Abstrakt
We report the discovery of optical flares on the very low-mass red-dwarf eclipsing binary GJ 3236 and the results of our 2014-2016 photometric campaign. In total, this binary was monitored photometrically in all filters for about 900 h, which has revealed a flare rate of about 0.06 flares per hour.
The amplitude of its flares is the largest among those detected in the V band (similar to 1.3mag), R band (similar to 0.8mag), I band (similar to 0.2mag) and clear band (similar to 0.5 mag). The light curves of GJ 3236 were analysed and the statistics of detected flare events are presented.
The energy released during individual flares was calculated as up to 2.4 x 1027 J and compared with other known active stars. The cumulative distribution of flare energies appears to follow a broken power law.
The flare activity of this binary also plays an important role in the precise determination of its physical parameters and evolutionary status.