Flare Hunting in Hot Subdwarf and White Dwarf Stars from Cycles 1-5 of TESS Photometry

doi:10.3847/1538-4365/ad2ddd

	Flare Hunting in Hot Subdwarf and White Dwarf Stars from Cycles 1-5 of TESS Photometry
	Xing, Keyu 9,10,11; Zong, Weikai 9,10,11; Silvotti, Roberto 8; Fu, Jian-Ning 10,11; Charpinet, Stéphane 7; Cang, Tianqi 9,10,11; Hermes, J. J.6; Ma, Xiao-Yu 10,11; Wang, Haotian 10,11; Wang, Xuan 10,11
刊名	ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
	2024-04-01
卷号	271 期号:2
ISSN号	0067-0049
DOI	10.3847/1538-4365/ad2ddd
产权排序	第7完成单位
文献子类	Article
英文摘要	Stellar flares are critical phenomena on stellar surfaces, which are closely tied to stellar magnetism. While extensively studied in main-sequence (MS) stars, their occurrence in evolved compact stars, specifically hot subdwarfs and white dwarfs (WDs), remains scarcely explored. Based on Cycles 1-5 of TESS photometry, we conducted a pioneering survey of flare events in similar to 12,000 compact stars, corresponding to similar to 38,000 light curves with a 2 minute cadence. Through dedicated techniques for detrending light curves, identifying preliminary flare candidates, and validating them via machine learning, we established a catalog of 1016 flares from 193 compact stars, including 182 from 58 sdB/sdO stars and 834 from 135 WDs, respectively. However, all flaring compact stars showed signs of contamination from nearby objects or companion stars, preventing sole attribution of the detected flares. For WDs, it is highly probable that the flares originated from their cool MS companions. In contrast, the higher luminosities of sdB/sdO stars diminish companion contributions, suggesting that detected flares originated from sdB/sdO stars themselves or through close magnetic interactions with companions. Focusing on a refined sample of 23 flares from 13 sdB/sdO stars, we found their flare frequency distributions were slightly divergent from those of cool MS stars; instead, they resemble those of hot B/A-type MS stars having radiative envelopes. This similarity implies that the flares on sdB/sdO stars, if these flares did originate from them, may share underlying mechanisms with hot MS stars, which warrants further investigation.
学科主题	天文学 ; 天文学:恒星与银河系
URL标识	查看原文
出版地	TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
资助项目	MOST divided by National Natural Science Foundation of China (NSFC)https://doi.org/10.13039/501100001809[12273002]; MOST divided by National Natural Science Foundation of China (NSFC)https://doi.org/10.13039/501100001809[12090040]; MOST divided by National Natural Science Foundation of China (NSFC)https://doi.org/10.13039/501100001809[12090042]; MOST divided by National Natural Science Foundation of China (NSFC)https://doi.org/10.13039/501100001809[11988101]; MOST divided by National Natural Science Foundation of China (NSFC)https://doi.org/10.13039/501100001809[11933004]; National Natural Science Foundation of China (NSFC)[202302AN360001]; National Natural Science Foundation of China (NSFC)[202302AN36000102]; International Centre of Supernovae at Yunnan Key Laboratory; China Manned Space Project; INAF mini-grant on Hot subdwarfs; Centre National d'Etudes Spatiales (CNES, France); Chinese Academy of Sciences (CAMS)[2023M730297]; China Postdoctoral Science Foundation[2021YFA1600402]; National Key Research and Development Program of China[XDB41000000]; B-type Strategic Priority Program of the Chinese Academy of Sciences; Youth Innovation Promotion Association of the Chinese Academy of Sciences[2021b]; Yunnan Ten Thousand Talents Plan Young & Elite Talents Project; NASA Explorer Program
WOS关键词	A-TYPE STARS ; STELLAR FLARES ; STATISTICAL-ANALYSIS ; MAGNETIC-FIELDS ; LIGHT FLARES ; DISCOVERY ; OUTBURSTS ; CATALOG ; ASTROPY ; PACKAGE
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	IOP Publishing Ltd
WOS记录号	WOS:001198909500001
资助机构	MOST divided by National Natural Science Foundation of China (NSFC)https://doi.org/10.13039/501100001809[12273002, 12090040, 12090042, 11988101, 11933004] ; National Natural Science Foundation of China (NSFC)[202302AN360001, 202302AN36000102] ; International Centre of Supernovae at Yunnan Key Laboratory ; China Manned Space Project ; INAF mini-grant on Hot subdwarfs ; Centre National d'Etudes Spatiales (CNES, France) ; Chinese Academy of Sciences (CAMS)[2023M730297] ; China Postdoctoral Science Foundation[2021YFA1600402] ; National Key Research and Development Program of China[XDB41000000] ; B-type Strategic Priority Program of the Chinese Academy of Sciences ; Youth Innovation Promotion Association of the Chinese Academy of Sciences[2021b] ; Yunnan Ten Thousand Talents Plan Young & Elite Talents Project ; NASA Explorer Program
内容类型	期刊论文
版本	出版稿
源URL	[http://ir.ynao.ac.cn/handle/114a53/27056]
专题	云南天文台_恒星物理研究组
作者单位	1.College of Science, Chongqing University of Posts and Telecommunications, Chongqing 400065, People's Republic of China 2.University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China; 3.Center for Astronomical Mega-Science, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, Beijing 100012, People's Republic of China; 4.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, 396 Yangfangwang, Guandu District, Kunming 650216, People's Republic of China; 5.Yunnan Observatories, Chinese Academy of Sciences, 396 Yangfangwang, Guandu District, Kunming 650216, People's Republic of China; 6.Department of Astronomy & Institute for Astrophysical Research, Boston University, 725 Commonwealth Avenue, Boston, MA 02215, USA; 7.Institut de Recherche en Astrophysique et Planétologie, CNRS, Université de Toulouse, CNES, 14 Avenue Edouard Belin, F-31400 Toulouse, France; 8.INAF-Osservatorio Astrofisico di Torino, Strada dell'Osservatorio 20, I-10025 Pino Torinese, Italy; 9.International Centre of Supernovae, Yunnan Key Laboratory, Kunming 650216, People's Republic of China; 10.Department of Astronomy, Beijing Normal University, Beijing 100875, People's Republic of China;
推荐引用方式 GB/T 7714	Xing, Keyu,Zong, Weikai,Silvotti, Roberto,et al. Flare Hunting in Hot Subdwarf and White Dwarf Stars from Cycles 1-5 of TESS Photometry[J]. ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES,2024,271(2).
APA	Xing, Keyu.,Zong, Weikai.,Silvotti, Roberto.,Fu, Jian-Ning.,Charpinet, Stéphane.,...&Wang, Jiaxin.(2024).Flare Hunting in Hot Subdwarf and White Dwarf Stars from Cycles 1-5 of TESS Photometry.ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES,271(2).
MLA	Xing, Keyu,et al."Flare Hunting in Hot Subdwarf and White Dwarf Stars from Cycles 1-5 of TESS Photometry".ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES 271.2(2024).