K2-111：一个含两颗近共振行星的年老系统
地球与行星天体物理
2020-12-22 v2
摘要
本文报道基于 K2、WASP 与 ASAS-SN 测光以及 HARPS-N 和 ESPRESSO 高分辨率光谱数据对 K2-111 行星系统的详细表征。宿主星 K2-111 被确认为一颗温和演化的（）、贫铁（[Fe/H]）、但 α 增强（[/Fe]）、色球宁静的极年老厚盘 G2 型恒星。使用 PyORBIT 进行的全局拟合表明，凌星行星 K2-111b 以周期 d 轨道运行，其行星半径为 R、质量为 M，体密度略低于地球。恒星化学组成与行星性质一致表明 K2-111b 是一颗铁核质量分数低于地球的类地行星。我们宣布在径向速度数据中存在第二个信号，并将其归因为一颗非凌星行星 K2-111c，其轨道周期为 天，与凌星行星处于近 3:1 平运动共振，最小行星质量为 M。两个行星信号在分别拟合时均于 HARPS-N 与 ESPRESSO 数据中独立探测到。该共振系统中可能还有更多行星，但需更充分采样的数据以确认其存在与物理参数。
引用
@article{arxiv.2010.01993,
title = {K2-111: an old system with two planets in near-resonance},
author = {A. Mortier and M. R. Zapatero Osorio and L. Malavolta and Y. Alibert and K. Rice and J. Lillo-Box and A. Vanderburg and M. Oshagh and L. Buchhave and V. Adibekyan and E. Delgado Mena and M. Lopez-Morales and D. Charbonneau and S. G. Sousa and C. Lovis and L. Affer and C. Allende Prieto and S. C. C. Barros and S. Benatti and A. S. Bonomo and W. Boschin and F. Bouchy and A. Cabral and A. Collier Cameron and R. Cosentino and S. Cristiani and O. D. S. Demangeon and P. Di Marcantonio and V. D'Odorico and X. Dumusque and D. Ehrenreich and P. Figueira and A. Fiorenzano and A. Ghedina and J. I. González Hernández and J. Haldemann and A. Harutyunyan and R. D. Haywood and D. W. Latham and B. Lavie and G. Lo Curto and J. Maldonado and A. Manescau and C. J. A. P. Martins and M. Mayor and D. Mégevand and A. Mehner and G. Micela and P. Molaro and E. Molinari and N. J. Nunes and F. A. Pepe and E. Palle and D. Phillips and G. Piotto and M. Pinamonti and E. Poretti and M. Riva and R. Rebolo and N. C. Santos and D. Sasselov and A. Sozzetti and A. Suárez Mascareño and S. Udry and R. G. West and C. A. Watson and T. G. Wilson},
journal= {arXiv preprint arXiv:2010.01993},
year = {2020}
}
备注
Accepted for publication in MNRAS on 28 Sept 2020. Paper is 18 pages with an additional 12 pages of supplementary material. Data is available at https://vizier.u-strasbg.fr/viz-bin/VizieR?-source=J/MNRAS/499/5004