Photometric Observations And Study For The Transiting Exoplanetary System WASP-32

The physical parameters of exoplanetary system play extremely important role inunderstanding the formation and evolution of the exoplanetary system. The study forexoplanetary systems provides more samples for understanding our solar system.The photometric observation for the transit event of the exoplanet is one of themost significant methods to obtain the planetary physical parameters. Through theanalysis of the light curve of an exoplanet transit, the radius and the orbital inclinationof the exoplanet can be derived. The mass and other physical parameters of the exo-planet can be inferred through combining the radial velocity data with the transit lightcurve data. These parameters are very important to understand its structure, formationand evolution. Additionally, the transit timing variation(TTV) and transit durationvariation(TDV) of an exoplanet can be taken advantage to probe other unveiled bodiesin the same system.Photometric observations for transit events of WASP-32b were carried out by uti-lizing1-m telescope of Yunnan Observatories and0.5-m telescope of Hokoon NatureEducation cum Astronomical Centre of Hong Kong from2010to2012. The system-atic errors in the photometric data were eliminated with the coarse de-correlation andSYSREM methods so as to enhance the transit feature. Combined with the radial ve-locity data presented in literature, our newly observed data and the earlier photometricdata in the literature are simultaneously analyzed to derive the physical parameters ofthe system by employing the Markov Chain Monte Carlo(MCMC) technique. In com-parison with previous results, our results confirm that WASP-32b’s orbit is circular. Wehave solved the issue that the previous results didn’t agree with each other. Throughthe analysis of all available mid-transit times of symmetric and complete light curves,we have refined the orbital period of WASP-32b, no evident transit timing variation isfound in these transit events.