Physical Properties of the Transiting Planetary System TrES-3

الأصل · EN

We present four new transits of the planetary system TrES-3 observed between 2009 May and 2010 June. Among these, the third transit by itself indicates possible evidence for brightness disturbance, which might be the result of the planet blocking a cool starspot on the stellar surface. A total of 109 transit times, including our measurements, were used to determine the improved ephemeris with a transit epoch of 2454185.910944±0.000072 HJED and an orbital period of 1.30618700±0.00000015 d. We analyzed the transit light curves using the JKTEBOP code and adopting the quadratic limb-darkening law. In order to derive the physical properties of the TrES-3 system, the transit parameters are combined with the empirical relations from eclipsing binary stars and stellar evolutionary models. The stellar mass and radius obtained from a calibration using Tₐ, log ρ A and [Fe/H] are consistent with those from the isochrone analysis. We found that the exoplanet TrES-3b has a mass of 1.93±0.07 M Jup, a radius of 1.30±0.04 R Jup, a surface gravity of log g b=3.45±0.02, a density of 0.82±0.06 ρ Jup, and an equilibrium temperature of 1641±23 K. The results are in good agreement with theoretical models for gas giant planets.