通过凌星中心时刻变化研究热木星起源

人们已经发现了4000多颗系外行星，但对行星系统性质的了解仍然处于初级阶段，精确刻画行星系统性质，变成了越来越迫切的需求。其中，热木星因与太阳系木星的巨大差异引起了业界注意，其起源之谜是该领域一大热点难点。关于热木星的起源，国际上有盘迁移和高偏心率迁移两种主流学说。而分辨这两种学说的关键之一，在于能否在热木星周围找到近邻行星的存在。本项目采用的凌星中心时刻变化方法能极其敏锐的捕捉到近邻行星的存在。本项目的样本包括我们过去地基望远镜监测的80个源和现在TESS望远镜所包含的热木星系统，这将是针对热木星凌星中心时刻变化分析的最大样本。本项目将对整个样本进行系统参数的优化和近邻行星生成率的统计，最终分辨热木星的两种迁移方式。

Though more than 4000 exoplanets have been found, people almost know nothing about them. It is more and more important to characterize the known planetary systems in detail. Under the circumstances, the hot Jupiters have tightly caught our attention because they are so different from our Jupiter. The enigmatic origin of hot Jupiters is definitely a hot and difficult point in this field. There are two competing mechanisms to explain hot Jupiters' origin, the disk migration and high eccentricity migration. Whether there is a nearby companion to the known hot Jupiter is a key to distinguish the two mechanisms. The Transit Timing Variation method we adopted is sensitive in searching nearby companions. This work will includes 80 hot Jupiters we monitored before and the ones observed by TESS recently. It will be the largest hot Jupiter sample ever since for Transit Timing Variation analysis. In this work, we will refine the system parameters and statistics the occurrence rate of nearby companions for the whole sample, and thus to distinguish the two competing migration mechanisms.