Flare activity on low-mass eclipsing binary GJ 3236

Abstract 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 p...

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Bibliographic Details
Published in:Monthly notices of the Royal Astronomical Society 2017-04, Vol.466 (3), p.2542-2546
Main Authors: Šmelcer, L., Wolf, M., Kučáková, H., Bílek, F., Dubovský, P., Hoňková, K., Vraštil, J.
Format: Article
Language:English
Subjects:
Astronomy
Binary stars
Double stars
Dwarf stars
Eclipsing binary stars
Evolution
Flares
Monitoring
Optics
Photometry
Physical properties
Statistics
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Summary:Abstract 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 (∼1.3 mag), R band (∼0.8 mag), I band (∼0.2 mag) and clear band (∼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 × 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.
ISSN:0035-8711
1365-2966
DOI:10.1093/mnras/stw3179