中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
首页 机构 成果 学者
  
  1. CAS IR Grid
  2. 云南天文台
  3. 中国科学院云南天文台
  4. 恒星物理研究组
Inversion of Hydrogen-rich Atmosphere and Water Content for GJ 486b

文献类型：期刊论文

作者Zhou JD(周均达)1,2,3; Huang, Zhenyang2,4; Chen, Di-Chang5,6; Guo JH(郭建恒)2,7
刊名ASTROPHYSICAL JOURNAL
出版日期2026-05-10
卷号1002期号:2
ISSN号0004-637X
DOI10.3847/1538-4357/ae5e6c
产权排序第1完成单位
文献子类Article
英文摘要GJ 486b is a close-in planet orbiting an M dwarf and is therefore expected to have undergone strong atmospheric escape. Motivated by theoretical and observational studies on the constraints of its water and atmosphere, we investigate which combinations of a primordial hydrogen-rich atmosphere and water inventory could fit the current water content implied by bulk density measurements. We model the atmosphere escape using VPLanet, following the loss of an initial hydrogen-rich atmosphere and the subsequent escape of a water-dominated atmosphere. By scanning a broad parameter space across different stellar ages, we invert for the initial hydrogen-rich atmospheric mass and water inventory consistent with the current constraints. Our results reveal a strong degeneracy between the water reservoir and the initial hydrogen-rich atmosphere. Even a modest hydrogen-rich atmosphere can significantly delay early escape of the water and reduce the water inventory required to reproduce the current water content. We also find that the inferred initial conditions are also strongly age dependent. Incorporating a planet formation dataset as a prior, we derive a probabilistic constraint on the host star age, yielding an expected age of 2.90-2.27+2.47 Gyr, which is consistent with the results obtained from other methods to determine M dwarf ages.
学科主题天文学 ; 恒星与银河系
URL标识查看原文
出版地No.2 The Distillery, Glassfields, Avon Street, Bristol, ENGLAND
WOS关键词PLANET FORMATION ; ESCAPING ATMOSPHERE ; HYDRODYNAMIC ESCAPE ; MASS FRACTIONATION ; THERMAL EVOLUTION ; STELLAR ; TIME ; AGE ; EXOPLANET ; MODELS
资助项目MOST divided by National Natural Science Foundation of China (NSFC)[12288102]; MOST divided by National Key Research and Development Program of China (NKPs)[2021YFA1600400]
WOS研究方向Astronomy & Astrophysics
语种英语
WOS记录号WOS:001761348200001
出版者IOP Publishing Ltd
资助机构MOST divided by National Natural Science Foundation of China (NSFC)[12288102] ; MOST divided by National Key Research and Development Program of China (NKPs)[2021YFA1600400]
版本出版稿
源URL[http://ir.ynao.ac.cn/handle/114a53/29185]  
专题云南天文台_恒星物理研究组
通讯作者Guo JH(郭建恒)
作者单位1.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650216, People’s Republic of China;
2.University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China; guojh@ynao.ac.cn;
3.International Centre of Supernovae, Yunnan Key Laboratory, Kunming 650216, People’s Republic of China;
4.Xinjiang Astronomical Observatory, Chinese Academy of Sciences, Urumqi 830011, People’s Republic of China;
5.School of Physics and Astronomy, Sun Yat-sen University, Zhuhai, People’s Republic of China;
6.Center of CSST in the Great Bay Area, Sun Yat-sen University, Zhuhai, People’s Republic of China;
7.International Centre of Supernovae (ICESUN), Yunnan Key Laboratory of Supernova Research, Yunnan Observatories, Chinese Academy of Sciences (CAS), Kunming 650216, People’s Republic of China
推荐引用方式
GB/T 7714		 Zhou JD,Huang, Zhenyang,Chen, Di-Chang,et al. Inversion of Hydrogen-rich Atmosphere and Water Content for GJ 486b[J]. ASTROPHYSICAL JOURNAL,2026,1002(2).
APA 周均达,Huang, Zhenyang,Chen, Di-Chang,&郭建恒.(2026).Inversion of Hydrogen-rich Atmosphere and Water Content for GJ 486b.ASTROPHYSICAL JOURNAL,1002(2).
MLA 周均达,et al."Inversion of Hydrogen-rich Atmosphere and Water Content for GJ 486b".ASTROPHYSICAL JOURNAL 1002.2(2026).

入库方式： OAI收割

来源：云南天文台

浏览0
下载0
收藏0
其他版本

除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。