Evolution Models of CO White Dwarf-Asymptotic Giant Branch Star Merger Remnants
文献类型：期刊论文
| 作者 | Wu CY(吴程远)1,4; Xiong, Heran2; Jia S(贾石)1,4; Zhang ZY(张正阳)1,3,4; Wang B(王博)1,4 |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2026-01-20 |
| 卷号 | 997期号:1 |
| ISSN号 | 0004-637X |
| DOI | 10.3847/1538-4357/ae2c7c |
| 产权排序 | 第1完成单位 |
| 文献子类 | Article |
| 英文摘要 | Common envelope evolution is a critical but still poorly understood phase in binary evolution. It plays a key role in forming close binaries such as hot subdwarfs, double white dwarfs (WDs), X-ray binaries, and double neutron stars. However, its outcomes remain highly uncertain. Depending on the efficiency of envelope ejection, a system may either survive as a close binary or undergo a complete merger. In this work, we investigate the postmerger evolution of systems where a CO WD merges with the core of an asymptotic giant branch (AGB) star. A grid of merger remnant models with various core and envelope masses is constructed. At the onset of evolution, the CO core contracts and undergoes off-center carbon ignition, producing an inwardly propagating carbon flame. For remnants with a relatively low mass of CO core, the flame phase is followed by core contraction and subsequent H shell burning. For more massive CO cores, the carbon flame reaches the center and is soon followed by off-center neon burning, which is expected to eventually lead to core-collapse supernovae. The merger remnants occupy nearly the same region on the H-R diagram as ordinary AGB or super-AGB stars, exhibiting similar surface properties. Although their surface abundance may differ slightly from those of normal AGB stars, depending on the initial core and envelope masses, these differences are strongly reduced once mass loss is taken into account. We suggest that some giant-like stars, including candidates for Thorne-& Zdot;ytkow objects (e.g., HV 2112), might alternatively be explained as AGB-WD merger remnants. |
| 学科主题 | 天文学 ; 恒星与银河系 |
| URL标识 | 查看原文 |
| 出版地 | No.2 The Distillery, Glassfields, Avon Street, Bristol, ENGLAND |
| WOS关键词 | COMMON-ENVELOPE EVOLUTION ; ZYTKOW OBJECT CANDIDATE ; CARBON-OXYGEN ; CONVECTIVE BOUNDARIES ; VARIABLE-STARS ; GALACTIC PLANE ; IA SUPERNOVAE ; MODULES ; CRITERION ; DISCOVERY |
| 资助项目 | Yunnan Fundamental Research Project[202501AS070005]; National Key R&D Program of China[2021YFA1600404]; Yunnan Revitalization Talent Support Program[Young Talent project]; International Centre of Supernovae, Yunnan Key Laboratory[202302AN360001]; National Natural Science Foundation of China[12473032] |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001661475100001 |
| 出版者 | IOP Publishing Ltd |
| 资助机构 | Yunnan Fundamental Research Project[202501AS070005] ; National Key R&D Program of China[2021YFA1600404] ; Yunnan Revitalization Talent Support Program[Young Talent project] ; International Centre of Supernovae, Yunnan Key Laboratory[202302AN360001] ; National Natural Science Foundation of China[12473032] |
| 版本 | 出版稿 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/28855]  |
| 专题 | 云南天文台_大样本恒星演化研究组 |
| 通讯作者 | Wu CY(吴程远) |
| 作者单位 | 1.International Centre of Supernovae, Yunnan Key Laboratory, Kunming 650216, People’s Republic of China; 2.Research School of Astronomy and Astrophysics, The Australian National University, Canberra, ACT 2611, Australia; 3.University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China 4.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650216, People’s Republic of China; wuchengyuan@ynao.ac.cn, wangbo@ynao.ac.cn; |
| 推荐引用方式 GB/T 7714 | Wu CY,Xiong, Heran,Jia S,et al. Evolution Models of CO White Dwarf-Asymptotic Giant Branch Star Merger Remnants[J]. ASTROPHYSICAL JOURNAL,2026,997(1). |
| APA | 吴程远,Xiong, Heran,贾石,张正阳,&王博.(2026).Evolution Models of CO White Dwarf-Asymptotic Giant Branch Star Merger Remnants.ASTROPHYSICAL JOURNAL,997(1). |
| MLA | 吴程远,et al."Evolution Models of CO White Dwarf-Asymptotic Giant Branch Star Merger Remnants".ASTROPHYSICAL JOURNAL 997.1(2026). |
入库方式： OAI收割
来源：云南天文台
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