系外行星研究组知识库

在2012至2014年期间,用云南天文台1 m望远镜对HAT-P-36系外行星系统的3次凌食事件进行了测光观测。用IRAF软件包对CCD测光图像进行处理,用coarse de-correlation和SYSREM方法对数据中的系统误差进行改正,最后用MCMC方法求解HAT-P-36行星系统的物理参数。新得到的行星质量比Mancini等人和Bakos等人的计算结果略微偏大。基于20组凌食事件的中心时刻数据,用最小二乘法对其进行拟合,得到更加精确的行星轨道周期(1.327 347 04±0.000 000 27)d,从O–C图中可以看出线性关系并不能很好地拟合数据点,但是功率谱分析没有发现明显的周期性信号,在此假设HAT-P-36b的轨道外存在一颗微扰行星并限定它的一些物理参数。

We use the 1-meter telescope of Yunnan Observatories and observed three transit events of HAT-P-36 from 2012 to 2014. We correct the data for systematic errors based on coarse de-correlation and SYSREM algorithms. Three new transit light curves are analyzed by means of the Markov chain Monte Carlo technique. The value of planet mass acquired in this paper is slightly larger than the results of Mancini and Bakos. Through the analysis of all available mid-transit times of symmetric and complete light curves, I refine the ephemeris of HAT-P-36b, which is better than former ones. Via the O-C analysis, I find that this system exists significant transit timing variations. But the Lomb-Scargle periodogram generated for timing residuals show no significant signal. Therefore, I speculate that there is an external perturbing planet and hence this paper also gives some physical parameters' range of this perturbing planet.