The evolution of hot Jupiters revealed by the age distribution of their host stars
Huang, Yang; Dong, Subo; Luo, A. -Li; Zhu, Zi; Zhu, Wei; Liu, Chao; Wang, Hai-Feng; Zhou, Ji-Lin; Zheng, Zheng; Chen, Di-Chang; Xie, Ji-Wei; Xiang, Mao-Sheng; Yang, Jia-Yi; Zhang, Jing-Hua
China, United States, Italy
Abstract
Hot Jupiters are the first exoplanet population discovered around main-sequence stars. However, their origin and evolution remain puzzled. Using a sample with kinematic properties derived from large surveys (e.g., Gaia, LAMOST), we characterize the kinematic ages of stars hosting hot and warm/cold Jupiters, confirming the result of the previous study that hot Jupiter hosts are younger using a relative proxy. Furthermore, we find that as stars age, the frequency of hot Jupiters declines but that of warm/cold Jupiters does not vary. Such trends are expected from tidal decays of hot Jupiters' orbits. Our derived relations can help explain the long-standing discrepancy between hot Jupiter frequencies from RV and transit surveys and the null detection of hot Jupiters in globular clusters.