view, but has been productive in monitoring
active FRBs. FAST has obtained sets of pulses numbered in thousands, for FRB 121102 and FRB 20201124A. FAST has discovered and accumulated hundreds of pulses for FRB 20190520B.
In conjunction with GBT, Parkes, and Effelsberg, our multi-band monitoring efforts are starting to review key characteristics of active FRBs. The lack of RM detection at lower
frequency bands (L-band by FAST, Chime band, etc) can be well explained by RM scatter, for example. These data sets start to quantify repeaters' behaviours with statistical sign
ificance. Combined analysis of the power, pulse shape (drift, etc), polarization, and scattering are building an evolutionary picture for active FRBs.
Name: Surnis, Mayuresh
E-mail: msurnis@gmail.com
Affiliation: JBCA, University of Manchester
Type of presentation: Oral
Title: MeerKAT Localisation of Radio Transients Discovered with MeerTRAP
Abstract: Radio transient searches have traditionally been carried out through observations with single dish telescopes. Radio surveys with interferometers have the
potential to localise the newly discovered transients through high-time resolution imaging. MeerTRAP is a real-time transient search instrument on MeerKAT that operates in a
commensal mode with the large survey projects. This provides a unique way of searching for radio transients through a large amount of on-sky time as well as with repeated
visits for some particular fields. MeerTRAP has the capability of saving data buffers containing the transient event through triggered buffer dumps. These can be used for
offline localisation through interferometric imaging. In this talk, I will describe the localization of some of the transients using the interferometric and the tied-array beam
localisation methods. I will talk about the importance of interferometric localisation for one-off fast radio bursts as well as extremely intermittent radio pulsars. I will
also discuss the importance of radio imaging in providing important input for future surveys with interferometers.
Name: Lower, Marcus
E-mail: marcus.lower@csiro.au
Affiliation: CSIRO
Type of presentation: Oral
Title: Long-term variability of pulsar radio emission and rotational evolution
Abstract: The average pulse profiles of radio pulsars are often assumed to remain constant over time. However, long-term monitoring campaigns over the past few decades have revealed a growing sample of pulsars that exhibit correlated irregularities in their profile shape and spin-down rate. In this talk, I will present the results of a new pulsar variability study using 15-years of observations taken by Murriyang, the Parkes 64-m radio telescope.
Name: Jiwoong Jang
E-mail: jjang@mpifr-bonn.mpg.de
Affiliation: Max-Planck Institute für Radioastronomie
Type of presentation: Oral
Title: Constraining the orbital parameters of PSR J1439-5501 using a first detection of Shapiro delay and scintillation
Abstract: The pulsar-white dwarf binary, J1439-5501, was first discovered in the Parkes Multibeam survey (Faulkner et al. 2004 and Lorimer et al. 2006) in a circular
orbital with a period of 2.12 days. In 2013 Pallanca et al. were able to detect the white dwarf in the optical and constrained the mass range to be 1-1.3 MSun based on white
dwarf cooling models.
This work presents the results of a timing campaign using the MeerKAT telescope combined with the earlier Parkes data. The considerable increase in sensitivity has allowed
the Shapiro delay to be detected for the first time, providing a measurement of the white dwarf mass and inclination angle of the orbit. When combined with the Chandra Shekhar
mass limit, this gives a companion mass of 1.27(+8, -23) Msun, a pulsar mass of 1.57(+22,-47) Msun, and an inclination angle of 77.3(+1,-2) deg.
The strong scintillation seen in the pulsar also allowed the longitude of ascending node and the orientation, velocity and distance to the screen to be measured when combined
with the timing results. The scintillation results also suggest that the distance is 1.0(2) kpc, which is well above the DM derived distance of 603-655 pc (YMW, NE2001), and
at the upper end of the optical estimation of 650-1200 pc.
A measurement of Pbdot would provide a significant improvement in the constraint of the masses in the system. Simulations based on the current timing precision, expected
upgrades to MeerKAT, and eventually using the SKA, suggest that Pbdot should be measurable in approximately 2028.
Name: Kendrick Smith
E-mail: kmsmith@perimeterinstitute.ca
Affiliation: Perimeter Institute for Theoretical Physics
Type of presentation: Oral
Title: Searching for FRBs with CHIME and CHORD
Abstract: I'll give an update on the CHIME FRB search, including both high-level science results and algorithmic/implementation details.
I'll also describe improvements that are in progress for the CHORD FRB search, scheduled to start in 2024.
Name: Marisa Geyer
E-mail: mgeyer@sarao.ac.za
Affiliation: SARAO
Type of presentation: Oral
Title: Characterising the masses in MeerKAT relativistic binaries - a tale of two systems
Abstract: The abstract is a work in progress, but something along these lines:
In this talk I will demonstrate MeerKATs power in extracting accurate mass measurements from two relativistic binary systems, and consider what it teaches us about their evolutionary histories.
Pulsar J0955-6150 is a binary system with a curious past. These days it is found in a highly elongated orbit with a Helium White Dwarf, but how did it get there?
Adding MeerKAT data to decade old Parkes data we improve on the accuracy of the mass measurements of both the pulsar and its White Dwarf companion. While the pulsar mass
is found to be within the anticipated range, the White Dwarf weighs in at an unexpectedly low value … tipping the scale in favour of a new and as of yet unexplored formation path.
The scintillating PSR J1933-6211 too has escaped accurate mass measurements until MeerKAT stepped in. Again combining MeerKAT data with Parkes data, we conduct full polarisation timing;
perform a detailed noise analysis and computed the kinematic contributions to the system’s timing parameters to finally provided clear-cut evidence on the nature of its orbiting companion —
solving the literature mystery of a potentially too-light-to-believe pulsar.
Name: Posselt, Bettina
E-mail: bettina.posselt@physics.ox.ac.uk
Affiliation: University of Oxford
Type of presentation: Oral
Title: Does RX J0806.4-4123 spin up or spin down?
Abstract: The radio-quiet isolated neutron star RX J0806.4-4123 is associated with unique extended near-infrared emission, detected by the Hubble Space Telescope.
One possible explanation for the infrared emission is a surrounding disk made of supernova fallback material. RX J0806.4-4123 is a slowly rotating (P~11s), thermal X-ray source
and a member of the so-called Magnificent Seven (Mag7), a distinct group of neutron stars that are located between the magnetars and rotation-powered radio pulsars in the
period--period-derivative diagram. An accurate timing solution of RX J0806.4-4123 can clarify whether this neutron star is different from its Mag7 siblings. I will present
our multi-year X-ray timing campaign of RX J0806.4-4123 with the NICER instrument and what we can learn from it about the changing spin of this pulsar.
Name: Karastergiou, Aris
E-mail: aris.karastergiou@physics.ox.ac.uk
Affiliation: Oxford
Type of presentation: Oral
Title:
Abstract:
Name: Marta Burgay
E-mail: marta.burgay@inaf.it
Affiliation: INAF - OACagliari
Type of presentation: Oral
Title: Search and timing of pulsars in unidentified Fermi sources with MeerKAT
Abstract: The TRAPUM (Transients and Pulsars with MeerKAT) large survey project, now in its third year of operations, has already discovered more than a hundred pulsars. In this talk I will report on the multi-wavelength timing of 20+ millisecond pulsars found targeting Fermi unidentified point sources. A large fraction of these discoveries are exotic "spider" binary systems with low mass irradiated companion stars, which exhibit a rich phenomenology across the electromagnetic spectrum.
Name: Tarraneh Eftekhari
E-mail: teftekhari@northwestern.edu
Affiliation: Northwestern University
Type of presentation: Oral
Title: Opening a Window into the Transient Millimeter Sky with Next-Generation CMB Surveys
Abstract: The next generation of CMB surveys are poised to open a new window for transient discovery in the millimeter band. These surveys will cover a large fraction of the sky to unprecedented sensitivity and with high cadence, complementing existing and future wide-field radio and optical surveys. Using theoretical and empirical light curves for a wide range of extragalactic transients (including gamma-ray bursts, tidal disruption events, fast blue optical transients, neutron star mergers) in conjunction with known and estimated volumetric event rates, I will present the discovery phase space for millimeter transients in existing and near-term CMB surveys (ACT, SPT-3G, Simons Observatory, CMB-S4, CMB-HD), and discuss the synergy with SKA pathfinders and precursors, leading to a comprehensive view of the transient sky from radio to millimeter wavelengths.
Name: Law, Casey
E-mail: claw@astro.caltech.edu
Affiliation: Caltech
Type of presentation: Oral
Title: FRB Persistent Radio Sources
Abstract: New instruments are making precision localization of Fast Radio Bursts seem easy. Roughly twenty FRBs have been localized well enough to robustly identify host galaxies and search for multiwavelength counterparts. Dozens more are expected as purpose-built instruments come on line, such as DSA-110 and CHIME with outriggers. Yet the even the first localization, FRB 20121102A, has opened an unresolved problem in FRB and extragalactic science: what are persistent radio sources (PRS)? Two compact (<1 pc), luminous (>1e29 erg/s/Hz) radio counterparts have been associated with FRBs. At this luminosity, they are detectable at distances of hundreds of Mpc with all-sky radio surveys. This discovery mirrors theoretical and other observational work that is demonstrating that there are new populations of compact, extragalactic radio sources. I will present a summary of new extragalactic science at the confluence of new theoretical predictions, large radio surveys, and FRB discoveries.
Name: Ray Norris
E-mail: raypnorris@gmail.com
Affiliation: WSU & CSIRO
Type of presentation: Oral
Title: Understanding Odd Radio Circles with ASKAP and Meerkat
Abstract: One of the unexpected discoveries from ASKAP were the Odd Radio Circles (ORCs) which are rings of radio emission, hundreds of kpc in diameter,
surrounding galaxies at high redshifts. We have found ASKAP the premium instrument for finding them, and Meerkat the premium instrument for follow-up observations.
A critical clue to their nature is the compact radio strcutre surrounding the host galaxy.
Name: Main, Robert
E-mail: ramain@mpifr-bonn.mpg.de
Affiliation: Max-Planck-Institut für Radioastronomie
Type of presentation: Oral
Title: Scintillation of pulsars in dense local environments with MeerKAT
Abstract: TBD
Name: Marcote, Benito
E-mail: marcote@jive.eu
Affiliation: Joint Institute for VLBI ERIC (JIVE)
Type of presentation: Oral
Title: Precise localizations of Fast Radio Bursts and their local environments
Abstract:
Name: Evangelia (Lilia) Tremou
E-mail: etremou@nrao.edu
Affiliation: NRAO
Type of presentation: Oral
Title: Dense radio and X-ray monitoring of the black hole X-Ray binary GX339--4
Abstract: I will be presenting the longest-standing and the most dense quasi-simultaneous radio and X-ray monitoring campaign of the low mass X-ray binary GX 339-4, covering three years of weekly radio and X-ray observations with MeerKAT radio telescope and the Swift/XRT, respectively.
Name: Limaye, Pranav
E-mail: s6prlima@uni-bonn.de
Affiliation: Argelander Institute for Astronomy/ Max Planck Institute for Radio Astronomy
Type of presentation: None
Title:
Abstract:
Name: van der Wateren, Emma
E-mail: wateren@astron.nl
Affiliation: ASTRON / Radboud University
Type of presentation: Oral
Title: The LOFAR Tied-Array All-Sky Survey: Timing of 35 radio pulsars and an overview of the LOFAR pulsar properties
Abstract: The LOFAR Tied-Array All-Sky Survey (LOTAAS) is the most sensitive untargeted radio pulsar survey performed at low radio frequencies (119−151 MHz) to date and has discovered 76 new radio pulsars, including the 23.5-s pulsar J0250+5854, which up until recently was the slowest spinning radio pulsar known. In this paper, we report on the timing solutions of 35 pulsars discovered by LOTAAS, which include a nulling pulsar and a mildly recycled pulsar, and thereby complete the full timing analysis of the LOTAAS pulsar discoveries. We give an overview of the findings from the full LOTAAS sample of 76 pulsars, discussing their pulse profiles, radio spectra, and timing parameters. We found that the pulse profiles of some of the pulsars show profile variations in time or frequency, and while some pulsars show signs of scattering, a large majority display no pulse broadening. The LOTAAS discoveries have on average steeper radio spectra and longer spin periods (1.4×), as well as lower spin-down rates (3.1×) compared to the known pulsar population. We discuss the cause of these differences and attribute them to a combination of selection effects of the LOTAAS survey as well as previous pulsar surveys, though we cannot rule out that older pulsars tend to have steeper radio spectra.
Name: Mawson Sammons
E-mail: mawson.sammons@postgrad.curtin.edu.au
Affiliation: Curtin University
Type of presentation: Oral
Title: Two Screen Scattering in CRAFT FRBs
Abstract: Using high spectral and temporal resolution dynamic spectra rendered from baseband data I will present the scintillation and scattering properties of a handful of CRAFT FRBs. This includes several FRBs which show evidence of scattering by more than one screen.
Name: Sachin Pradeep Etakkepravan Thulicheri
E-mail: s6saprad@uni-bonn.de
Affiliation: Argelander-Institut für Astronomie
Type of presentation: None
Title:
Abstract:
Name: Atri, Pikky
E-mail: atri@astron.nl
Affiliation: ASTRON, the Netherlands
Type of presentation: Oral
Title: High-resolution imaging to unearth black hole birth mechanisms
Abstract: Accreting X-ray binaries are excellent laboratories to study extreme physics in our universe and provide unique opportunities to understand exotic neutron stars and black holes. It is thought that black hole X-ray binaries are small-scale Active Galactic Nuclei whose radio jets vary on human timescales. High-resolution radio imaging and astrometry are powerful tools that allow us to directly probe the evolution of these jets. In this talk, I will review the study of compact X-ray binaries and how Very Long Baseline Interferometry is enabling exciting breakthroughs in understanding their birth, evolution and advancing the search for new X-ray binary systems.
Name: Ng, Cherry
E-mail: cherrywyng@gmail.com
Affiliation: LPC2E, CNRS
Type of presentation: None
Title:
Abstract:
Name: Gizani, Nectaria
E-mail: ngizani@eap.gr
Affiliation: Hellenic Open University, School of Science and Technology
Type of presentation: Oral
Title: The Hellenic Radio TelescopeTHERMOpYlae
Abstract: We present the Hellenic radio Telescope: materialization of inspiration, the infrastructure, the scientific importance of the instrument, what has been done so far in spite of issues, update on conversion.
Name: Carli, Emma
E-mail: emma.carli@postgrad.manchester.ac.uk
Affiliation: The University of Manchester
Type of presentation: Oral
Title: Searching for pulsars in Nearby Galaxies with MeerKAT
Abstract: TRAPUM (TRAnsients and PUlsars with MeerKAT, Stappers & Kramer 2016) is a Large Survey Project of the MeerKAT telescope, a 64-dish radio interferometer and precursor to the Square Kilometer Array. The TRAPUM collaboration is conducting a survey of nearby galaxies, which has so far increased the extragalactic radio pulsar population by 50%. I will present the novel observing and processing methods of the survey, harnessing the capabilities of the SKA’s mid-frequency precursor. I will report on the results of the recently completed Small Magellanic Cloud survey, which revealed many young pulsars, the prolific Large Magellanic Cloud survey, and a Fast Radio Burst discovery near the Sextans group of galaxies. Our discoveries can reveal valuable information on Neutron Star formation, Gravitational Waves and Fast Radio Bursts, by effectively probing the effects of another galaxy's properties onto a neutron star population.
Name: Woudt, Patrick
E-mail: pwoudt@ast.uct.ac.za
Affiliation: University of Cape Town
Type of presentation: Oral
Title: Radio transients with MeerKAT: Five years of ThunderKAT and MeerLICHT
Abstract: I will present highlights of five years of ThunderKAT on MeerKAT, and results from the MeerLICHT telescope (abstract to be updated at time of formal registration).
Name: Oleg Smirnov
E-mail: o.smirnov@ru.ac.za
Affiliation: Rhodes University & SARAO
Type of presentation: Oral
Title: MeerKAT as a dynamic imaging machine: Jove, Saturn and the RATT RRAT
Abstract: MeerKAT observations of the Great Saturn-Jupiter Conjunction of 2020 presented a unique dynamic imaging challenge due to the bright and highly time-variable emission from Jupiter's radiation belts (themselves moving relative to background sources). Dynamic imaging of these observations yielded the discovery of a minute-timescale transient as a happy byproduct, which was later confirmed to be an RRAT-type object.
Name: FARHAD ZADEH
E-mail: zadeh@northwestern.edu
Affiliation: Northwestern University
Type of presentation: Oral
Title:
Abstract:
Name: Graber, Vanessa
E-mail: graber@ice.csic.es
Affiliation: Institute of Space Sciences (ICE-Barcelona)
Type of presentation: None
Title:
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Name: Celsa Pardo Araujo
E-mail: pardo@ice.csic.es
Affiliation: Institute of Space Science (ICE-CSIC)
Type of presentation: None
Title:
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Name: Ronchi Michele
E-mail: ronchi@ice.csic.es
Affiliation: Institute of Space Sciences (CSIC-IEEC)
Type of presentation: Oral
Title: Simulation-based inference for pulsar-population synthesis
Abstract: Although about a billion neutron stars are expected to exist in the Milky Way, observational constraints limit us to only observing a few thousand. Pulsar population synthesis bridges this gap by simulating the entire population and comparing it to the observed sample to constrain neutron-star physics. In this talk, we explore the possibility of using simulation-based inference based on neural networks to estimate the parameters governing the magnetic and rotational properties of isolated Galactic radio pulsars. For this purpose, we implement a population-synthesis framework able to simulate the stars' dynamical and magneto-rotational evolution as well as their radio emission and incorporate selection biases of typical radio surveys. We then generate a dataset of mock pulsar populations to train and validate a mixture-density neural network. In particular, we demonstrate how the combined information from P-Pdot diagrams from different radio surveys can help us to recover the posterior distribution of the model parameters governing the properties of neutron stars at birth.
Name: Baan, Willem
E-mail: baan@astron.nl
Affiliation: XinJiang Astronomical Observatory & ASTRON
Type of presentation: Oral
Title: tbd
Abstract: tbd
Name: Driessen, Laura
E-mail: Laura.Driessen@sydney.edu.au
Affiliation: The University of Sydney
Type of presentation: Oral
Title:
Abstract:
Name: Lauren Rhodes
E-mail: lauren.rhodes@physics.ox.ac.uk
Affiliation: Oxford
Type of presentation: Oral
Title: Image plane detections of FRB 121102 and its varying persistent radio counterpart as observed with MeerKAT
Abstract: As more Fast Radio Bursts (FRBs) are being localised, accompanied by persistent radio sources (PRSs), as a community, we need to improve our understanding of the nature of the PRSs, the relation to the bursts themselves as well as determine why only some bursts have PRSs. I will report on observations made of FRB 121102 from the MeerKAT radio telescope. Across five epochs, the persistent radio counterpart associated with FRB 121102, previously reported in the literature, is clearly detected and shown to vary on a timescale of years. I will also present the image plane detections of the bursts previously reported in Caleb et al (2020). Seven of the eleven bursts were detected by imaging the two-second integrations simultaneous to the bursts. Finally, I will discuss the importance of these image plane detections when considering the commensal transient searches being performed with both MeerKAT and other radio facilities.
Name: Oswald, Lucy
E-mail: lucy.oswald@physics.ox.ac.uk
Affiliation: University of Oxford
Type of presentation: Oral
Title: Understanding, explaining and using pulsar polarization
Abstract: The polarization of radio pulsars is a key probe, both of the beam structure and geometry of the pulsars themselves, and of the magnetic structure of the Milky Way. Furthermore, accounting for intrinsic variability and the impact of the interstellar medium is of key importance for accurate pulsar timing. Continued improvements in observational capabilities have shown that the conventional picture of pulsar polarization behaviour is insufficient to explain the complex frequency- and phase-dependent signatures seen in broad-band observations. In this talk I will describe how such observations reveal key relationships between polarization variability, circular polarization and pulsar spin-down energy. I will explain how I developed the partial-coherence model of pulsar polarization to account for these relationships, illustrating this with some straightforward examples of individual and collective pulsar behaviours. I will also explain how we can apply understanding of pulsar polarization to large-scale pulsar surveys to map the structures of the interstellar medium. I will describe this in the context of the Thousand-Pulsar-Array survey on the MeerKAT telescope and look towards future prospects for developing our understanding of both pulsars and the structure of the galaxy with polarization observations in the era of the SKA.
Name: Jankowski, Fabian
E-mail: fabian.jankowski@cnrs-orleans.fr
Affiliation: CNRS Orléans, Université d'Orléans
Type of presentation: Oral
Title: FRBs and pulsars with MeerKAT and the Nançay Radio Observatory telescopes
Abstract: TBD
Name: Keith Bannister
E-mail: keith.bannister@csiro.au
Affiliation: CSIRO
Type of presentation: Oral
Title: CRACO results
Abstract: Rresults from CRACO - hopefully we have some
Name: Guillemot Lucas
E-mail: lucas.guillemot@cnrs-orleans.fr
Affiliation: LPC2E and University of Orléans
Type of presentation: Oral
Title: Towards a much improved polarization calibration scheme for pulsar timing observations with the Nançay Radio Telescope
Abstract: TBD
Name: Blanchard Clara
E-mail: clara.blanchard@cnrs-orleans.fr
Affiliation: LPC2E and University of Orleans
Type of presentation: Oral
Title: Black widow pulsar binaries with the Nançay Radio Telescope
Abstract: TBD
Name: Majid, Wali
E-mail: majidw@gmail.com
Affiliation: JPL, Caltech
Type of presentation: Poster
Title: Joint Radio/Optical Observation of FRBs with Novel DSN Instrument
Abstract: FRBs are bright, milli-second duration radio pulses of unknown origin. Since their discovery in 2007, FRBs have been shown to have extragalactic origins and enormous energy outputs in the radio band alone. Hunting for FRBs and understanding their physical origin(s) have become a leading scientific goal in astrophysics. As neither the progenitors nor their emission mechanisms are known, simultaneous multi-wavelength studies of repeating FRBs would enable new tests of emission models.
In this presentation, we will describe a novel experiment currently under development at the NASA Deep Space Complex in Goldstone, CA, where we are planning on conducting simultaneous long-term radio and optical monitoring of repeating FRBs using a newly developed hybrid radio/optical system. The planned observations with the new facility once the instrument has been commissioned will enable precise measurements of the relative optical to radio energy flux of the bursts, a key observable for discriminating between the various proposed progenitors and emission mechanisms for FRBs.
Name: Venkatraman Krishnan, Vivek
E-mail: vkrishnan@mpifr-bonn.mpg.de
Affiliation: Max Planck Institute for Radio Astronomy, Bonn, Germany
Type of presentation: Oral
Title: The MeerKAT relativistic binary timing programme
Abstract: Timing relativistic binary pulsar systems have enabled the measurements of precise neutron star masses and fundamental tests of gravity in the strong field regime. The measurement of neutron star masses not only provide insight into the elusive neutron star interior, but also help constrain binary evolution theories and supernova physics. For many binary systems in the southern hemisphere, the precision of these measurements have so far been limited by the sensitivity of radio telescopes. The new MeerKAT telescope, a 64-dish interferometer in South Africa that is an SKA-mid precursor, has overcome this limitation with its unparalleled sensitivity in the southern sky. The ongoing "RelBin" observing programme with MeerKAT is a part of the MeerTime large survey project that observes relativistic binary systems. In this talk, I will provide an overview of the RelBin programme and discuss ongoing results from the last 3 years of its operation.
Name: Voraganti Padmanabh, Prajwal
E-mail: prajwal.voraganti.padmanabh@aei.mpg.de
Affiliation: Max Planck Institute for Gravitational Physics, Hannover
Type of presentation: Oral
Title: The MPIfR-MeerKAT Galactic Plane Survey
Abstract: Wide field-of-view interferometric radio surveys covering both imaging and time-domain science are rare. The Max-Planck-Institut f\"{u}r Radioastronomie (MPIfR) MeerKAT Galactic Plane survey (MMGPS) is the only SKA pathfinder survey with such a capability. Covering science cases for pulsars and fast transients, Galactic and extragalactic magnetism and Galactic star formation, the MMGPS is an ongoing commensal survey, that aims to maximise the the scientific return per unit of MeerKAT observing time. In this talk, on behalf of the MMGPS collaboration, I will describe the observing infrastructure, processing strategy and the results obtained across different domains. Observing the Galactic plane at L-band (856-1712 MHz) and S-band (1968 - 2844 MHz) the survey has already yielded more than 75 pulsar discoveries of which 16 are rapidly rotating millisecond pulsars. These include potential double neutron star systems and a binary pulsar also found to have pulsations in Gamma rays. Commensal imaging has been able to produce total intensity images down to a 30 uJy rms and an angular resolution of 7 arcseconds. Additional features planned for the future include a Full Stokes polarisation capability which would further enhance and enable synergistic science between Galactic magnetism and pulsar emission.
Name: Andersson, Alex
E-mail: alexander.andersson@physics.ox.ac.uk
Affiliation: University of Oxford
Type of presentation: Oral
Title: Discovering radio transients using the power of humans and machines
Abstract: The study of radio transients probes an immense range of astrophysical regimes - from flare stars to FRBs - and with the advent of current interferometers we can sample wide swathes of the radio sky with unprecedented sensitivity and cadence. Firstly, I will discuss recent, serendipitous discoveries being made with the MeerKAT radio telescope and how we can make the best of new facilities coming online. This includes how citizen scientists have scoured our data and uncovered 100s of new variable sources - this is the first ever crowd sourcing project dedicated to radio transients in this manner. Secondly, I will discuss novel machine learning techniques being developed to speed up the search for interesting and anomalous sources, methods that will prove invaluable as we look towards observatories such as the SKA.
Name: Kundu, Esha
E-mail: kunduesh@msu.edu
Affiliation: Michigan State University
Type of presentation: Oral
Title: The MAVERIC Survey: Nature of compact objects in globular clusters M22 and M4
Abstract: It is established that globular clusters (GCs) are over-abundant in compact binaries: those containing a white dwarf, neutron star, or black hole (BH). While the existence of some of these classes of objects was known for a long time, the presence of stellar-mass BHs in GCs has only been revealed in the last decade. With the fact that BH-BH binaries are common in the local universe, as indicated by the detection of gravitational waves from the merging events of BH-BH binaries, there are broad scientific implications of the presence of stellar-mass BHs in globular clusters. Through our MAVERIC survey, we have acquired deep radio continuum images of a significant number of Milky Way GCs. I have carried out a detailed study of radio variability along with a multi-wavelength (optical and X-ray) examination of compact objects in GCs M22 and M4 to uncover the true nature of primary accretors. We found there exists a mixed population of compact objects in both globular clusters with at least one new BH candidate in one of these GCs.
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Name: John Reynolds
E-mail: John.Reynolds@csiro.au
Affiliation: CSIRO
Type of presentation: None
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Name: Kazantsev Christine
E-mail: christine.kazantsev@ens-paris-saclay.fr
Affiliation: Institute of Space Sciences, Barcelona, Spain
Type of presentation: Oral
Title: Two new double-neutron-star binary candidates
Abstract: We will discuss two new partially recycled radio pulsars in binary systems. Timing observations carried out with the Arecibo and FAST telescopes over the past several years have led to the measurement of post-keplerian effects. The measured orbital properties of these systems are similar to other known double-neutron-star systems (DNSs) in the Galactic field. Should the neutron-star (NS) nature of the companions be confirmed, our current timing measurements imply that one of the systems contains the lowest-mass NS and one of the most asymmetric DNSs systems known. As for the second system, the spin and orbital properties of the pulsar make for an unusual system and offer a different viewpoint for investigating evolution pathways, recycling processes, pre-supernova properties and supernova kicks in DNSs.
Name: Natasha Hurley-Walker
E-mail: nhw@icrar.org
Affiliation: Curtin University, International Centre for Radio Astronomy Research
Type of presentation: Oral
Title: Long-period transients with the MWA
Abstract: Most known neutron stars have been detected via periodic radio or X-ray signals correlated with their rotational period, which are generated either by a conversion of a fraction of their spin-down dipole radiation (pulsars) or twisting and/or reorganisation of their intense magnetic fields (magnetars). The known population typically rotates with periods of milliseconds to tens of seconds, but it is postulated that there exists an older, much more slowly-rotating neutron star population. These “ultra-long period” (ULP) magnetars are candidate progenitors for Fast Radio Bursts, which themselves are now being localised to positions incompatible with young magnetars (e.g. globular clusters). ULP magnetars would explain many of the emission characteristics of FRBs, such as the quasi-periodic windows of emission, but were thought to be impossible to observe directly.
Using the low-frequency radio telescope the Murchison Widefield Array, we have detected two long-period radio transients, with periods of 18 and 21 minutes, potentially the first direct detections of ULP magnetars. Timing estimates place the sources below the conventional “death lines” of emission mechanisms that explain radio emission in neutron stars. The sources also show surprisingly diverse characteristics, with different pulse morphologies, polarisation behaviour, and staggeringly different activity windows. These sources are just the tip of the iceberg of a new population, the exploration of which will illuminate the behaviour of neutron stars and therefore physics in extreme environments. I will conclude the talk with future survey plans across a range of telescopes.
Name: Anjana Ashok
E-mail: anjana.ashok@aei.mpg.de
Affiliation: Max Planck Institute for Gravitational Physics
Type of presentation: Oral
Title: Targeted searches for continuous gravitational waves from known pulsars
Abstract: A rotating neutron star with a non-axisymmetric distribution of mass continuously emits nearly-monochromatic gravitational waves. These continuous gravitational wave (CW) signals have not been detected yet and searches in Advanced-LIGO data are underway. When a neutron star is observed in electromagnetic waves as a pulsar, the resulting timing solutions can inform the searches for the CW signal from the pulsar. Such targeted searches are the most sensitive among the various types of CW searches. In the event of a non-detection, our constraints on the gravitational wave strain translate to a constraint on the ellipticity - a quantitative measure of the asymmetry of the pulsar. This talk focuses on the methods, some recent results and capabilities of targeted continuous gravitational wave searches.
Name: Jauncey, David
E-mail: david.jauncey@csiro.au
Affiliation: CSIRO Astronomy and Space Sciences
Type of presentation: Oral
Title:
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Name: Wood, Callan
E-mail: callan.m.wood@student.curtin.edu.au
Affiliation: International Centre for Radio Astronomy Research - Curtin University
Type of presentation: Oral
Title: Real-time Imaging of Jets Launched by Accreting Black Holes
Abstract: VLBI observations of X-ray binary jets over the past few decades have uncovered many details about the launching and evolution of jets. By precisely tracking the motions of jets, and thus inferring their ejection date, we can place tight constraints on the physical processes occurring in the accretion inflow that are responsible for the launching of transient jets. In the past, these attempts have been limited by the difficulty of making high-fidelity images of jets that exhibit rapid variability and motion within an observation. In this talk, I will present multiple novel imaging and modelling techniques that explicitly account for intra-observational motion and variability, to track the real-time evolution of jets that are far too faint or fast-moving to be recovered by standard imaging approaches. In one case, in MAXI J1820+070, we were able to place the most precise constraint on the ejection date of a transient XRB jet, by over an order of magnitude, which allowed us to show for the first time that the ejection of jet material was occurring contemporaneously with a change in the spectral and timing properties of the inflowing accretion material. Observations of XRBs with future instruments, like the next generation Event Horizon Telescope (ngEHT), the next generation Very Large Array (ngVLA), and even SKA-VLBI will be able to track the XRB jets earlier in their evolution and for longer, with higher resolution, greater sensitivity and better instantaneous coverage. The use of new imaging and modelling techniques, like the ones we are developing, that can account for the rapid intra-observational variability of jets, will be necessary to make the most of these observations, to get the best constraints of jet launching and evolution.
Name: test1, x
E-mail: test
Affiliation: CSIRO Space & Astronomy
Type of presentation: Poster
Title: TBD
Abstract: TBD
Name: EXARCHOS PANAGIOTIS
E-mail: pexarchos@ote.gr
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