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Magnetic Activity of Ultracool Dwarfs in the LAMOST DR11

文献类型：期刊论文

作者Xiang Y(项越)1,2,4; Gu SH(顾盛宏)1,2,3; Cao DT(曹东涛)1,2,4
刊名ASTROPHYSICAL JOURNAL
出版日期2026-02-01
卷号997期号:2
ISSN号0004-637X
DOI10.3847/1538-4357/ae28d9
产权排序第1完成单位
文献子类Article
英文摘要Ultracool dwarfs consist of lowest-mass stars and brown dwarfs. Their interior is fully convective, in contrast to that of the partly convective Sun-like stars. The magnetic field generation process beneath the surface of ultracool dwarfs is still poorly understood and controversial. To increase samples of active ultracool dwarfs significantly, we have identified 962 ultracool dwarfs in the latest Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) data release, DR11. We also simulate the Chinese Space Station Survey Telescope (CSST) low-resolution slitless spectra by degrading the LAMOST spectra. A semisupervised machine learning approach with an autoencoder model is built to identify ultracool dwarfs with the simulated CSST spectra, which demonstrates the capability of the CSST all-sky slitless spectroscopic survey in the detection of ultracool dwarfs. The magnetic activity of the ultracool dwarfs is investigated by using the H alpha line emission as a proxy. The rotational periods of 82 ultracool dwarfs are derived based on the Kepler/K2 light curves. We also derive the activity-rotation relation of the ultracool dwarfs, which is saturated around a Rossby number of 0.12.
学科主题天文学 ; 恒星与银河系
URL标识查看原文
出版地No.2 The Distillery, Glassfields, Avon Street, Bristol, ENGLAND
WOS关键词ACTIVITY-ROTATION RELATIONSHIP ; LOW-MASS STARS ; MAIN-SEQUENCE ; EVOLUTION ; EMISSION ; PLANETS ; SDSS
资助项目MOST divided by National Natural Science Foundation of China (NSFC)[12288102]
WOS研究方向Astronomy & Astrophysics
语种英语
WOS记录号WOS:001671942000001
出版者IOP Publishing Ltd
资助机构MOST divided by National Natural Science Foundation of China (NSFC)[12288102]
版本出版稿
源URL[http://ir.ynao.ac.cn/handle/114a53/28892]  
专题云南天文台_系外行星研究组
通讯作者Xiang Y(项越); Gu SH(顾盛宏)
作者单位1.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650216, People’s Republic of China;
2.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650216, People’s Republic of China; xy@ynao.ac.cn, shenghonggu@ynao.ac.cn;
3.School of Astronomy and Space Science, University of Chinese Academy of Sciences, Beijing 101408, People’s Republic of China
4.International Centre of Supernovae, Yunnan Key Laboratory, Kunming 650216, People’s Republic of China;
推荐引用方式
GB/T 7714		 Xiang Y,Gu SH,Cao DT. Magnetic Activity of Ultracool Dwarfs in the LAMOST DR11[J]. ASTROPHYSICAL JOURNAL,2026,997(2).
APA 项越,顾盛宏,&曹东涛.(2026).Magnetic Activity of Ultracool Dwarfs in the LAMOST DR11.ASTROPHYSICAL JOURNAL,997(2).
MLA 项越,et al."Magnetic Activity of Ultracool Dwarfs in the LAMOST DR11".ASTROPHYSICAL JOURNAL 997.2(2026).

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来源：云南天文台

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