Chemical differences among collapsing low-mass protostellar cores
文献类型：期刊论文
| 作者 | Sun, Jingfei1; Li, Xiaohu1,5 ; Du, Fujun3,4; Wang, Yao3; Tuo, Juan1,2; Feng, Yanan1,2
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| 刊名 | ASTRONOMY & ASTROPHYSICS
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| 出版日期 | 2024-03-08 |
| 卷号 | 683页码:A76 |
| 关键词 | astrochemistry stars: protostars ISM: abundances ISM: clouds evolution ISM: molecules |
| ISSN号 | 0004-6361 |
| DOI | 10.1051/0004-6361/202348176 |
| 产权排序 | 1 |
| 英文摘要 | Context. Organic features lead to two distinct types of Class 0/I low-mass protostars: hot corino sources exhibiting abundant saturated complex organic molecules (COMs) and warm carbon-chain chemistry (WCCC) sources exhibiting abundant unsaturated carbon-chain molecules. Some observations suggest that the chemical variations between WCCC sources and hot corino sources are associated with local environments and the luminosity of protostars. Aims. We aim to investigate the physical conditions that significantly affect WCCC and hot corino chemistry, as well as to reproduce the chemical characteristics of prototypical WCCC sources and hybrid sources, where both carbon-chain molecules and COMs are abundant. Methods. We conducted a gas-grain chemical simulation in collapsing protostellar cores, adopting a selection of typical physical parameters for the fiducial model. By adjusting the values of certain physical parameters, such as the visual extinction of ambient clouds (A(V)(amb)), cosmic-ray ionization rate (zeta), maximum temperature during the warm-up phase (T-max ), and contraction timescale of protostars (t(cont)), we studied the dependence of WCCC and hot corino chemistry on these physical parameters. Subsequently, we ran a model with different physical parameters to reproduce scarce COMs in prototypical WCCC sources. Results. The fiducial model predicts abundant carbon-chain molecules and COMs. It also reproduces WCCC and hot corino chemistry in the hybrid source L483. This suggests that WCCC and hot corino chemistry can coexist in some hybrid sources. Ultraviolet (UV) photons and cosmic rays can boost WCCC features by accelerating the dissociation of CO and CH4 molecules. On the other hand, UV photons can weaken the hot corino chemistry by photodissociation reactions, while the dependence of hot corino chemistry on cosmic rays is relatively complex. The value of T-max does not affect any WCCC features, while it can influence hot corino chemistry by changing the effective duration of two-body surface reactions for most COMs. The long t(cont )can boost WCCC and hot corino chemistry by prolonging the effective duration of WCCC reactions in the gas phase and surface formation reactions for COMs, respectively. The scarcity of COMs in prototypical WCCC sources can be explained by insufficient dust temperatures in the inner envelopes that are typically required to activate hot corino chemistry. Meanwhile, the high zeta and the long t(cont) favors the explanation for scarce COMs in these sources. Conclusions. The chemical differences between WCCC sources and hot corino sources can be attributed to the variations in local environments, such as A(V)(amb )and zeta, as well as the protostellar property, t(cont). |
| WOS关键词 | METAL-POOR STARS ; NON-LTE ANALYSIS ; 1ST STARS ; R-PROCESS ; ABUNDANCE DETERMINATIONS ; BLUE STRAGGLERS ; NEUTRON-CAPTURE ; LINE-FORMATION ; EVOLUTION ; I. |
| 资助项目 | National Natural Science Foundation of China[11873094] ; National Natural Science Foundation of China[12041305] ; Natural Science Foundation of Jiangsu Province[BK20221163] |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001181364400004 |
| 出版者 | EDP SCIENCES S A |
| 资助机构 | National Natural Science Foundation of China ; Natural Science Foundation of Jiangsu Province |
| 源URL | [http://ir.xao.ac.cn/handle/45760611-7/6243]  |
| 专题 | 研究单元未命名 |
| 通讯作者 | Sun, Jingfei; Li, Xiaohu |
| 作者单位 | 1.Chinese Acad Sci, Xinjiang Astron Observ, 150 Sci 1 St, Urumqi 830011, Peoples R China 2.Univ Chinese Acad Sci, Beijing 101408, Peoples R China 3.Chinese Acad Sci, Purple Mt Observ, Nanjing 210023, Peoples R China 4.Univ Sci & Technol China, Sch Astron & Space Sci, Hefei 230026, Peoples R China 5.Chinese Acad Sci, Key Lab Radio Astron, Urumqi 830011, Peoples R China |
| 推荐引用方式 GB/T 7714 | Sun, Jingfei,Li, Xiaohu,Du, Fujun,et al. Chemical differences among collapsing low-mass protostellar cores[J]. ASTRONOMY & ASTROPHYSICS,2024,683:A76. |
| APA | Sun, Jingfei,Li, Xiaohu,Du, Fujun,Wang, Yao,Tuo, Juan,&Feng, Yanan.(2024).Chemical differences among collapsing low-mass protostellar cores.ASTRONOMY & ASTROPHYSICS,683,A76. |
| MLA | Sun, Jingfei,et al."Chemical differences among collapsing low-mass protostellar cores".ASTRONOMY & ASTROPHYSICS 683(2024):A76. |
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来源：新疆天文台
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