行星形成的一个极端检验案例：一颗绕极冷恒星的近距海王星
地球与行星天体物理
2023-03-24 v1
摘要
在当前的行星形成理论中，质量如海王星般大的近距轨道行星围绕低质量恒星应当非常罕见。我们报告发现一颗海王星质量行星绕‘极冷’恒星 LHS 3154 运行，该恒星质量比太阳小九倍。该行星轨道周期为3.7天，其最小质量为13.2个地球质量，这使其拥有绕极冷恒星的短周期行星（<$100天）中已知最大的行星-恒星质量比。行星形成的核心吸积和引力不稳定理论都难以解释该系统。特别是在核心吸积情景中，原行星盘中的尘埃质量需要比通常在极冷恒星原行星盘观测中看到的高一个数量级。
引用
@article{arxiv.2303.13321,
title = {An extreme test case for planet formation: a close-in Neptune orbiting an ultracool star},
author = {Gudmundur Stefansson and Suvrath Mahadevan and Yamila Miguel and Paul Robertson and Megan Delamer and Shubham Kanodia and Caleb Cañas and Joshua Winn and Joe Ninan and Ryan Terrien and Rae Holcomb and Eric Ford and Brianna Zawadzki and Brendan P. Bowler and Chad Bender and William Cochran and Scott Diddams and Michael Endl and Connor Fredrick and Samuel Halverson and Fred Hearty and Gary J. Hill and Andrea Lin and Andrew Metcalf and Andrew Monson and Lawrence Ramsey and Arpita Roy and Christian Schwab and Jason Wright and Gregory Zeimann},
journal= {arXiv preprint arXiv:2303.13321},
year = {2023}
}
备注
Original Manuscript as submitted to Science on Oct 17, 2022. In review