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

doi:10.1038/s41550-024-02269-w

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	Characterization of the regimes of hydrodynamic escape from low-mass exoplanets
	Guo JH(郭建恒)1,2,3
发表期刊	NATURE ASTRONOMY
	2024
DOI	10.1038/s41550-024-02269-w
产权排序	第1完成单位
收录类别	SCI
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.
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
项目资助者	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
语种	英语
学科领域	天文学 ; 恒星与银河系
文章类型	Article; Early Access
出版者	NATURE PORTFOLIO
出版地	HEIDELBERGER PLATZ 3, BERLIN, 14197, GERMANY
ISSN	2397-3366
URL	查看原文
WOS记录号	WOS:001220723800001
WOS研究方向	Astronomy & Astrophysics
WOS类目	Astronomy & Astrophysics
关键词[WOS]	UPPER-ATMOSPHERE ; X-RAY ; HYDROGEN ; PHOTOCHEMISTRY ; ABSORPTION ; RADIATION ; AERONOMY ; N-2
引用统计	被引频次：2[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
版本	出版稿
条目标识符	http://ir.ynao.ac.cn/handle/114a53/27197
专题	恒星物理研究组中国科学院天体结构与演化重点实验室
作者单位	1.Yunnan Observatories, Chinese Academy of Sciences, Kunming, China; 2.University of Chinese Academy of Sciences, Beijing, China; 3.Key Laboratory for the Structure and Evolution of Celestial Objects, CAS, Kunming, China
第一作者单位	中国科学院云南天文台
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).

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