一对 transiting 亮K型矮星TOI-1064的亚海王星伴星之CHEOPS表征
地球与行星天体物理
2022-01-19 v1 天体物理仪器与方法
摘要
我们报告了一对 transiting 亮K型矮星TOI-1064(TIC 79748331)的亚海王星伴星的发现与表征，其最初由TESS测光探测到。为表征该系统，我们执行并获取了CHEOPS、TESS与地面测光、HARPS高分辨率光谱以及Gemini散斑成像。我们表征了宿主恒星并确定Teff,⋆=4734±67 K，R⋆=0.726±0.007 R⊙，M⋆=0.748±0.032 M⊙。我们提出了一种基于PSF形状变化建模的新去趋势方法，并证明其适用于校正CHEOPS数据中的流量变化。我们确认了两颗行星体的性质，发现TOI-1064 b轨道周期Pb=6.44387±0.00003 d、半径Rb=2.59±0.04 R⊕、质量Mb=13.5_{-1.8}^{+1.7} M⊕，而TOI-1064 c轨道周期Pc=12.22657^{+0.00005}_{-0.00004} d、半径Rc=2.65±0.04 R⊕、3σ质量上限8.5 M⊕。由高精度测光我们得到约1.6%的半径不确定性，使我们能进行内部结构及大气逃逸建模。TOI-1064 b是密度最大、表征最充分的亚海王星之一，其稀薄大气可由经原行星盘迁移后原始包层损失解释。TOI-1064 c可能因暂定的低密度而具有延展大气，但需进一步视向速度观测以确认此情形及该系统半径相近、质量不同的性质。TOI-1064 b的高精度数据与建模对该质量-半径空间中的行星十分重要，并使我们能识别大质量亚海王星中体密度-恒星金属性的趋势，或暗示该行星族的形成。
引用
@article{arxiv.2201.03570,
title = {A pair of Sub-Neptunes transiting the bright K-dwarf TOI-1064 characterised with CHEOPS},
author = {Thomas G. Wilson and Elisa Goffo and Yann Alibert and Davide Gandolfi and Andrea Bonfanti and Carina M. Persson and Andrew Collier Cameron and Malcolm Fridlund and Luca Fossati and Judith Korth and Willy Benz and Adrien Deline and Hans-Gustav Florén and Pascal Guterman and Vardan Adibekyan and Matthew J. Hooton and Sergio Hoyer and Adrien Leleu and Alexander James Mustill and Sébastien Salmon and Sérgio G. Sousa and Olga Suarez and Lyu Abe and Abdelkrim Agabi and Roi Alonso and Guillem Anglada and Joel Asquier and Tamas Bárczy and David Barrado y Navascues and Susana C. C. Barros and Wolfgang Baumjohann and Mathias Beck and Thomas Beck and Nicolas Billot and Xavier Bonfils and Alexis Brandeker and Christopher Broeg and Edward M. Bryant and Matthew R. Burleigh and Marco Buttu and Juan Cabrera and Sébastien Charnoz and David R. Ciardi and Ryan Cloutier and William D. Cochran and Karen A. Collins and Knicole D. Colón and Nicolas Crouzet and Szilard Csizmadia and Melvyn B. Davies and Magali Deleuil and Laetitia Delrez and Olivier Demangeon and Brice-Olivier Demory and Diana Dragomir and Georgina Dransfield and David Ehrenreich and Anders Erikson and Andrea Fortier and Tianjun Gan and Samuel Gill and Michaël Gillon and Crystal L. Gnilka and Nolan Grieves and Sascha Grziwa and Manuel Güdel and Tristan Guillot and Jonas Haldemann and Kevin Heng and Keith Horne and Steve B. Howell and Kate G. Isaak and Jon M. Jenkins and Eric L. N. Jensen and Laszlo Kiss and Gaia Lacedelli and Kristine Lam and Jacques Laskar and David W. Latham and Alain Lecavelier des Etangs and Monika Lendl and Kathryn V. Lester and Alan M. Levine and John Livingston and Christophe Lovis and Rafael Luque and Demetrio Magrin and Wenceslas Marie-Sainte and Pierre F. L. Maxted and Andrew W. Mayo and Brian McLean and Marko Mecina and Djamel Mékarnia and Valerio Nascimbeni and Louise D. Nielsen and Göran Olofsson and Hugh P. Osborn and Hannah L. M. Osborne and Roland Ottensamer and Isabella Pagano and Enric Pallé and Gisbert Peter and Giampaolo Piotto and Don Pollacco and Didier Queloz and Roberto Ragazzoni and Nicola Rando and Heike Rauer and Seth Redfield and Ignasi Ribas and George R. Ricker and Martin Rieder and Nuno C. Santos and Gaetano Scandariato and François-Xavier Schmider and Richard P. Schwarz and Nicholas J. Scott and Sara Seager and Damien Ségransan and Luisa Maria Serrano and Attila E. Simon and Alexis M. S. Smith and Manfred Steller and Chris Stockdale and Gyula Szabó and Nicolas Thomas and Eric B. Ting and Amaury H. M. J. Triaud and Stéphane Udry and Vincent Van Eylen and Valérie Van Grootel and Roland K. Vanderspek and Valentina Viotto and Nicholas Walton and Joshua N. Winn},
journal= {arXiv preprint arXiv:2201.03570},
year = {2022}
}
备注
30 pages, 24 figures, 6 tables including the Appendix; accepted for publication in MNRAS