Astrophysical false positives in exoplanet transit surveys: why do we need bright stars ?

SANTERNE, A.; DÍAZ, R. F.; ALMENARA, J.-M.; LETHUILLIER, A.; DELEUIL, M.; MOUTOU, C.

Montpellier

Jornada; Semaine de l'Astrophysique Française 2013; 2013

Astrophysical false positives that mimic planetary transit are one ofthe main limitation to exoplanet transit surveys. In this proceeding, wereview the issue of the false positive in transit survey and thepossible complementary observations to constrain their presence. We alsoreview the false-positive rate of both Kepler and CoRoT missions andpresent the basics of the planet-validation technique. Finally, wediscuss the interest of observing bright stars, as PLATO 2.0 and TESSwill do, in the context of the false positives. According to simulationswith the Besançon galactic model, we find that PLATO 2.0 isexpected to have less background false positives than Kepler, and thusan even lower false-positive rate.