中文摘要：

使用紫金山天文台盱眙观测站近地天体望远镜对WASP-43b和TrES-3b分别做了2次和4次凌星主食的测光后续观测．经过较差测光和光变曲线拟合，分别得到了两个系统的相关物理参数，结果与之前的文献结果吻合．结合多篇文献中的数据，对两个系统凌星中心时刻的观测残差O—C分别作了线性和二次函数拟合，根据线性拟合得到了行星的轨道周期及凌星中心时刻变化即TTV，分析后认为在两个系统中尚未发现明显的周期性TTV信号，并给出了WASP-43和nES-3系统中1：2轨道共振位置上可能存在行星的质量上限分别为1．826和1．504个地球质量．通过二次函数拟合，尚未发现TrES-3b存在长期TTV即轨道衰变；证认了WASP-43b可能存在轨道衰变，得到其轨道衰变率P=（-0．005248±0．001714）s·yr^-1，并与文献中的相关结果做了比较，还据此计算出了该系统的恒星潮汐质量参数下限为Q′＊》1．5×10^5，并分别对两个系统中不同的Q′＊值给出了相应的行星剩余寿命．

英文摘要：

TWO photometric follow-up observations for transiting primary eclipse of WASP-43 b and four for TrES-3 b are performed using the Xuyi Near-Earth Object Survey Telescope. After differential photometry and light curve analysis, physical pa- rameters of the two systems are obtained and are in good match with the literatures. Combining with transit data from many literatures, the residuals （O - C） of observa- tions of both systems transits are fitted with the linear and quadratic terms. With the linear fitting, the periods and transit timing variations （TTVs） of the planets are ob- tained, and no obvious periodic TTV signal is found in either system after analysis. The maximum mass of perturbing planet located at 1：2 mean motion resonance （MMR） of WASP-43 b and TrES-3 b are estimated to be 1.826 and 1.504 Earth mass, respectively. By quadratic fitting, it is confirmed that WASP-43 b may have long-term TTV which means an orbital decay. The decay rate is shown to be/5 __ （-0.005248 ：h 0.001714） s.yr-1, and is compared with the previous results. Based on this, the lower limit of the stellar tidal quality parameter of WASP-43 is calculated to be Q′＊ 〉 1.5×10^5, and the remaining lifetime of the planets of both systems is presented for different Q′＊. values accordingly.