The physical parameters of alien solar systems are very important for understanding the formation and evolution of planetary systems, Even for our solar system by providing more comparable and referenced samples of planetary systems. The photometric observations of transiting events of exoplanets is one of the most important ways to derive the planetary parameters. From the transiting light curves of exoplanets, the radius of an exoplanet and the orbtial inclination can be inferred. Combining with radial velocity data, the mass also can be derived. The density of exoplanet derived from the size and mass of exoplanet is the key data for understanding its formation and evolution. Furtherly, the transit timing variation(TTV) and transit duration variation(TDV) of an exoplanet can be used to dectect other undiscovered exoplanets in the planetary system. Photometric follow-up observations for transiting exoplanetary system HAT-P-8 were made by using 1m telescope in Kunming and 2.4m telescope in Lijiang of Yunnan Observatory. The observational data were reduced by IRAF software, and systematic errors were corrected with the Collier Cameron's coarse de-correlation and Tamuz' SYSREM algorithms in order to obtain high ratio of signal to noise of the transit feature. The MCMC(Markov Chain Monte Carlo) technique was applied to analyze all transit light curves simultaneously, and the new parameters of HAT-P-8 system were derived. Also the TTV signals of this system were analysed.
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