Photometric Follow-up Observations And Study For The Transiting Exoplanetary System HAT-P-8

The physical parameters of alien solar systems are very important for un-derstanding the formation and evolution of planetary systems, Even for our solarsystem by providing more comparable and referenced samples of planetary sys-tems.The photometric observations of transiting events of exoplanets is one of themost important ways to derive the planetary parameters. From the transitinglight curves of exoplanets, the radius of an exoplanet and the orbtial inclinationcan be inferred. Combining with radial velocity data, the mass also can bederived. The density of exoplanet derived from the size and mass of exoplanet isthe key data for understanding its formation and evolution. Furtherly, the transittiming variation(TTV) and transit duration variation(TDV) of an exoplanet canbe used to dectect other undiscovered exoplanets in the planetary system.Photometric follow-up observations for transiting exoplanetary system HAT-P-8were made by using1m telescope in Kunming and2.4m telescope in Lijiangof Yunnan Observatory. The observational data were reduced by IRAF soft-ware, and systematic errors were corrected with the Collier Cameron’s coarsede-correlation and Tamuz’ SYSREM algorithms in order to obtain high ratio ofsignal to noise of the transit feature. The MCMC(Markov Chain Monte Carlo)technique was applied to analyze all transit light curves simultaneously, and thenew parameters of HAT-P-8system were derived. Also the TTV signals of thissystem were analysed.