Simulating the Escaping Atmosphere of GJ 436 b with Two-fluid Magnetohydrodynamic Models

doi:10.1088/1674-4527/ad47de

YNAO OpenIR > 恒星物理研究组

	Simulating the Escaping Atmosphere of GJ 436 b with Two-fluid Magnetohydrodynamic Models
	Xing L(邢磊)1,2,3,4 ; Guo JH(郭建恒)1,2,3,4 ; Yang CY(杨初源)1 ; Yan DD(闫冬冬)1,2,3,4
发表期刊	RESEARCH IN ASTRONOMY AND ASTROPHYSICS
	2024-06-01
卷号	24 期号:6
DOI	10.1088/1674-4527/ad47de
产权排序	第1完成单位
收录类别	SCI
关键词	magnetohydrodynamics (MHD) planets and satellites: atmospheres hydrodynamics
摘要	Observations of transmission spectra reveal that hot Jupiters and Neptunes are likely to possess escaping atmospheres driven by stellar radiation. Numerous models predict that magnetic fields may exert significant influences on the atmospheres of hot planets. Generally, the escaping atmospheres are not entirely ionized, and magnetic fields only directly affect the escape of ionized components within them. Considering the chemical reactions between ionized components and neutral atoms, as well as collision processes, magnetic fields indirectly impact the escape of neutral atoms, thereby influencing the detection signals of planetary atmospheres in transmission spectra. In order to simulate this process, we developed a magnetohydrodynamic multi-fluid model based on MHD code PLUTO. As an initial exploration, we investigated the impact of magnetic fields on the decoupling of H+ and H in the escaping atmosphere of the hot Neptune GJ436b. Due to the strong resonant interactions between H and H+, the coupling between them is tight even if the magnetic field is strong. Of course, alternatively, our work also suggests that merging H and H+ into a single flow can be a reasonable assumption in MHD simulations of escaping atmospheres. However, our simulation results indicate that under the influence of magnetic fields, there are noticeable regional differences in the decoupling of H+ and H. With the increase of magnetic field strength, the degree of decoupling also increases. For heavier particles such as O, the decoupling between O and H+ is more pronounced. Our findings provide important insights for future studies on the decoupling processes of heavy atoms in the escaping atmospheres of hot Jupiters and hot Neptunes under the influence of magnetic fields.
资助项目	Strategic Priority Research Program of Chinese Academy of Sciences[XDB 41000000]; National Natural Science Foundation of China (NSFC)[U2031111]; National Natural Science Foundation of China (NSFC)[12233006]; National Key R&D Program of China[2021YFA1600400/2021YFA1600402]; Natural Science Foundation of Yunnan Province[202201AT070158]; International Centre of Supernovae, Yunnan Key Laboratory[202302AN360001]; Stellar Astrophysics Group at Yunnan Observatories, Chinese Academy of Sciences
项目资助者	Strategic Priority Research Program of Chinese Academy of Sciences[XDB 41000000] ; National Natural Science Foundation of China (NSFC)[U2031111, 12233006] ; National Key R&D Program of China[2021YFA1600400/2021YFA1600402] ; Natural Science Foundation of Yunnan Province[202201AT070158] ; International Centre of Supernovae, Yunnan Key Laboratory[202302AN360001] ; 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
出版者	NATL ASTRONOMICAL OBSERVATORIES, CHIN ACAD SCIENCES
出版地	20A DATUN RD, CHAOYANG, BEIJING, 100101, PEOPLES R CHINA
ISSN	1674-4527
URL	查看原文
WOS记录号	WOS:001249977500001
WOS研究方向	Astronomy & Astrophysics
WOS类目	Astronomy & Astrophysics
关键词[WOS]	LY-ALPHA ; MASS FRACTIONATION ; MAGNETIC-FIELD ; HE 10830 ; ABSORPTION ; HYDROGEN ; EXOSPHERE ; TRANSITS ; PLANETS ; OXYGEN
引用统计
文献类型	期刊论文
版本	出版稿
条目标识符	http://ir.ynao.ac.cn/handle/114a53/27413
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星系类星体研究组
作者单位	1.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650216, China; [email protected]; 2.University of Chinese Academy of Sciences, Beijing 100049, China; 3.Key Laboratory for Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650216, China; 4.International Centre of Supernovae, Yunnan Key Laboratory, Kunming 650216, 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	Xing L,Guo JH,Yang CY,et al. Simulating the Escaping Atmosphere of GJ 436 b with Two-fluid Magnetohydrodynamic Models[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2024,24(6).
APA	邢磊,郭建恒,杨初源,&闫冬冬.(2024).Simulating the Escaping Atmosphere of GJ 436 b with Two-fluid Magnetohydrodynamic Models.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,24(6).
MLA	邢磊,et al."Simulating the Escaping Atmosphere of GJ 436 b with Two-fluid Magnetohydrodynamic Models".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 24.6(2024).

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