How stellar activity affects the size estimates of extrasolar planets

摘要: Light curves have long been used to study stellar activity and more recently become a major tool in the field of exoplanet research. We discuss various ways which can influence transit light curves, effects using outstanding photometric data CoRoT-2 system. report relation between “global” curve profiles, turn out be shallower during high spot coverage on surface. Furthermore, our analysis reveals color dependence compatible with wavelength-dependent limb darkening law as observed Sun. Taking into account activity-related effects, we redetermine orbit inclination planetary radius find planet ≈3% larger than reported previously. Our findings also show that research cannot generally ignore activity.