Magellan-TESS 巡天 I：巡天描述与中期结果
地球与行星天体物理
2021-10-04 v2 太阳与恒星天体物理
摘要
揭示约三分之一的类太阳恒星拥有轨道周期在 100 天以内、大小介于地球与海王星之间的行星。这些行星如何形成、由什么构成，它们代表一个连续种群还是多个种群？为帮助解答这些问题，我们启动了 Magellan-TESS 巡天（MTS），利用 Magellan II/PFS 获取 30 颗 TESS 探测到的系外行星的径向速度（RV）质量，并开发一个将观测到的行星分布与潜在种群相联系的分析框架。过去，由于宿主恒星暗弱和 RV 半振幅低，小型行星的 RV 测量难以获取；且由于目标选择和观测规划决策中潜在的偏差，其解释也具挑战性。MTS 通过聚焦明亮的 TESS 目标并采用定量选择函数与观测策略，试图最小化这些偏差。在本文中，我们（1）描述研究动机与巡天策略，（2）呈现针对 27 个 TESS 兴趣对象（TOIs；其中 22 个在我们的种群分析样本中，12 个属于同一系统）的行星密度约束首份星表，以及（3）采用层次贝叶斯模型对质量-半径（M-R）关系给出初步约束。我们发现，导致先前 M-R 关系在 处预测相当高质量的那些偏差已被减弱。本工作可为单系统的更细致研究提供参考，并提供一个可应用于未来 RV 巡天以进行种群推断的框架。
引用
@article{arxiv.2011.11560,
title = {The Magellan-TESS Survey I: Survey Description and Mid-Survey Results},
author = {Johanna Teske and Sharon Xuesong Wang and Angie Wolfgang and Tianjun Gan and Mykhaylo Plotnykov and David J. Armstrong and R. Paul Butler and Bryson Cale and Jeffrey D. Crane and Ward Howard and Eric L. N. Jensen and Nicholas Law and Stephen A. Shectman and Peter Plavchan and Diana Valencia and Andrew Vanderburg and George Ricker and Roland Vanderspek and Dave W. Latham and Sara Seager and Joshua W. Winn and Jon M. Jenkins and Vardan Adibekyan and David Barrado and Susana C. C. Barros and Zouhair Benkhaldoun and David J. A. Brown and Edward M. Bryant and Jennifer Burt and Douglas A. Caldwell and David Charbonneau and Ryan Cloutier and Karen A. Collins and Kevin I. Collins and Nicole D. Colon and Dennis M. Conti and Olivier D. S. Demangeon and Jason D. Eastman and Mohammed Elmufti and Fabo Feng and Erin Flowers and Natalia M. Guerrero and Saeed Hojjatpanah and Jonathan M. Irwin and Giovanni Isopi and Jorge Lillo-Box and Franco Mallia and Bob Massey and Mayuko Mori and Susan E. Mullally and Norio Narita and Taku Nishiumi and Ares Osborn and Martin Paegert and Jerome Pitogo de Leon and Samuel N. Quinn and Michael Reefe and Richard P. Schwarz and Avi Shporer and Abderahmane Soubkiou and Sérgio G. Sousa and Chris Stockdale and Paul A. Strøm and Thiam-Guan Tan and Peter Tenenbaum and Peter J. Wheatley and Justin Wittrock and Daniel A. Yahalomi and Farzaneh Zohrabi},
journal= {arXiv preprint arXiv:2011.11560},
year = {2021}
}
备注
Minor updates to some masses, and new exploration of broken power law M-R relation. 66 pages (now some figures moved to figure sets, will be in HTML published version). Accepted to ApJS on June 22, 2021