Analysis of HAT-P-16b and TrES-3b Exoplanets by the Transit Timing Variations Method

Abstract

In this study, the transit observations of HAT-P-16b and TrES-3b exoplanets were carried out at ÇÜ UZAYMER Observatory with a 50 cm Ritchey Chretien type telescope. By analyzing the light curves of both exoplanets, system parameters have been obtained with acceptable models. Some of these parameters for HAT-P-16 systems were found to be: MP =4.172±0.163 MJ , RP =1.309±0.111 RJ , a/R=7.1922±0.0017 and b=0.1003±0.1533 which are consistent with the values given in Buchhave et al. (2010). Also, for the TrES-3 system, the same parameters were calculated as MP =1.959±0.111 MJ , RP =1.320±0.169 RJ , a/R=6.0656± 0.4899 and b=0.7892±0.0700. These values are also consistent with the values given in O’Donovan et al. (2007). No significant Transit Timing Variations (TTV) was found as a result of the Lomb-Scargle (LS) periodogram for HAT-P-16b by using the transit times obtained from the transit light curves (False Alarm Probabilities – FAP) = %96) . However, a significant periodicity was found at 32.38 days and a secondary periodicity was found at 41.07 days were determined as a result of the LS periodogram obtained from the TrES-3b data. We interpret that these periods with FAP of 3.41 % and 1.88 %, respectively, are close to the rotation period of the host star. Therefore, these periods could be due to the modulation of spot-induced light variations.