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

doi:10.1088/1674-4527/ad47de

	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)4; Yan DD(闫冬冬)1,2,3,4
刊名	RESEARCH IN ASTRONOMY AND ASTROPHYSICS
	2024-06-01
卷号	24 期号:6
关键词	magnetohydrodynamics (MHD) planets and satellites: atmospheres hydrodynamics
ISSN号	1674-4527
DOI	10.1088/1674-4527/ad47de
产权排序	第1完成单位
文献子类	Article
英文摘要	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.
学科主题	天文学 ; 恒星与银河系
URL标识	查看原文
出版地	20A DATUN RD, CHAOYANG, BEIJING, 100101, PEOPLES R CHINA
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
WOS关键词	LY-ALPHA ; MASS FRACTIONATION ; MAGNETIC-FIELD ; HE 10830 ; ABSORPTION ; HYDROGEN ; EXOSPHERE ; TRANSITS ; PLANETS ; OXYGEN
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	NATL ASTRONOMICAL OBSERVATORIES, CHIN ACAD SCIENCES
WOS记录号	WOS:001249977500001
资助机构	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
内容类型	期刊论文
版本	出版稿
源URL	[http://ir.ynao.ac.cn/handle/114a53/27413]
专题	云南天文台_恒星物理研究组
作者单位	1.International Centre of Supernovae, Yunnan Key Laboratory, Kunming 650216, China 2.Key Laboratory for Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650216, China; 3.University of Chinese Academy of Sciences, Beijing 100049, China; 4.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650216, China; guojh@ynao.ac.cn;
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).