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A molecule-rich torus-like structure in the 21 μm source IRAS 23304+6147

文献类型：期刊论文

作者Sun, Hao-Min6; Zhang, Yong1,2,6; Ouyang, Xu-Jia6; Qin, Sheng-Li3; Nakashima, Junichi2,6; Qiu, Jian-Jie4; Li, Xiao-Hu1,5,7
刊名ASTRONOMY & ASTROPHYSICS
出版日期2025-04-08
卷号696页码:A102
关键词astrochemistry stars: AGB and post-AGB circumstellar matter ISM: molecules planetary nebulae: general radio lines: ISM
ISSN号0004-6361
DOI10.1051/0004-6361/202452355
产权排序2
英文摘要Context. A long-standing enigma in observational astronomy is the identification of the so-called 21 mu m feature in a subset of envelopes of post-asymptotic giant branch (post-AGB) stars. Identifying this transient feature is important for understanding the chemical processes during the brief post-AGB phase and the enrichment of the interstellar medium. Understanding the structures and chemical environments of these objects is a prerequisite for this endeavor. Aims. We investigate the structure of the circumstellar envelope and the spatial distribution of gas-phase molecules in the 21 mu m source IRAS 23304+6147 with the aim to explore the potential physicochemical conditions required for the emergence of the 21 mu m feature. Methods. Molecular line observations toward IRAS 23304+6147 at the 1.3 mm band were performed using the Northern Extended Millimeter Array. A morpho-kinematic model was built to reproduce the observed (CO)-C-13 images and to decipher the structures of the nebula. Results. The imaging results reveal an elliptically elongated shell with an equatorial density enhancement (or a torus-like structure), which shows in detail how the various molecules are distributed in the envelope. The nebular morphology indicates a binary system in which the ultraviolet radiation from the companion might trigger photochemistry in the inner regions. The torus-like structure exhibits an enrichment of linear carbon-chain molecules and a depletion of silicon-bearing molecules. This nebula has a lower mass limit of 1.3 x 10(-2) M-circle dot and might exhibit a low (CO)-C-12/(CO)-C-13 abundance ratio. Conclusions. The chemically stratified structure of (CN)-C-13, HC3N, and C4H represents observational evidence of the internal radiation that initiates photochemistry. The carbon-rich torus-like structure probably offers a conducive environment for the formation of dust and complex molecules that are part of the rare 21 mu m emission. We hypothesize that the 21 mu m sources probably descend from J-type carbon stars via a binary evolutionary channel.
WOS关键词ASYMPTOTIC GIANT BRANCH ; PROTOPLANETARY NEBULAE ; LINE SURVEY ; CARBON STARS ; EMISSION FEATURES ; INFRARED-SPECTRA ; CO OBSERVATIONS ; AGB ; MASS ; ENVELOPE
资助项目National Natural Science Foundation of Chinahttp://dx.doi.org/10.13039/501100001809[12473027] ; National Natural Science Foundation of Chinahttp://dx.doi.org/10.13039/501100001809[12333005] ; National Natural Science Foundation of Chinahttp://dx.doi.org/10.13039/501100001809[11973099] ; National Natural Science Foundation of China (NSFC)[2024A1515010798] ; Guangdong Basic and Applied Basic Research Funding[CMS- CSST-2021-A09] ; Guangdong Basic and Applied Basic Research Funding[CMS-CSST-2021-A10] ; China Manned Space Project[2023] ; Xinjiang Tianchi Talent Program[2024D01E37] ; Natural Science Foundation of Xinjiang Uygur Autonomous Region[12473025] ; National Science Foundation of China ; INSU/CNRS (France) ; MPG (Germany) ; IGN (Spain)
WOS研究方向Astronomy & Astrophysics
语种英语
WOS记录号WOS:001468811000005
出版者EDP SCIENCES S A
资助机构National Natural Science Foundation of Chinahttp://dx.doi.org/10.13039/501100001809 ; National Natural Science Foundation of China (NSFC) ; Guangdong Basic and Applied Basic Research Funding ; China Manned Space Project ; Xinjiang Tianchi Talent Program ; Natural Science Foundation of Xinjiang Uygur Autonomous Region ; National Science Foundation of China ; INSU/CNRS (France) ; MPG (Germany) ; IGN (Spain)
源URL[http://ir.xao.ac.cn/handle/45760611-7/7690]  
专题天体化学研究团组
通讯作者Zhang, Yong
作者单位1.Chinese Acad Sci, Xinjiang Astron Observ, 150 Sci 1 St, Urumqi 830011, Peoples R China
2.Sun Yat Sen Univ, CSST Sci Ctr Guangdong Hongkong Macau Greater Bay, Zhuhai, Guangdong, Peoples R China
3.Yunnan Univ, Sch Phys & Astron, Kunming 650091, Peoples R China
4.Jinggangshan Univ, Sch Math & Phys, 28 Xueyuan Rd, Jian 343009, Jiangxi, Peoples R China
5.Xinjiang Key Lab Radio Astrophys, 150 Sci 1 St, Urumqi 830011, Xinjiang, Peoples R China
6.Sun Yat Sen Univ, Sch Phys & Astron, 2 Daxue Rd, Zhuhai 519082, Guangdong, Peoples R China
7.Chinese Acad Sci, Key Lab Radio Astron & Technol, A20 Datun Rd, Beijing 100101, Peoples R China
推荐引用方式
GB/T 7714		 Sun, Hao-Min,Zhang, Yong,Ouyang, Xu-Jia,et al. A molecule-rich torus-like structure in the 21 μm source IRAS 23304+6147[J]. ASTRONOMY & ASTROPHYSICS,2025,696:A102.
APA Sun, Hao-Min.,Zhang, Yong.,Ouyang, Xu-Jia.,Qin, Sheng-Li.,Nakashima, Junichi.,...&Li, Xiao-Hu.(2025).A molecule-rich torus-like structure in the 21 μm source IRAS 23304+6147.ASTRONOMY & ASTROPHYSICS,696,A102.
MLA Sun, Hao-Min,et al."A molecule-rich torus-like structure in the 21 μm source IRAS 23304+6147".ASTRONOMY & ASTROPHYSICS 696(2025):A102.

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