Transit Timing Variations Analysis in Exoplanet Host-Stars

PETRUCCI, R.; JOFRÉ, E.; FERRERO, L; CÚNEO, V; SAKER, L; GOMEZ, M.; MAUAS, P.; ARTUR, E; SCHWARTZ, M

Moscow

Simposio; The 40th COSPAR Scientific Assembly; 2014

In a system composed only by a star and a transiting planet, it should be expected that the interval between successive minima be constant. However, if there is a third body in the system, periodic variations of this interval are expected. Therefore, it should be possible to detect other planetary-mass bodies around stars with an already known transiting planet.The less massive the perturber, the smaller the amplitudes of the timing variations, and the higher precision minimum central times (with errors of around seconds) are required. In addition, as it has been shown in several studies (e.g. Southworth et al. 2012; Nascimbeni et al. 2013), for TTVs analysis it is of crucial relevance to perform the same fitting procedure and error treatment in the studied transits. In this work we present a complete and homogeneous study of TTVs of WASP-4b and WASP-28b, carried out with argentinian telescopes.