TESS发现的 two 颗年龄介于20-320 Myr的场星周围的年轻行星系统
地球与行星天体物理
2020-12-09 v1 太阳与恒星天体物理
摘要
年轻恒星周围的行星揭示了行星系统的早期演化。我们报告了利用凌星系外行星巡天卫星（TESS）的观测发现并验证的两个年龄 Myr的行星系统。TOI-251是一颗40-320 Myr岁的G型星，宿主一颗半径为 2.74 +0.18/-0.18 REarth 的迷你海王星，周期4.94天。TOI-942是一颗20-160 Myr岁的K型星，宿主一个膨胀的海王星大小行星系统，其中TOI-942b周期4.32天、半径 4.81 +0.20/-0.20 REarth，TOI-942c周期10.16天、半径 5.79 +0.19/-0.18 REarth。尽管我们无法将任一颗宿主星归入已知的恒星协会或星团，但可通过其测光与光谱性质估计其年龄。两颗星均因黑子调制表现出显著测光变率，测得自转周期约 天。这些恒星还表现出显著的色球活动，由色球钙发射线与X射线通量得出的年龄估计与由陀螺年代学估计的一致。两颗星亦呈现显著的锂吸收，其等值宽度与特征明确的年轻星团成员相似。TESS有潜力交付一群承载行星的年轻场星，为追踪行星性质随年龄的变化作出重要贡献。
引用
@article{arxiv.2011.13349,
title = {Two young planetary systems around field stars with ages between 20-320 Myr from TESS},
author = {George Zhou and Samuel N. Quinn and Jonathan Irwin and Chelsea X. Huang and Karen A. Collins and Luke G. Bouma and Lamisha Khan and Anaka Landrigan and Andrew M. Vanderburg and Joseph E. Rodriguez and David W. Latham and Guillermo Torres and Stephanie T. Douglas and Allyson Bieryla and Gilbert A. Esquerdo and Perry Berlind and Michael L. Calkins and Lars A. Buchhave and David Charbonneau and Kevin I. Collins and John F. Kielkopf and Eric L. N. Jensen and Thiam-Guan Tan and Rhodes Hart and Brad Carter and Christopher Stockdale and Carl Ziegler and Nicholas Law and Andrew W. Mann and Steve B. Howell and Rachel A. Matson and Nicholas J. Scott and Elise Furlan and Russel J. White and Coel Hellier and David R. Anderson and Richard G. West and George Ricker and Roland Vanderspek and Sara Seager and Jon M. Jenkins and Joshua N. Winn and Ismael Mireles and Pamela Rowden and Daniel A. Yahalomi and Bill Wohler and Clara. E. Brasseur and Tansu Daylan and Knicole D. Coloń},
journal= {arXiv preprint arXiv:2011.13349},
year = {2020}
}
备注
Accepted for publication in AJ