Unmasking hidden planets and false positives: the curious case of NGTS-3Ab
Monday 2 July, 12:45
I will highlight an innovative candidate vetting approach which unmasked the hidden NGTS-3Ab, a hot Jupiter transiting the primary star in an unresolved binary system. Without this novel, thorough analysis, the signal would have been either miss-classified or erroneously disregarded. Such systems can only be identified through the conjoint analysis of multi-colour photometry, centroiding, radial velocity (RV) cross-correlation functions (CCFs) and their bisectors in a Bayesian framework. The scientific merit of transit surveys is limited by these hidden systems: blended eclipsing binaries mimic shallow exoplanet transits, while constant blends lead to underestimation of planets' radii. With TESS on the horizon, it is pivotal to consider all possible follow-up information from multi-colour photometry, centroiding and RV CCF profiles.