TESS 与 Cheops 揭示的两颗凌星暖海王星 HIP 9618
地球与行星天体物理
2023-06-08 v1
摘要
HIP 9618（HD 12572，TOI-1471，TIC 306263608）是一颗明亮的（ mag）类太阳恒星。TESS 测光揭示该恒星拥有两颗候选行星，半径分别为 （HIP 9618 b）和 （HIP 9618 c）。虽然 HIP 9618 b 的 20.77291 天周期被明确测得，但 HIP 9618 c 仅在时间序列中显示出两次相隔 680 天的凌星，使得其周期存在多种可能。为解决此问题，CHEOPS 对周期混叠进行了针对性测光以尝试恢复行星 c 的真实周期，并成功确定其真实周期为 52.56349 天。HARPS-N、SOPHIE 和 CAFE 的高分辨率光谱揭示 HIP 9618 b 的质量为 ，根据我们的内部结构模型，这对应于 的气体比例。HIP 9618 c 的质量似乎低于 HIP 9618 b，其 3 西格玛上限为 。后续和档案视向速度测量还揭示出明显的长期趋势，结合成像和天体测量信息，表明存在一个低质量伴星（）在 au 处轨道运行。该探测使 HIP 9618 成为已知仅有的五颗明亮（ mag）且拥有 d 行星的凌星多行星系统之一，为暖（ K）亚海王星的大气表征打开了大门。
引用
@article{arxiv.2306.04450,
title = {Two Warm Neptunes transiting HIP 9618 revealed by TESS & Cheops},
author = {Hugh P. Osborn and Grzegorz Nowak and Guillaume Hébrard and Thomas Masseron and J. Lillo-Box and Enric Pallé and Anja Bekkelien and Hans-Gustav Florén and Pascal Guterman and Attila E. Simon and V. Adibekyan and Allyson Bieryla and Luca Borsato and Alexis Brandeker and David R. Ciardi and Andrew Collier Cameron and Karen A. Collins and Jo A. Egger and Davide Gandolfi and Matthew J. Hooton and David W. Latham and Monika Lendl and Elisabeth C. Matthews and Amy Tuson and Solène Ulmer-Moll and Andrew Vanderburg and Thomas G. Wilson and Carl Ziegler and Yann Alibert and Roi Alonso and Guillem Anglada and Luc Arnold and Joel Asquier and David Barrado y Navascues and Wolfgang Baumjohann and Thomas Beck and Alexandr A. Belinski and Willy Benz and Federico Biondi and Isabelle Boisse and Xavier Bonfils and Christopher Broeg and Lars A. Buchhave and Tamas Bárczy and S. C. C. Barros and Juan Cabrera and Carlos Cardona Guillen and Ilaria Carleo and Amadeo Castro-González and Sébastien Charnoz and Jessie Christiansen and Pia Cortes-Zuleta and Szilard Csizmadia and Shweta Dalal and Melvyn B. Davies and Magali Deleuil and Xavier Delfosse and Laetitia Delrez and Brice-Olivier Demory and Ava B. Dunlavey and David Ehrenreich and Anders Erikson and Rachel B. Fernandes and Andrea Fortier and Thierry Forveille and Luca Fossati and Malcolm Fridlund and Michaël Gillon and Robert F. Goeke and Maria V. Goliguzova and Erica J. Gonzales and M. N. Günther and Manuel Güdel and Neda Heidari and Christopher E. Henze and Steve Howell and Sergio Hoyer and Jonas Immanuel Frey and Kate G. Isaak and Jon M. Jenkins and Flavien Kiefer and Laszlo Kiss and Judith Korth and Pierre F. L. Maxted and Jacques Laskar and Alain Lecavelier des Etangs and Christophe Lovis and Michael B. Lund and Rafa Luque and Demetrio Magrin and Jose Manuel Almenara and Eder Martioli and Marko Mecina and Jennifer V. Medina and Daniel Moldovan and María Morales-Calderón and Giuseppe Morello and Claire Moutou and Felipe Murgas and Eric L. N. Jensen and Valerio Nascimbeni and Göran Olofsson and Roland Ottensamer and Isabella Pagano and Gisbert Peter and Giampaolo Piotto and Don Pollacco and Didier Queloz and Roberto Ragazzoni and Nicola Rando and Heike Rauer and Ignasi Ribas and George Ricker and Olivier D. S. Demangeon and Alexis M. S. Smith and Nuno Santos and Gaetano Scandariato and Sara Seager and Sergio G. Sousa and Manfred Steller and Gyula M. Szabó and Damien Ségransan and Nicolas Thomas and Stéphane Udry and Bernd Ulmer and Valerie Van Grootel and Roland Vanderspek and Nicholas Walton and Joshua N. Winn},
journal= {arXiv preprint arXiv:2306.04450},
year = {2023}
}
备注
19 pages, 16 figures, 9 tables. Accepted at MNRAS. CHEOPS, RV and ground-based photometric data is available on CDS at https://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/523/3069