Possible detection of coronal mass ejections on late-type main-sequence stars in LAMOST medium-resolution spectra
文献类型：期刊论文
| 作者 | Lu, Hong-peng1; Tian, Hui1,2; Zhang, Li-yun3,4; Karoff, Christoffer5,6; Chen, He-chao1; Shi, Jian-rong2; Hou, Zhen-yong1; Chen, Ya-jie1; Xu, Yu1; Wu, Yu-chuan1 |
| 刊名 | ASTRONOMY & ASTROPHYSICS
 |
| 出版日期 | 2022-07-26 |
| 卷号 | 663页码:14 |
| 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 |
| 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. |
| 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 |
| 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研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000830127600007 |
| 出版者 | EDP SCIENCES S A |
| 资助机构 | NSFC ; NSFC ; fellowship of China National Postdoctoral Program for Innovative Talents ; fellowship of China National Postdoctoral Program for Innovative Talents ; Strategic Priority Research Program of CAS ; Strategic Priority Research Program of CAS ; National Development and Reform Commission ; National Development and Reform Commission ; NSFC ; NSFC ; fellowship of China National Postdoctoral Program for Innovative Talents ; fellowship of China National Postdoctoral Program for Innovative Talents ; Strategic Priority Research Program of CAS ; Strategic Priority Research Program of CAS ; National Development and Reform Commission ; National Development and Reform Commission ; NSFC ; NSFC ; fellowship of China National Postdoctoral Program for Innovative Talents ; fellowship of China National Postdoctoral Program for Innovative Talents ; Strategic Priority Research Program of CAS ; Strategic Priority Research Program of CAS ; National Development and Reform Commission ; National Development and Reform Commission ; NSFC ; NSFC ; fellowship of China National Postdoctoral Program for Innovative Talents ; fellowship of China National Postdoctoral Program for Innovative Talents ; Strategic Priority Research Program of CAS ; Strategic Priority Research Program of CAS ; National Development and Reform Commission ; National Development and Reform Commission |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/87765]  |
| 专题 | 中国科学院国家天文台 |
| 通讯作者 | Tian, Hui |
| 作者单位 | 1.Peking Univ, Sch Earth & Space Sci, Beijing 100871, Peoples R China 2.Chinese Acad Sci, Natl Astron Observ, Beijing 100101, Peoples R China 3.Guizhou Univ, Coll Phys, Guiyang 550025, Peoples R China 4.Guizhou Univ, Guizhou Prov Key Lab Publ Big Data, Guiyang 550025, Peoples R China 5.Aarhus Univ, Stellar Astrophys Ctr, Dept Phys & Astron, Ny Munkegade 120, DK-8000 Aarhus C, Denmark 6.Aarhus Univ, Dept Geosci, Hoegh Guldbergs Gade 2, DK-8000 Aarhus C, Denmark 7.Chinese Acad Sci, Yunnan Observ, Kunming 650216, Yunnan, Peoples R 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,2022,663:14. |
| 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,663,14. |
| 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):14. |
入库方式： OAI收割
来源：国家天文台
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