A white dwarf binary candidate discovered by LAMOST using dynamical method
文献类型：期刊论文
| 作者 | Zhu, Haifan3; Wang, Wei3; Li, Xue2,4; Li JJ(李佳佳)1,4 ; Tian, Pengfu3
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| 刊名 | JOURNAL OF HIGH ENERGY ASTROPHYSICS
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| 出版日期 | 2025-03 |
| 卷号 | 45页码:428-437 |
| 关键词 | Radial velocity Binary stars White dwarf |
| ISSN号 | 2214-4048 |
| DOI | 10.1016/j.jheap.2025.01.015 |
| 产权排序 | 第3完成单位 |
| 文献子类 | Article |
| 英文摘要 | We present the discovery of a binary system containing a white dwarf candidate using data from the LAMOST. Our analysis of the radial velocity data allowed us to determine an orbital period of approximately 0.953 days and a mass function of 0.129 M-circle dot. Through spectral energy distribution (SED) fitting, we obtained the stellar parameters of the visible star. By combining these results with the mass function, we established a relationship between the mass of the invisible star and the system's inclination angle, along with the Roche lobe radius. We find that the mass of the invisible star is below the Chandrasekhar limit when the inclination angle exceeds 35(degrees). Given that systems with large variations in radial velocity typically have high inclination angles, we classify the invisible star as a white dwarf candidate. The Roche lobe radius exceeds the physical radius of the visible star, indicating that no mass transfer occurs, which results in a weak ellipsoidal modulation effect. Additionally, we obtained light curves from the TESS, ASAS-SN, and CRTS surveys. The light curves also exhibit a periodicity of approximately 0.95 days, with ellipsoidal modulation only in the 2019 TESS observations. Coupled with the strong H-alpha emission line observed in the LAMOST MRS spectrum, we infer that the surface of the visible star contains significant hot spots. This obscures the system's inherently weak ellipsoidal modulation, resulting in a manifestation of rotational variables. Furthermore, an analysis of the dynamical characteristics of this system indicates that it has a high inclination angle (>60 degrees) and its orbital properties are consistent with those of typical thin disk stars, supporting the hypothesis that the invisible object is a white dwarf. |
| 学科主题 | 天文学 ; 恒星与银河系 |
| URL标识 | 查看原文 |
| 出版地 | RADARWEG 29, 1043 NX AMSTERDAM, NETHERLANDS |
| WOS关键词 | MASS ; SYSTEM ; STARS |
| 资助项目 | National Key Research and Development Program of China[2023YFA1607901]; National Key Research and Development Program of China[2021YFA0718503]; NSFC[12133007]; Youth Program of Natural Science Foundation of Hubei Province[2024AFB386]; Post-doctoral Fellowship Program (Grade C) of China Postdoctoral Science Foundation[GZC20241282]; Guoshoujing Telescope (the Large Sky Area Multi-Object Fiber Spectroscopic Telescope LAMOST); National Major Scientific Project built by the Chinese Academy of Sciences; National Development and Reform Commission |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001408838600001 |
| 出版者 | ELSEVIER |
| 资助机构 | National Key Research and Development Program of China[2023YFA1607901, 2021YFA0718503] ; NSFC[12133007] ; Youth Program of Natural Science Foundation of Hubei Province[2024AFB386] ; Post-doctoral Fellowship Program (Grade C) of China Postdoctoral Science Foundation[GZC20241282] ; Guoshoujing Telescope (the Large Sky Area Multi-Object Fiber Spectroscopic Telescope LAMOST) ; National Major Scientific Project built by the Chinese Academy of Sciences ; National Development and Reform Commission |
| 版本 | 出版稿 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/28056]  |
| 专题 | 云南天文台_大样本恒星演化研究组 |
| 作者单位 | 1.Yunnan Observatories, Chinese Academy of Sciences, Kunming, 650216, China; 2.Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, China; 3.Department of Astronomy, School of Physics and Technology, Wuhan University, Wuhan 430072, China; 4.College of Astronomy and Space Sciences, University of Chinese Academy of Sciences, Beijing 100049, China |
| 推荐引用方式 GB/T 7714 | Zhu, Haifan,Wang, Wei,Li, Xue,et al. A white dwarf binary candidate discovered by LAMOST using dynamical method[J]. JOURNAL OF HIGH ENERGY ASTROPHYSICS,2025,45:428-437. |
| APA | Zhu, Haifan,Wang, Wei,Li, Xue,李佳佳,&Tian, Pengfu.(2025).A white dwarf binary candidate discovered by LAMOST using dynamical method.JOURNAL OF HIGH ENERGY ASTROPHYSICS,45,428-437. |
| MLA | Zhu, Haifan,et al."A white dwarf binary candidate discovered by LAMOST using dynamical method".JOURNAL OF HIGH ENERGY ASTROPHYSICS 45(2025):428-437. |
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来源：云南天文台
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