TESS 与 CHEOPS 发现两颗凌亮 K 型矮星 HD 15906 的温暖亚海王星
地球与行星天体物理
2023-06-08 v1
摘要
我们报告发现两颗温暖亚海王星凌亮（G = 9.5 mag）K 型矮星 HD 15906（TOI 461，TIC 4646810）。该星由凌星系外行星巡天卫星（TESS）在第 4 和第 31 扇区观测，揭示两颗小型凌星行星。内行星 HD 15906 b 以明确周期被探测到，而外行星 HD 15906 c 仅显示两次相隔约 734 天的凌星，导致其周期有 36 种可能值。我们利用表征系外行星卫星（CHEOPS）进行跟进观测，以确认 HD 15906 c 的真实周期并提升两行星半径精度。根据 TESS、CHEOPS 及额外地基测光，我们发现 HD 15906 b 半径为 2.24 ± 0.08 R_⊕、周期为 10.924709 ± 0.000032 天，而 HD 15906 c 半径为 2.93^{+0.07}_{-0.06} R_⊕、周期为 21.583298^{+0.000052}_{-0.000055} 天。假设零邦德反照率与完全昼夜热重分布，内、外行星平衡温度分别为 668 ± 13 K 与 532 ± 10 K。HD 15906 系统已成为仅有的六个含两颗温暖（≲ 700 K）亚海王星尺寸行星凌亮星（G ≤ 10 mag）的多行星系统之一。它是详细表征研究以约束亚海王星成分并检验行星形成与演化理论的极佳目标。
引用
@article{arxiv.2306.04511,
title = {TESS and CHEOPS Discover Two Warm Sub-Neptunes Transiting the Bright K-dwarf HD 15906},
author = {Amy Tuson and Didier Queloz and Hugh P. Osborn and Thomas G. Wilson and Matthew J. Hooton and Mathias Beck and Monika Lendl and Göran Olofsson and Andrea Fortier and Andrea Bonfanti and Alexis Brandeker and Lars A. Buchhave and Andrew Collier Cameron and David R. Ciardi and Karen A. Collins and Davide Gandolfi and Zoltan Garai and Steven Giacalone and João Gomes da Silva and Steve B. Howell and Jayshil A. Patel and Carina M. Persson and Luisa M. Serrano and Sérgio G. Sousa and Solène Ulmer-Moll and Andrew Vanderburg and Carl Ziegler and Yann Alibert and Roi Alonso and Guillem Anglada and Tamas Bárczy and David Barrado Navascues and Susana C. C. Barros and Wolfgang Baumjohann and Thomas Beck and Willy Benz and Nicolas Billot and Xavier Bonfils and Luca Borsato and Christopher Broeg and Juan Cabrera and Sébastien Charnoz and Dennis M. Conti and Szilard Csizmadia and Patricio E. Cubillos and Melvyn B. Davies and Magali Deleuil and Laetitia Delrez and Olivier D. S. Demangeon and Brice-Olivier Demory and Diana Dragomir and Courtney D. Dressing and David Ehrenreich and Anders Erikson and Zahra Essack and Jacopo Farinato and Luca Fossati and Malcolm Fridlund and Elise Furlan and Holden Gill and Michaël Gillon and Crystal L. Gnilka and Erica Gonzales and Manuel Güdel and Maximilian N. Günther and Sergio Hoyer and Kate G. Isaak and Jon M. Jenkins and Laszlo L. Kiss and Jacques Laskar and David W. Latham and Nicholas Law and Alain Lecavelier des Etangs and Gaspare Lo Curto and Christophe Lovis and Rafael Luque and Demetrio Magrin and Andrew W. Mann and Pierre F. L. Maxted and Michel Mayor and Scott McDermott and Marko Mecina and Christoph Mordasini and Annelies Mortier and Valerio Nascimbeni and Roland Ottensamer and Isabella Pagano and Enric Pallé and Gisbert Peter and Giampaolo Piotto and Don Pollacco and Tyler Pritchard and Roberto Ragazzoni and Nicola Rando and Francesco Ratti and Heike Rauer and Ignasi Ribas and George R. Ricker and Martin Rieder and Nuno C. Santos and Arjun B. Savel and Gaetano Scandariato and Richard P. Schwarz and Sara Seager and Damien Ségransan and Avi Shporer and Attila E. Simon and Alexis M. S. Smith and Manfred Steller and Chris Stockdale and Gyula M. Szabó and Nicolas Thomas and Guillermo Torres and René Tronsgaard and Stéphane Udry and Bernd Ulmer and Valérie Van Grootel and Roland Vanderspek and Julia Venturini and Nicholas A. Walton and Joshua N. Winn and Bill Wohler},
journal= {arXiv preprint arXiv:2306.04511},
year = {2023}
}
备注
30 pages, 20 figures, 11 tables (including appendix). Published in MNRAS