Possible detection of coronal mass ejections on late-type main-sequence stars in LAMOST medium-resolution spectra | |
Lu, Hong-peng6; Tian, Hui5,6; Zhang, Li-yun4; Karoff, Christoffer2,3; Chen, He-chao6; Shi, Jian-rong5; Hou, Zhen-yong6; Chen, Ya-jie6; Xu, Yu6; Wu, Yu-chuan6 | |
刊名 | ASTRONOMY & ASTROPHYSICS |
2022-07-26 | |
卷号 | 663 |
关键词 | techniques: spectroscopic stars: late-type stars: solar-type stars: activity Sun: coronal mass ejections (CMEs) |
ISSN号 | 0004-6361 |
DOI | 10.1051/0004-6361/202142909 |
产权排序 | 第6完成单位 |
文献子类 | Article |
英文摘要 | Context. Stellar coronal mass ejections (CMEs) are the primary driver of exoplanetary space weather and may affect the habitability of exoplanets. However, detections of possible stellar CME signatures are extremely rare. Aims. This work aims to detect stellar CMEs from time-domain spectra observed through the LAMOST Medium-Resolution Spec-troscopic Survey (LAMOST-MRS). Our sample includes 1 379 408 LAMOST-MRS spectra of 226 194 late-type main-sequence stars (T-eff < 6000 K, log[g/(cm s(-2))] > 4.0). Methods. We first identified stellar CME candidates by examining the asymmetries of H alpha line profiles and then performed double Gaussian fitting for H alpha contrast profiles (differences between the CME spectra and reference spectra) of the CME candidates to analyse the temporal variation in the asymmetric components. Results. Three stellar CME candidates were detected on three M dwarfs. The H alpha and Mg I triplet lines (at 5168.94 angstrom, 5174.13 angstrom, and 5185.10 angstrom) of candidate 1 all exhibit a blue-wing enhancement, and the corresponding Doppler shift of this enhancement shows a gradually increasing trend. The H alpha line also shows an obvious blue-wing enhancement in candidate 2. In candidate 3, the H alpha line shows an obvious red-wing enhancement, and the corresponding projected maximum velocity exceeds the surface escape velocity of the host star. The lower limit of the CME mass is estimated to be similar to 8 x 10(17) g to 4 x 10(18) g for these three candidates. |
学科主题 | 天文学 ; 恒星与银河系 ; 太阳与太阳系 ; 太阳物理学 |
URL标识 | 查看原文 |
出版地 | 17, AVE DU HOGGAR, PA COURTABOEUF, BP 112, F-91944 LES ULIS CEDEX A, FRANCE |
资助项目 | NSFC[12103004] ; NSFC[11825301] ; NSFC[11790304] ; fellowship of China National Postdoctoral Program for Innovative Talents[BX2021017] ; Strategic Priority Research Program of CAS[XDA17040507] ; National Development and Reform Commission |
WOS关键词 | X-RAY FLARE ; EARTH-LIKE EXOPLANETS ; H-ALPHA LINE ; STELLAR FLARE ; TERRESTRIAL EXOPLANETS ; MAGNETIC RECONNECTION ; NONRADIAL PROPAGATION ; CME ACTIVITY ; DWARF FLARE ; T TAURI |
WOS研究方向 | Astronomy & Astrophysics |
语种 | 英语 |
出版者 | EDP SCIENCES S A |
WOS记录号 | WOS:000830127600007 |
资助机构 | NSFC[12103004, 11825301, 11790304] ; fellowship of China National Postdoctoral Program for Innovative Talents[BX2021017] ; Strategic Priority Research Program of CAS[XDA17040507] ; National Development and Reform Commission |
内容类型 | 期刊论文 |
版本 | 出版稿 |
源URL | [http://ir.ynao.ac.cn/handle/114a53/25522] |
专题 | 云南天文台_系外行星研究组 |
通讯作者 | Tian, Hui |
作者单位 | 1.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650216, PR China 2.Department of Geoscience, Aarhus University, Høegh-Guldbergs Gade 2, 8000 Aarhus C, Denmark; 3.Stellar Astrophysics Centre, Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, 8000 Aarhus C, Denmark; 4.College of Physics and Guizhou Provincial Key Laboratory of Public Big Data, Guizhou University, Guiyang 550025, PR China; 5.National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, PR China; 6.School of Earth and Space Sciences, Peking University, Beijing 100871, PR China; |
推荐引用方式 GB/T 7714 | Lu, Hong-peng,Tian, Hui,Zhang, Li-yun,et al. Possible detection of coronal mass ejections on late-type main-sequence stars in LAMOST medium-resolution spectra[J]. ASTRONOMY & ASTROPHYSICS,2022,663. |
APA | Lu, Hong-peng.,Tian, Hui.,Zhang, Li-yun.,Karoff, Christoffer.,Chen, He-chao.,...&Wang, Jiang-tao.(2022).Possible detection of coronal mass ejections on late-type main-sequence stars in LAMOST medium-resolution spectra.ASTRONOMY & ASTROPHYSICS,663. |
MLA | Lu, Hong-peng,et al."Possible detection of coronal mass ejections on late-type main-sequence stars in LAMOST medium-resolution spectra".ASTRONOMY & ASTROPHYSICS 663(2022). |
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