利用CHEOPS精确表征HD 15337：行星形成与演化的实验室
地球与行星天体物理
2024-06-26 v1
摘要
我们旨在利用新的凌星测光和视向速度数据，约束HD 15337 b和c的内部结构与成分，这两颗短周期行星位于半径谷的两侧。我们获取了6次新的CHaracterising ExOPlanet Satellite（CHEOPS）凌星观测和32次新的High Accuracy Radial Velocity Planet Searcher（HARPS）视向速度测量，以提高两颗行星质量和半径估计的精度。我们重新分析了TESS第3和第4扇区的光变曲线，并分析了第30扇区的新数据，对长期恒星活动进行了校正。随后，我们对TESS和CHEOPS光变曲线以及所有来自HARPS和Planet Finder Spectrograph（PFS）的可用视向速度数据进行联合拟合。我们的模型同时拟合了行星信号、恒星活动信号以及CHEOPS数据的仪器去相关模型。恒星活动通过对视向速度和活动指标进行高斯过程回归来建模。我们最后采用贝叶斯反演代码来确定行星的内部成分和结构。我们推导出了HD 15337系统更新且高精度的参数。行星参数精度的提高使HD 15337 b成为表征最精确的岩石系外行星之一，其半径和质量测量的精度分别优于2%和7%。我们将HD 15337 c的半径测量精度提高到了3%。我们的结果表明，HD 15337 b的成分主要为岩石，而HD 15337 c则表现出一个质量至少为的气体包层。我们的结果为未来研究奠定了基础，这些研究可以进一步揭示这些系外行星的大气演化，并为它们的成分、形成历史以及半径间隙的成因提供新的见解。
引用
@article{arxiv.2403.16621,
title = {Precise characterisation of HD 15337 with CHEOPS: a laboratory for planet formation and evolution},
author = {N. M. Rosário and O. D. S. Demangeon and S. C. C. Barros and D. Gandolfi and J. A. Egger and L. M. Serrano and H. P. Osborn and M. Beck and W. Benz and H. -G. Florén and P. Guterman and T. G. Wilson and Y. Alibert and L. Fossati and M. J. Hooton and L. Delrez and N. C. Santos and S. G. Sousa and A. Bonfanti and S. Salmon and V. Adibekyan and A. Nigioni and J. Venturini and R. Alonso and G. Anglada and J. Asquier and T. Bárczy and D. Barrado Navascues and O. Barragán and W. Baumjohann and T. Beck and N. Billot and F. Biondi and X. Bonfils and L. Borsato and A. Brandeker and C. Broeg and V. Cessa and S. Charnoz and A. Collier Cameron and Sz. Csizmadia and P. E. Cubillos and M. B. Davies and M. Deleuil and A. Deline and B. -O. Demory and D. Ehrenreich and A. Erikson and M. Esposito and A. Fortier and M. Fridlund and M. Gillon and M. Güdel and M. N. Günther and Ch. Helling and S. Hoyer and K. G. Isaak and L. L. Kiss and K. W. F. Lam and J. Laskar and A. Lecavelier des Etangs and M. Lendl and A. Luntzer and D. Magrin and P. F. L. Maxted and C. Mordasini and V. Nascimbeni and G. Olofsson and H. L. M. Osborne and R. Ottensamer and I. Pagano and E. Pallé and G. Peter and G. Piotto and D. Pollacco and D. Queloz and R. Ragazzoni and N. Rando and H. Rauer and I. Ribas and G. Scandariato and D. Ségransan and A. E. Simon and A. M. S. Smith and M. Stalport and Gy. M. Szabó and N. Thomas and S. Udry and V. Van Eylen and V. Van Grootel and E. Villaver and I. Walter and N. A. Walton},
journal= {arXiv preprint arXiv:2403.16621},
year = {2024}
}
备注
17 pages, including appendix