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Characterization of the regimes of hydrodynamic escape from low-mass exoplanets

文献类型：期刊论文

作者Guo JH(郭建恒)1,2,3
刊名NATURE ASTRONOMY
出版日期2024
ISSN号2397-3366
DOI10.1038/s41550-024-02269-w
产权排序第1完成单位
文献子类Article; Early Access
英文摘要Atmospheric hydrodynamic escape sculpts the population of low-mass close-in planets. However, distinguishing between the driving mechanisms responsible for the hydrodynamic escape of hydrogen-rich atmospheres is a complex task due to the involvement of many physical factors. Using simulations, I show that hydrodynamic escape can be driven solely by thermal energy deposited in the lower layers of the atmosphere, but only if the planet's Jeans parameter is below 3. Otherwise, additional exogenous drivers are necessary. To characterize these drivers, an upgraded Jeans parameter that takes into account tidal forces is introduced. When the upgraded Jeans parameter falls below 3 or exceeds 6, atmospheric escape is primarily driven by tidal forces or extreme ultraviolet radiation from the host star, respectively. In the range 3 to 6, both factors can trigger the escape of the atmosphere. The upgraded Jeans parameter, which is closely related to the underlying physics, provides a concise method for categorizing the driving mechanisms of hydrodynamic escape. The results can also be applied to planetary evolution calculations. An updated Jeans parameter that includes tidal forces can distinguish the various driving forces, both exogenous and endogenous, of atmospheric escape from low-mass close-in exoplanets. Depending on its value, escape can be dominated by tidal forces, extreme ultraviolet stellar radiation or a combination of the two.
学科主题天文学 ; 恒星与银河系
URL标识查看原文
出版地HEIDELBERGER PLATZ 3, BERLIN, 14197, GERMANY
WOS关键词UPPER-ATMOSPHERE ; X-RAY ; HYDROGEN ; PHOTOCHEMISTRY ; ABSORPTION ; RADIATION ; AERONOMY ; N-2
资助项目This work is Supported by National Natural Science Foundation of China (Nos. 12288102) and the Strategic Priority Research Program of Chinese Academy of Sciences, Grant No. XDB 41000000. I also acknowledge the support by the National Natural Science Founda[11973082]; National Natural Science Foundation of China[XDB 41000000]; Strategic Priority Research Program of the Chinese Academy of Sciences[2021YFA1600400/2021YFA1600402]; National Key R&D Program of China; Stellar Astrophysics Group at Yunnan Observatories, Chinese Academy of Sciences
WOS研究方向Astronomy & Astrophysics
语种英语
WOS记录号WOS:001220723800001
出版者NATURE PORTFOLIO
资助机构This work is Supported by National Natural Science Foundation of China (Nos. 12288102) and the Strategic Priority Research Program of Chinese Academy of Sciences, Grant No. XDB 41000000. I also acknowledge the support by the National Natural Science Founda[11973082] ; National Natural Science Foundation of China[XDB 41000000] ; Strategic Priority Research Program of the Chinese Academy of Sciences[2021YFA1600400/2021YFA1600402] ; National Key R&D Program of China ; Stellar Astrophysics Group at Yunnan Observatories, Chinese Academy of Sciences
版本出版稿
源URL[http://ir.ynao.ac.cn/handle/114a53/27197]  
专题云南天文台_恒星物理研究组
云南天文台_中国科学院天体结构与演化重点实验室
作者单位1.Key Laboratory for the Structure and Evolution of Celestial Objects, CAS, Kunming, China
2.University of Chinese Academy of Sciences, Beijing, China;
3.Yunnan Observatories, Chinese Academy of Sciences, Kunming, China;
推荐引用方式
GB/T 7714		 Guo JH. Characterization of the regimes of hydrodynamic escape from low-mass exoplanets[J]. NATURE ASTRONOMY,2024.
APA 郭建恒.(2024).Characterization of the regimes of hydrodynamic escape from low-mass exoplanets.NATURE ASTRONOMY.
MLA 郭建恒."Characterization of the regimes of hydrodynamic escape from low-mass exoplanets".NATURE ASTRONOMY (2024).

入库方式： OAI收割

来源：云南天文台

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