Einstein Probe Discovery of EP J005245.1-722843: A Rare Be-White Dwarf Binary in the Small Magellanic Cloud?

doi:10.3847/2041-8213/ad9580

YNAO OpenIR > 星系类星体研究组

	Einstein Probe Discovery of EP J005245.1-722843: A Rare Be-White Dwarf Binary in the Small Magellanic Cloud?
	Marino, A.1,2; Yang, H. N.3,4,5; Zelati, F. Coti 1,2; Rea, N.1,2; Guillot, S.6; Jaisawal, G. K.7; Maitra, C.4; Ness, J.-U.8; Haberl, F.4; Kuulkers, E.9; Yuan, W.3,5; Feng, H.10; Tao, L.10; Jin, C.3,5; Sun, H.3; Zhang, W.3; Chen, W.3,5; Heuvel, E. P. J. van den 11; Soria, R.12,13,14; Zhang, B.15,16; Weng, S.-S.17; Ji, L.18; Zhang GB(张国宝)19 ; Pan, X.3; Lv, Z.3,5; Zhang, C.3,5; Ling, Z. X.3,5; Chen, Y.10; Jia, S.5,10; Liu, Y.3; Cheng, H. Q.3; Li, D. Y.3; Gendreau, K.20; Ng, M.21; Strohmayer, T.20,22
发表期刊	ASTROPHYSICAL JOURNAL LETTERS
	2025-02-20
卷号	980 期号:2
DOI	10.3847/2041-8213/ad9580
产权排序	第19完成单位
收录类别	SCI
摘要	On 2024 May 27, the Wide-field X-ray Telescope on board the Space Sciences, University of Chinese Academy of Einstein Probe (EP) mission detected enhanced X-ray emission from a new transient source in the Small Magellanic Cloud during its commissioning phase. Prompt follow-up with the EP Follow-up X-ray Telescope, the Swift X-ray Telescope. and NICER have revealed a very soft, thermally emitting source (kT similar to 0.1 keV at the outburst peak) with an X-ray luminosity of L similar to 4 x 10(38) erg s(-1), labeled EP J005245.1-722843. This supersoft outburst faded very quickly in a week's time. Several emission lines and absorption edges were present in the X-ray spectrum, including deep nitrogen (0.67 keV) and oxygen (0.87 keV) absorption edges. The X-ray emission resembles the supersoft source phase of typical nova outbursts from an accreting white dwarf (WD) in a binary system, despite the X-ray source being historically associated with an O9-B0e massive star exhibiting a 17.55 day periodicity in the optical band. The discovery of this supersoft outburst suggests that EP J005245.1-722843 is a BeWD X-ray binary: an elusive evolutionary stage where two main-sequence massive stars have undergone a common envelope phase and experienced at least two episodes of mass transfer. In addition, the very short duration of the outburst and the presence of Ne features hint at a rather massive, i.e., close to the Chandrasekhar limit, Ne-O WD in the system.
资助项目	Strategic Priority Program on Space Science of Chinese Academy of Sciences; CNES[XDA15310000]; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB0550200]; National Key R&D Program of China[2022YFF0711500]; NASA - ESA Member States; Chandra X-ray Observatory
项目资助者	Strategic Priority Program on Space Science of Chinese Academy of Sciences ; CNES[XDA15310000] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB0550200] ; National Key R&D Program of China[2022YFF0711500] ; NASA - ESA Member States ; Chandra X-ray Observatory
语种	英语
学科领域	天文学 ; 恒星与银河系 ; 星系与宇宙学
文章类型	Article
出版者	IOP Publishing Ltd
出版地	TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
ISSN	2041-8205
URL	查看原文
WOS记录号	WOS:001425338500001
WOS研究方向	Astronomy & Astrophysics
WOS类目	Astronomy & Astrophysics
关键词[WOS]	SOFT-X-RAY ; OPTICAL SPECTROSCOPY ; SUPERSOFT SOURCE ; RECURRENT NOVA ; HELIUM STARS ; EVOLUTION ; SPECTRA ; SWIFT ; POPULATION ; PHASE
引用统计
文献类型	期刊论文
版本	出版稿
条目标识符	http://ir.ynao.ac.cn/handle/114a53/28174
专题	星系类星体研究组
作者单位	1.Institute of Space Sciences (ICE, CSIC), Campus UAB, Carrer de Can Magrans s/n, 08193, Barcelona, Spain; [email protected]; 2.Institut d'Estudis Espacials de Catalunya (IEEC), Esteve Terradas 1, RDIT Building, Of. 212 Mediterranean Technology Park (PMT), 08860, Castelldefels, Spain; 3.National Astronomical Observatories, Chinese Academy of Sciences, Beijing, 100101, People's Republic of China; [email protected]; 4.Max-Planck-Institut für extraterrestrische Physik, Gießenbachstraße 1, D-85748 Garching bei München, Germany; 5.School of Astronomy and Space Sciences, University of Chinese Academy of Sciences, Beijing, 100049, People's Republic of China; 6.IRAP, CNRS, 9 avenue du Colonel Roche, BP 44346, 31028 Toulouse Cedex 4, France; 7.DTU Space, Technical University of Denmark, Elektrovej 327-328, DK-2800 Lyngby, Denmark; 8.European Space Agency (ESA), European Space Astronomy Centre (ESAC), Camino Bajo del Castillo s/n, E-28692 Villanueva de la Cañada, Madrid, Spain; 9.European Space Agency (ESA), European Space Research and Technology Centre (ESTEC), Keplerlaan 1, 2201 AZ Noordwijk, The Netherlands; 10.Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, People's Republic of China; 11.Anton Pannekoek Institute for Astronomy, University of Amsterdam, P.O. Box 94249, 1090 GE Amsterdam, The Netherlands; 12.INAF—Osservatorio Astrofisico di Torino, Strada Osservatorio 20, I-10025 Pino Torinese, Italy; 13.Sydney Institute for Astronomy, School of Physics A28, The University of Sydney, Sydney, NSW 2006, Australia; 14.College of Astronomy and Space Sciences, University of the Chinese Academy of Sciences, Beijing 100049, People's Republic of China; 15.Nevada Center for Astrophysics, University of Nevada Las Vegas, NV 89154, USA; 16.Department of Physics and Astronomy, University of Nevada Las Vegas, NV 89154, USA; 17.Department of Physics and Institute of Theoretical Physics, Nanjing Normal University, Nanjing, People's Republic of China; 18.School of Physics and Astronomy, Sun Yat-sen University, Zhuhai, 519082, People's Republic of China; 19.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650216, People's Republic of China; 20.Astrophysics Science Division, NASA's Goddard Space Flight Center, Greenbelt, MD 20771, USA; 21.MIT Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USA; 22.Joint Space-Science Institute, NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA
推荐引用方式 GB/T 7714	Marino, A.,Yang, H. N.,Zelati, F. Coti,et al. Einstein Probe Discovery of EP J005245.1-722843: A Rare Be-White Dwarf Binary in the Small Magellanic Cloud?[J]. ASTROPHYSICAL JOURNAL LETTERS,2025,980(2).
APA	Marino, A..,Yang, H. N..,Zelati, F. Coti.,Rea, N..,Guillot, S..,...&Strohmayer, T..(2025).Einstein Probe Discovery of EP J005245.1-722843: A Rare Be-White Dwarf Binary in the Small Magellanic Cloud?.ASTROPHYSICAL JOURNAL LETTERS,980(2).
MLA	Marino, A.,et al."Einstein Probe Discovery of EP J005245.1-722843: A Rare Be-White Dwarf Binary in the Small Magellanic Cloud?".ASTROPHYSICAL JOURNAL LETTERS 980.2(2025).

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