| A seven-Earth-radius helium-burning star inside a 20.5-min detached binary | |
Lin, Jie1,2,3; Wu CY(吴程远)4,5,6 ; Xiong, Heran7; Wang, Xiaofeng1,8; Németh, Péter9,10; Han ZW(韩占文)4,5,6; Li JD(李江丹)4,5; Elias-Rosa, Nancy11,12; Salmaso, Irene11,13; Filippenko, Alexei V.14; Brink, Thomas G.14; Yang, Yi14; Chen XF(陈雪飞)4,5,6; Yan, Shengyu1; Zhang JJ(张居甲)4,5,6; Guo, Sufen15; Cai YZ(蔡永志)4,5,6; Mo, Jun1; Xi, Gaobo1; Liu, Jialian1; Guo, Jincheng8; Xia, Qiqi1; Xiang, Danfeng1; Li, Gaici1; Li ZW(李振威)4,5; Zheng, WeiKang14; Zhang, Jicheng16,17; Liu, Qichun1; Guo, Fangzhou1; Chen, Liyang1; Li, Wenxiong18,19
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| 发表期刊 | NATURE ASTRONOMY
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| 2024 | |
| DOI | 10.1038/s41550-023-02188-2 |
| 产权排序 | 第4完成单位 |
| 收录类别 | SCI |
| 摘要 | Binary evolution theory predicts that the second common envelope ejection can produce low-mass (0.32-0.36 M circle dot) subdwarf B (sdB) stars inside ultrashort-orbital-period binary systems, as their helium cores are ignited under nondegenerate conditions. With the orbital decay driven by gravitational-wave (GW) radiation, the minimum orbital periods of detached sdB binaries could be as short as similar to 20 min. However, only four sdB binaries with orbital periods below an hour have been reported so far, and none of them has an orbital period approaching the above theoretical limit. Here we report the discovery of a 20.5-min-orbital-period ellipsoidal binary, TMTS J052610.43+593445.1, in which the visible star is being tidally deformed by an invisible carbon-oxygen white dwarf companion. The visible component is inferred to be an sdB star with a mass similar to 0.33 M circle dot approaching the helium-ignition limit, although a He-core white dwarf cannot be completely ruled out. In particular, the radius of this low-mass sdB star is only 0.066 R circle dot, about seven Earth radii. Such a system provides a key clue in mapping the binary evolution scheme from the second common envelope ejection to the formation of AM CVn stars having a helium-star donor. It may also serve as a crucial verification binary of space-borne GW observatories such as LISA and TianQin in the future. A very uncommon detached binary system with a 20.5-min orbital period has been discovered to harbour a carbon-oxygen white dwarf star and a low-mass subdwarf B star with a seven-Earth radius that traces the theoretical limit of binary evolution predicted 20 years ago. |
| 资助项目 | National Natural Science Foundation of China (NSFC)[12033003]; National Natural Science Foundation of China (NSFC)[12288102]; National Natural Science Foundation of China (NSFC)[11633002]; National Natural Science Foundation of China (NSFC)[202301AU070039]; Ma Huateng Foundation; New Cornerstone Science Foundation through the XPLORER PRIZE; China Manned-Spaced Project[CMS-CSST-2021-A12]; Scholar Program of the Beijing Academy of Science and Technology; Cyrus Chun Ying Tang Foundations; Yunnan Fundamental Research Projects[202302AN360001]; International Centre of Supernovae, Yunnan Key Laboratory[20179ZF5KS]; Grant Agency of the Czech Republic (GACR); Research Projects of National Relevance (PRIN) - Italian Ministry of Education, University and Research (MIUR)[NNX08AR22G]; Spanish Ministry of Science, Innovation and Universities[PID2020-112949GB-I00]; European Regional Development Fund; MIUR through PRIN 2017[NNX08AR22G]; MIUR through PRIN-INAF 2022; Istituto Nazionale di Astrofisica through the University of Padova; MIUR; Christopher R. Redlich Fund; GRANTECAN; National Plan of Astronomy and Astrophysics of the Spanish Government; US National Science Foundation (NSF)[22-34467S]; NASA[67985815]; NSF; MCIN/AEI/; European Union; |
| 项目资助者 | National Natural Science Foundation of China (NSFC)[12033003, 12288102, 11633002, 202301AU070039] ; Ma Huateng Foundation ; New Cornerstone Science Foundation through the XPLORER PRIZE ; China Manned-Spaced Project[CMS-CSST-2021-A12] ; Scholar Program of the Beijing Academy of Science and Technology ; Cyrus Chun Ying Tang Foundations ; Yunnan Fundamental Research Projects[202302AN360001] ; International Centre of Supernovae, Yunnan Key Laboratory[20179ZF5KS] ; Grant Agency of the Czech Republic (GACR) ; Research Projects of National Relevance (PRIN) - Italian Ministry of Education, University and Research (MIUR)[NNX08AR22G] ; Spanish Ministry of Science, Innovation and Universities[PID2020-112949GB-I00] ; European Regional Development Fund ; MIUR through PRIN 2017[NNX08AR22G] ; MIUR through PRIN-INAF 2022 ; Istituto Nazionale di Astrofisica through the University of Padova ; MIUR ; Christopher R. Redlich Fund ; GRANTECAN ; National Plan of Astronomy and Astrophysics of the Spanish Government ; US National Science Foundation (NSF)[22-34467S] ; NASA[67985815] ; NSF ; MCIN/AEI/ ; European Union ; [12003013] ; [PID2019-108709GB-I00] ; [AST-1440341] ; [AST-1238877] ; [776403] ; [BS202002] |
| 语种 | 英语 |
| 学科领域 | 天文学 |
| 文章类型 | Article; Early Access |
| 出版者 | NATURE PORTFOLIO |
| 出版地 | HEIDELBERGER PLATZ 3, BERLIN, 14197, GERMANY |
| ISSN | 2397-3366 |
| URL | 查看原文 |
| WOS记录号 | WOS:001161147700002 |
| WOS研究方向 | Astronomy & Astrophysics |
| WOS类目 | Astronomy & Astrophysics |
| 关键词[WOS] | LISA VERIFICATION BINARIES ; SUBDWARF-B-STARS ; LOW-MASS ; WHITE-DWARFS ; SDB STARS ; EVOLUTION ; TELESCOPE ; CHANNEL ; POPULATION ; KINEMATICS |
| 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/114a53/26427 |
| 专题 | 大样本恒星演化研究组 南方基地 中国科学院天体结构与演化重点实验室 |
| 作者单位 | 1.Physics Department and Tsinghua Center for Astrophysics, Tsinghua University, Beijing, People’s Republic of China; 2.CAS Key Laboratory for Research in Galaxies and Cosmology, Department of Astronomy, University of Science and Technology of China, Hefei, People’s Republic of China; 3.School of Astronomy and Space Sciences, University of Science and Technology of China, Hefei, People’s Republic of China; 4.Yunnan Observatories, Chinese Academy of Sciences, Kunming, People’s Republic of China; 5.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming, People’s Republic of China; 6.International Centre of Supernovae, Yunnan Key Laboratory, Kunming, People’s Republic of China; 7.Research School of Astronomy & Astrophysics, Australian National University, Canberra, Australia; 8.Beijing Planetarium, Beijing Academy of Sciences and Technology, Beijing, People’s Republic of China; 9.Astronomical Institute of the Czech Academy of Sciences, Ondřejov, Czech Republic; 10.Astroserver.org, Malomsok, Hungary; 11.INAF-Osservatorio Astronomico di Padova, Padua, Italy; 12.Institute of Space Sciences (ICE, CSIC), Campus UAB, Carrer de Can Magrans s/n, Barcelona, Spain; 13.Dipartimento di Fisica e Astronomia ‘G. Galilei’, Università degli Studi di Padova, Padua, Italy; 14.Department of Astronomy, University of California, Berkeley, Berkeley, USA; 15.School of Physical Science and Technology, Xinjiang University, Urumqi, People’s Republic of China; 16.Institute for Frontiers in Astronomy and Astrophysics, Beijing Normal University, Beijing, People’s Republic of China; 17.Department of Astronomy, Beijing Normal University, Beijing, People’s Republic of China; 18.National Astronomical Observatories, Chinese Academy of Sciences, Beijing, China; 19.The School of Physics and Astronomy, Tel Aviv University, Tel Aviv, Israel |
| 推荐引用方式 GB/T 7714 | Lin, Jie,Wu CY,Xiong, Heran,et al. A seven-Earth-radius helium-burning star inside a 20.5-min detached binary[J]. NATURE ASTRONOMY,2024. |
| APA | Lin, Jie.,吴程远.,Xiong, Heran.,Wang, Xiaofeng.,Németh, Péter.,...&Li, Wenxiong.(2024).A seven-Earth-radius helium-burning star inside a 20.5-min detached binary.NATURE ASTRONOMY. |
| MLA | Lin, Jie,et al."A seven-Earth-radius helium-burning star inside a 20.5-min detached binary".NATURE ASTRONOMY (2024). |
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| A seven-Earth-radius（7854KB） | 期刊论文 | 出版稿 | 开放获取 | CC BY-NC-SA | 浏览 请求全文 | |
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