四行星系统中13小时周期类地行星的低偏心率迁移路径
地球与行星天体物理
2022-06-10 v1
摘要
人们普遍接受轨道周期短于1天的系外行星（即超短周期（USP）行星）在其原生原行星盘中形成于更外侧，随后通过动力学相互作用迁移至当前轨道。最受认可的理论之一提出了一种涉及高偏心率迁移随后潮汐圆化的剧烈情景。在此，我们报告发现围绕明亮（V=10.5）K6矮星TOI-500运行的四行星系统。最内侧行星是一颗凌星、地球大小的USP行星，轨道周期约13小时，质量1.42 0.18 M，半径 R，平均密度4.89 gcm。通过多普勒光谱，我们发现该系统宿主三颗近圆轨道的外行星，周期分别为6.6、26.2和61.3天，最小质量分别为5.03 0.41 M、33.12 0.88 M和15.05 M。USP行星与6.6天轨道上低质量天体同时存在表明，该系统的架构可通过以下情景解释：行星始于低偏心率轨道，然后通过准静态长期迁移向内移动。我们的数值模拟表明，该迁移通道可在20亿年内将TOI-500 b从0.02au的初始轨道带到当前位置。TOI-500是已知首个宿主USP类地行星的四行星系统，其当前架构可通过非剧烈迁移情景解释。
引用
@article{arxiv.2204.13573,
title = {A low-eccentricity migration pathway for a 13-h-period Earth analogue in a four-planet system},
author = {Luisa Maria Serrano and Davide Gandolfi and Alexander J. Mustill and Oscar Barragán and Judith Korth and Fei Dai and Seth Redfield and Malcolm Fridlund and Kristine W. F. Lam and Matías R. Díaz and Sascha Grziwa and Karen A. Collins and John H. Livingston and William D. Cochran and Coel Hellier and Salvatore E. Bellomo and Trifon Trifonov and Florian Rodler and Javier Alarcon and Jon M. Jenkins and David W. Latham and George Ricker and Sara Seager and Roland Vanderspeck and Joshua N. Winn and Simon Albrecht and Kevin I. Collins and Szilárd Csizmadia and Tansu Daylan and Hans J. Deeg and Massimiliano Esposito and Michael Fausnaugh and Iskra Georgieva and Elisa Goffo and Eike Guenther and Artie P. Hatzes and Steve B. Howell and Eric L. N. Jensen and Rafael Luque and Andrew W. Mann and Felipe Murgas and Hannah L. M. Osborne and Enric Palle and Carina M. Persson and Pam Rowden and Alexander Rudat and Alexis M. S. Smith and Joseph D. Twicken and Vincent Van Eylen and Carl Ziegler},
journal= {arXiv preprint arXiv:2204.13573},
year = {2022}
}
备注
Published on Nature Astronomy (April 28th, 2022)