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A seven-Earth-radius helium-burning star inside a 20.5-min detached binary

文献类型：期刊论文

作者Lin, Jie2,3,4; Wu CY(吴程远)5,6,7; Xiong, Heran8; Wang, Xiaofeng2,9; Németh, Péter10,11; Han ZW(韩占文)5,6,7; Li JD(李江丹)5,6; Elias-Rosa, Nancy12,13; Salmaso, Irene12,14; Filippenko, Alexei V.15
刊名NATURE ASTRONOMY
出版日期2024
ISSN号2397-3366
DOI10.1038/s41550-023-02188-2
产权排序第4完成单位
文献子类Article; Early Access
英文摘要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.
学科主题天文学
URL标识查看原文
出版地HEIDELBERGER PLATZ 3, BERLIN, 14197, GERMANY
WOS关键词LISA VERIFICATION BINARIES ; SUBDWARF-B-STARS ; LOW-MASS ; WHITE-DWARFS ; SDB STARS ; EVOLUTION ; TELESCOPE ; CHANNEL ; POPULATION ; KINEMATICS
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;
WOS研究方向Astronomy & Astrophysics
语种英语
出版者NATURE PORTFOLIO
WOS记录号WOS:001161147700002
资助机构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]
版本出版稿
源URL[http://ir.ynao.ac.cn/handle/114a53/26427]  
专题云南天文台_大样本恒星演化研究组
云南天文台_丽江天文观测站（南方基地）
云南天文台_中国科学院天体结构与演化重点实验室
作者单位1.National Astronomical Observatories, Chinese Academy of Sciences, Beijing, China;
2.Physics Department and Tsinghua Center for Astrophysics, Tsinghua University, Beijing, People’s Republic of China;
3.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;
4.School of Astronomy and Space Sciences, University of Science and Technology of China, Hefei, People’s Republic of China;
5.Yunnan Observatories, Chinese Academy of Sciences, Kunming, People’s Republic of China;
6.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming, People’s Republic of China;
7.International Centre of Supernovae, Yunnan Key Laboratory, Kunming, People’s Republic of China;
8.Research School of Astronomy & Astrophysics, Australian National University, Canberra, Australia;
9.Beijing Planetarium, Beijing Academy of Sciences and Technology, Beijing, People’s Republic of China;
10.Astronomical Institute of the Czech Academy of Sciences, Ondřejov, Czech Republic;
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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