An alternative formation scenario for uranium-rich giants: engulfing an Earth-like planet
文献类型：期刊论文
| 作者 | Xie, Dian1,2; Zhu, Chunhua2 ; Guo, Sufen2; Liu, Helei2; Lu, Guoliang1,2
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| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
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| 出版日期 | 2023-07-24 |
| 卷号 | 524期号:3页码:3705-3711 |
| ISSN号 | 0035-8711 |
| 关键词 | accretion accretion discs convection stars: chemically peculiar stars: evolution |
| DOI | 10.1093/mnras/stad2097 |
| 通讯作者 | Zhu, Chunhua(chunhuazhu@sina.cn) ; Lu, Guoliang(guolianglv@xao.ac.cn) |
| 英文摘要 | The actinides, such as the uranium (U) element, are typically synthesized through the rapid neutron-capture process (r-process), which can occur in core-collapse supernovae or double neutron star mergers. There exist nine r-process giant stars exhibiting conspicuous U abundances, commonly referred to as U-rich giants. However, the origins of these U-rich giants remain ambiguous. We propose an alternative formation scenario for these U-rich giants whereby a red giant (RG) engulfs an Earth-like planet. To approximate the process of an RG engulfing an Earth-like planet, we employ an accretion model wherein the RG assimilates materials from said planet. Our findings demonstrate that this engulfment event can considerably enhance the presence of heavy elements originating from Earth-like planets on the surfaces of very metal-poor stars (Z = 0.00001), while its impact on solar-metallicity stars is comparatively modest. Importantly, the structural and evolutionary properties of both very metal-poor and solar-metallicity stars remain largely unaffected. Notably, our engulfment model effectively accounts for the observed U abundances in known U-rich giants. Furthermore, the evolutionary trajectories of U abundances on the surfaces of RGs subsequent to the engulfment of Earth-like planets encompass all known U-rich giants. Therefore, it is plausible that U-rich giants are formed when an RG engulfs an Earth-like planet. |
| WOS关键词 | PROCESS ENHANCED STAR ; METAL-POOR STARS ; CONVECTIVE BOUNDARIES ; CHEMICAL-COMPOSITION ; WHITE-DWARFS ; STELLAR ; MODULES ; ABUNDANCES ; ENGULFMENT ; COMPANIONS |
| 资助项目 | National Natural Science Foundation of China[12163005] ; National Natural Science Foundation of China[U2031204] ; National Natural Science Foundation of China[11863005] ; China Manned Space Project[CMS-CSST-2021-A10] ; Natural Science Foundation of Xinjiang[2021D01C075] ; Natural Science Foundation of Xinjiang[2020D01D85] |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| 出版者 | OXFORD UNIV PRESS |
| WOS记录号 | WOS:001050361400038 |
| 资助机构 | National Natural Science Foundation of China ; China Manned Space Project ; Natural Science Foundation of Xinjiang |
| 源URL | [http://ir.xao.ac.cn/handle/45760611-7/5412]  |
| 专题 | 研究单元未命名 |
| 通讯作者 | Zhu, Chunhua; Lu, Guoliang |
| 作者单位 | 1.Chinese Acad Sci, Xinjiang Astron Observ, 150 Sci 1 St, Urumqi 830011, Xinjiang, Peoples R China 2.Xinjiang Univ, Sch Phys Sci & Technol, Urumqi 830017, Peoples R China |
| 推荐引用方式 GB/T 7714 | Xie, Dian,Zhu, Chunhua,Guo, Sufen,et al. An alternative formation scenario for uranium-rich giants: engulfing an Earth-like planet[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2023,524(3):3705-3711. |
| APA | Xie, Dian,Zhu, Chunhua,Guo, Sufen,Liu, Helei,&Lu, Guoliang.(2023).An alternative formation scenario for uranium-rich giants: engulfing an Earth-like planet.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,524(3),3705-3711. |
| MLA | Xie, Dian,et al."An alternative formation scenario for uranium-rich giants: engulfing an Earth-like planet".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 524.3(2023):3705-3711. |
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