Einstein Probe Discovery of EP J005245.1-722843: A Rare Be-White Dwarf Binary in the Small Magellanic Cloud?
文献类型：期刊论文
| 作者 | Marino, A.3,22; Yang, H. N.5,6,7; Zelati, F. Coti3,22; Rea, N.3,22; Guillot, S.8; Jaisawal, G. K.9; Maitra, C.6; Ness, J.-U.10; Haberl, F.6; Kuulkers, E.11 |
| 刊名 | ASTROPHYSICAL JOURNAL LETTERS
 |
| 出版日期 | 2025-02-20 |
| 卷号 | 980期号:2 |
| ISSN号 | 2041-8205 |
| DOI | 10.3847/2041-8213/ad9580 |
| 产权排序 | 第19完成单位 |
| 文献子类 | Article |
| 英文摘要 | 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. |
| 学科主题 | 天文学 ; 恒星与银河系 ; 星系与宇宙学 |
| URL标识 | 查看原文 |
| 出版地 | TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND |
| WOS关键词 | SOFT-X-RAY ; OPTICAL SPECTROSCOPY ; SUPERSOFT SOURCE ; RECURRENT NOVA ; HELIUM STARS ; EVOLUTION ; SPECTRA ; SWIFT ; POPULATION ; PHASE |
| 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 |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001425338500001 |
| 出版者 | IOP Publishing Ltd |
| 资助机构 | 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 |
| 版本 | 出版稿 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/28174]  |
| 专题 | 星系类星体研究组 |
| 作者单位 | 1.MIT Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USA; 2.Joint Space-Science Institute, NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA 3.Institute of Space Sciences (ICE, CSIC), Campus UAB, Carrer de Can Magrans s/n, 08193, Barcelona, Spain; marino@ice.csic.es; 4.Department of Physics and Astronomy, University of Nevada Las Vegas, NV 89154, USA; 5.National Astronomical Observatories, Chinese Academy of Sciences, Beijing, 100101, People's Republic of China; hnyang@nao.cas.cn; 6.Max-Planck-Institut für extraterrestrische Physik, Gießenbachstraße 1, D-85748 Garching bei München, Germany; 7.School of Astronomy and Space Sciences, University of Chinese Academy of Sciences, Beijing, 100049, People's Republic of China; 8.IRAP, CNRS, 9 avenue du Colonel Roche, BP 44346, 31028 Toulouse Cedex 4, France; 9.DTU Space, Technical University of Denmark, Elektrovej 327-328, DK-2800 Lyngby, Denmark; 10.European Space Agency (ESA), European Space Astronomy Centre (ESAC), Camino Bajo del Castillo s/n, E-28692 Villanueva de la Cañada, Madrid, Spain; |
| 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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