TESS-Keck巡天第六篇：HIP-97166周围两颗偏心亚海王星
地球与行星天体物理
2021-12-08 v1
摘要
我们报告发现HIP-97166b（TOI-1255b），一颗绕距地球68 pc的K0型矮星运行、轨道周期10.3天的凌星亚海王星。该行星是在对TESS感兴趣目标（TESS Objects of Interest）中基于观测凌星时长与圆轨道预期时长不匹配而系统性搜寻偏心轨道行星时识别出的。我们通过地基视向速度测量确认了HIP-97166b的行星性质，并测得质量 20 2 M_\bigoplus以及由测光得到的半径 2.7 0.1 R_\bigoplus。我们探测到一颗额外的非凌星行星伴星，其 sin 10 2 M_\bigoplus，位于16.8天轨道上。尽管内行星较短的凌星时长最初暗示高偏心率，联合RV-测光分析揭示出高碰撞参数和中等偏心率。以系统在未来10轨道内保持稳定的条件建模动力学，得到偏心率约束和。我们发现的行星b的偏心率在具有精确测量偏心率的少量亚海王星群体中高于平均。我们探讨了该系统的可能形成路径，提出早期不稳定与合并事件以解释内行星的高密度（5.3 0.9 g/cc）及其中等偏心率和接近5:3平运动共振。
引用
@article{arxiv.2110.05628,
title = {The TESS-Keck Survey. VI. Two Eccentric sub-Neptunes Orbiting HIP-97166},
author = {Mason G. MacDougall and Erik A. Petigura and Isabel Angelo and Jack Lubin and Natalie M. Batalha and Corey Beard and Aida Behmard and Sarah Blunt and Casey Brinkman and Ashley Chontos and Ian J. M. Crossfield and Fei Dai and Paul A. Dalba and Courtney Dressing and Benjamin Fulton and Steven Giacalone and Michelle L. Hill and Andrew W. Howard and Daniel Huber and Howard Isaacson and Stephen R. Kane and Andrew Mayo and Teo Močnik and Joseph M. Akana Murphy and Alex Polanski and Malena Rice and Paul Robertson and Lee J. Rosenthal and Arpita Roy and Ryan A. Rubenzahl and Nicholas Scarsdale and Emma Turtelboom and Judah Van Zandt and Lauren M. Weiss and Elisabeth Matthews and Jon M. Jenkins and David W. Latham and George R. Ricker and S. Seager and Roland K. Vanderspek and Joshua N. Winn and C. E. Brasseur and John Doty and Michael Fausnaugh and Natalia Guerrero and Chris Henze and Michael B. Lund and Avi Shporer},
journal= {arXiv preprint arXiv:2110.05628},
year = {2021}
}
备注
Accepted at The Astronomical Journal; 15 pages, 10 figures