Einstein Probe Discovery of EP J171159.4-333253: An Eclipsing Neutron Star Low-mass X-Ray Binary with Clocked Bursts
文献类型：期刊论文
| 作者 | Wang, Y. L.1,2,3,4; Coti Zelati, F.2,3,5; Parent, E.2,3; Marino, A.2,3,6; Rea, N.2,3; Dhillon, V. S.7,8; Blanco-Pozo, J.2,3; Ribas, I.2,3; Littlefair, S. P.7; Yang, Z. H.4,9 |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2026-05-20 |
| 卷号 | 1003期号:1 |
| ISSN号 | 0004-637X |
| DOI | 10.3847/1538-4357/ae5bb2 |
| 产权排序 | 第10完成单位 |
| 文献子类 | Article |
| 英文摘要 | EP J171159.4-333253 is a new neutron star low-mass X-ray binary discovered in outburst by the Einstein Probe (EP) on 2025 June 23, exhibiting clocked type I X-ray bursts, eclipses, and dips. In this paper, we report on the results of the X-ray spectral and timing analyses for EP J171159.4-333253 using data collected by EP and NuSTAR during the first 21 days of the outburst. The X-ray burst recurrence time can be characterized over a subset of nine bursts spanning 1.6 days around the NuSTAR observation, and the result is trec = 8196 +/- 177 s, with indications of a possible decreasing trend. From the X-ray eclipse events, the binary orbital period and the eclipse duration are estimated to be Porb = 6.48301 +/- 0.00003 hr and D star,X=1245.5-6.5+6.9 s, respectively. These enable an estimate of the mass and radius of the companion star and the binary inclination, which are M2 approximate to 0.6-0.8 M circle dot, R2 approximate to 0.7-0.8 R circle dot, and i approximate to 73 degrees-75 degrees, respectively. We also report on joint ULTRACAM and EP observations on 2025 July 21-22, detecting the source optical counterpart and covering an eclipse in both X-ray and optical bands. The optical eclipse is wavelength dependent and broader than in X-rays, indicating that part of the optical emission arises from an extended region in the accretion flow. Despite a moderate variation in the source flux, the properties of the persistent X-ray emission are typical of a hard spectral state. We further evaluated the ratio of the accretion energy to the thermonuclear energy to be 120-130, implying helium bursts with the accreted hydrogen being depleted in between bursts. |
| 学科主题 | 天文学 ; 星系与宇宙学 |
| URL标识 | 查看原文 |
| 出版地 | No.2 The Distillery, Glassfields, Avon Street, Bristol, ENGLAND |
| WOS关键词 | SPECTROSCOPIC EXTINCTION CURVES ; BLACK-HOLE TRANSIENT ; CATACLYSMIC VARIABLES ; SRGA J144459.2-604207 ; ACCRETION DISKS ; FAR-ULTRAVIOLET ; PULSAR ; TELESCOPE ; NUSTAR ; STATES |
| 资助项目 | Chinese Academy of Sciences (CAS)[XDB0550200]; MOST divided by National Natural Science Foundation of China (NSFC)[12333004]; EC divided by European Research Council (ERC)[817661]; UKRI divided by Science and Technology Facilities Council (STFC)[ST/Z000033/1]; China Scholarship Council (CSC)[202404910397] |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001761246800001 |
| 出版者 | IOP Publishing Ltd |
| 资助机构 | Chinese Academy of Sciences (CAS)[XDB0550200] ; MOST divided by National Natural Science Foundation of China (NSFC)[12333004] ; EC divided by European Research Council (ERC)[817661] ; UKRI divided by Science and Technology Facilities Council (STFC)[ST/Z000033/1] ; China Scholarship Council (CSC)[202404910397] |
| 版本 | 出版稿 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/29182]  |
| 专题 | 云南天文台_中国科学院天体结构与演化重点实验室 |
| 通讯作者 | Wang, Y. L. |
| 作者单位 | 1.National Astronomical Observatories, Chinese Academy of Sciences, 20A Datun Road, Beijing 100101, People’s Republic of China; wangyilong@nao.cas.cn; 2.Institute of Space Sciences (ICE, CSIC), Campus UAB, Carrer de Can Magrans s/n, Barcelona, E-08193, Spain; 3.Institut d’Estudis Espacials de Catalunya (IEEC), Carrer Gran Capità 2-4, Barcelona, E-08034, Spain; 4.School of Astronomy and Space Science, University of Chinese Academy of Sciences, 19A Yuquan Road, Beijing 100049, People’s Republic of China; 5.INAF—Osservatorio Astronomico di Brera, Via Bianchi 46, I-23807 Merate (LC), Italy; 6.INAF, Istituto di Astrofisica Spaziale e Fisica Cosmica, Via U. La Malfa 153, I-90146 Palermo, Italy; 7.Astrophysics Research Cluster, School of Mathematical & Physical Sciences, University of Sheffield, Sheffield S3 7RH, UK; 8.Instituto de Astrofísica de Canarias, E-38205 La Laguna, Tenerife, Spain; 9.Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, People’s Republic of China; 10.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650216, People’s Republic of China; |
| 推荐引用方式 GB/T 7714 | Wang, Y. L.,Coti Zelati, F.,Parent, E.,et al. Einstein Probe Discovery of EP J171159.4-333253: An Eclipsing Neutron Star Low-mass X-Ray Binary with Clocked Bursts[J]. ASTROPHYSICAL JOURNAL,2026,1003(1). |
| APA | Wang, Y. L..,Coti Zelati, F..,Parent, E..,Marino, A..,Rea, N..,...&Zhao, Q. C..(2026).Einstein Probe Discovery of EP J171159.4-333253: An Eclipsing Neutron Star Low-mass X-Ray Binary with Clocked Bursts.ASTROPHYSICAL JOURNAL,1003(1). |
| MLA | Wang, Y. L.,et al."Einstein Probe Discovery of EP J171159.4-333253: An Eclipsing Neutron Star Low-mass X-Ray Binary with Clocked Bursts".ASTROPHYSICAL JOURNAL 1003.1(2026). |
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来源：云南天文台
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