TESS 中温亚土星型行星的偏心率分布
地球与行星天体物理
2025-05-08 v1
摘要
我们基于对 NASA 凌星系外行星巡天卫星 (TESS) 任务凌星光变曲线的分析，给出了温亚土星型行星 (4-8 地球半径，8-200 天周期) 的偏心率分布。我们利用“光偏心”效应约束了 76 颗行星的偏心率，其中 60 颗来自单凌星系统，16 颗来自多凌星系统。我们采用分层贝叶斯建模来推断该行星群的偏心率分布，并测试了 Beta 分布和混合 Beta 分布。我们识别出几颗高偏心率 (e ~ 0.7-0.8) 的温亚土星型行星，其偏心率似乎过高，无法仅用盘迁移或行星-行星散射来解释，这表明高偏心率迁移可能在其形成中发挥了作用。该行星群的平均偏心率为 e = 0.103+0.047-0.045，与行星-盘和行星-行星相互作用一致。值得注意的是，我们发现高偏心率的亚土星型行星出现在单凌星系统中。本研究首次在行星群层面提供了证据，表明亚土星型行星的偏心率可能由动力学过程塑造。
引用
@article{arxiv.2505.04106,
title = {The Eccentricity Distribution of Warm Sub-Saturns in TESS},
author = {Tyler R. Fairnington and Jiayin Dong and Chelsea X. Huang and Emma Nabbie and George Zhou and Duncan Wright and Karen A. Collins and Jon M. Jenkins and David W. Latham and George Ricker and Samuel N. Quinn and Sara Seager and Avi Shporer and Roland Vanderspek and Joshua N. Winn and Calvin Ajizian and Akihiko Fukui and David Baker and Giuseppe Conzo and Robert Scott Fisher and Raquel Forés-Toribio and Tianjun Gan and Alexey Garmash and Kai Ikuta and Adam Lark and Jerome P. de Leon and Katherine Linnenkohl and Christopher R. Mann and Owen Mitchem and Mayuko Mori and Jose A. Muñoz and Norio Narita and Adam Popowicz and Don Radford and Justus Randolph and Fabian Rodriguez Frustaglia and Richard P. Schwarz and Chris Stockdale and Jiaqi Wang and Noriharu Watanabe and Francis P. Wilkin and Krzysztof Sz. Zieliński and Emma Esparza-Borges and Felipe Murgas and Enric Pallé and Hannu Parviainen and Selçuk Yalçınkaya and Özgür Baştürk},
journal= {arXiv preprint arXiv:2505.04106},
year = {2025}
}
备注
Accepted for publication in MNRAS