Abstract
We report the results of the transit timing variation analysis of the exoplanet TrES-3b, using thirty seven light curves which cover more than thousand epochs. Our analysis combines thirty two previously available transit light curves with five new transits, which were observed between May 2010 and June 2010 with the 0.81-m telescope at Tenagra Observatory, Arizona, US. From these observational data, the orbital parameters of the TrES-3 system are determined and the possible transit timing variations are investigated. Our results suggest that the assumption with no transit timing variations provides poor fit to the observations minus calculations, i.e., (O-C), data. To explain the observational results, we find that the possible dynamical models are those with one additional planet with order of hundred Earth-Mass located near but not exactly at 1:2 exterior resonance to TrES-3b.