A Stellar Flare during the Transit of the Extrasolar Planet OGLE-TR-10b
Samuel Bentley, Coel Hellier, Pierre Maxted, Vik Dhillon, Tom Marsh,, Chris Copperwheat, Stuart Littlefair
TL;DR
This paper reports the first observation of a stellar flare during an exoplanet transit, highlighting its impact on transit measurements and suggesting stellar activity may influence exoplanet characterization.
Contribution
It documents a stellar flare during OGLE-TR-10b's transit, emphasizing the importance of accounting for stellar activity in exoplanet studies.
Findings
Flares can reduce observed transit depth in certain bands.
OGLE-TR-10a exhibits high stellar activity and X-ray luminosity.
Flares may lead to inaccurate planetary parameter estimates.
Abstract
We report a stellar flare occurring during a transit of the exoplanet OGLE-TR-10b, an event not previously reported in the literature. This reduces the observed transit depth, particularly in the u'-band, but flaring could also be significant in other bands and could lead to incorrect planetary parameters. We suggest that OGLE-TR-10a is an active planet-hosting star and has an unusually high X-ray luminosity.
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