Radio emission from flaring stars and brown dwarfs
K. Perger, B. Seli, K. Vida

TL;DR
This study investigates radio emissions from a large sample of brown dwarfs and flaring stars, finding radio counterparts only in flaring stars, and reveals correlations with stellar parameters and age, suggesting a common synchrotron origin.
Contribution
It provides the first extensive analysis linking radio emissions to stellar parameters, age, and activity in flaring stars, with no radio detection in brown dwarfs.
Findings
55 flaring stars have radio counterparts
Radio powers correlate with surface gravity, radius, and mass
Most radio-detected stars are younger than 150 Myr
Abstract
Aims. With the aim to reveal the effects of the magnetic field to the multi-band activity of dwarf stars, we search for associated radio emission for an extensive list of 14 915 brown dwarfs and 15 124 flaring stars. Methods. We utilised the first and second epoch catalogues and radio maps from all three epochs of the VLASS, supplemented with X-ray catalogues based on observations by the ROSAT, eROSITA, and XMM-Newton space telescopes, and 2-minute cadence optical light curves from the TESS mission. The radio-detected sub-sample was queried for concurrent TESS observations, and sources with coinciding light-curves were studied individually. Results. We found no associated radio emission for brown dwarfs, and found 55 radio counterparts for the sample of flaring stars, out of which seven have coincident TESS observations. The radio-detected sample follows both the radio-X-ray and the…
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