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23rd of April 2021
A flare from Proxima Centauri
by MacGregor et al.
MacGregor et al. have reported the discovery of an extreme flaring event from the star Proxima Centauri by the Australian Square Kilometre Array Pathfinder (ASKAP), Atacama Large Millimeter/submillimeter Array (ALMA), Hubble Space Telescope (HST), Transiting Exoplanet Survey Satellite (TESS), and the du Pont Telescope. In the millimeter and far-ultraviolet bands, this flare is the brightest ever detected, brightening by a factor of >1000 and >14,000 as seen by ALMA and HST, respectively.

The ASKAP observations show faint, ∼ 50% circularly-polarized emission throughout the entire 14-hour observation, including a slowly-declining flux component that is not seen on any other day of the campaign. But no radio burst counterpart was detected by ASKAP. This apparent lack of correlation between low-frequency (< 1 GHz) and higher frequency activity is commonly observed from active M-dwarf stars, and may indicate that the physical driver for low-frequency activity is independent of the processes driving flaring activity observed in higher-frequency wavebands The results of the study were reported this week in The Astrophysical Journal Letters. (Image credit: S. Dagnello, NRAO/AUI/NSF)

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