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9th of April 2018
The binary millisecond pulsar PSR J2322−2650 -- part 1
Spiewak et al. have reported the discovery of a binary millisecond pulsar (MSP), PSR J2322−2650. The pulsar was found in the Southern section of the High Time Resolution Universe survey undertaken with the Parkes 64m radiotelescope. The binary system contains a 3.5-ms pulsar with a planetary mass companion in a 7.75-hour circular orbit.

The figure above shows the integrated pulse profile from summed observations (equivalent integration time of 50,000 seconds) with linear (red dashed line) and circular (blue dash-dotted line) polarizations. The intrinsic period derivative of PSR J2322−2650 is among the lowest known, implying a low surface magnetic field strength of 4 × 10^7 G. Its mean radio flux density of 160 µJy combined with the distance implies that its radio luminosity is the lowest ever measured. The inferred population of these systems in the Galaxy may be very significant, suggesting that this is a common MSP evolutionary path.

These results are presented in the paper published in Monthly Notices of the Royal Astronomical Society.

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