Institutional Repository of Radio Astronomy Research Laboratory
| A molecule-rich torus-like structure in the 21 μm source IRAS 23304+6147 | |
Sun, Hao-Min1; Zhang, Yong1,2,3 ; Ouyang, Xu-Jia1; Qin, Sheng-Li4; Nakashima, Junichi1,3; Qiu, Jian-Jie5; Li, Xiao-Hu2,6,7
| |
| 2025-04-08 | |
| Source Publication | ASTRONOMY & ASTROPHYSICS
 |
| ISSN | 0004-6361 |
| Volume | 696Pages:A102 |
| Contribution Rank | 2 |
| Abstract | 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. |
| Keyword | astrochemistry stars: AGB and post-AGB circumstellar matter ISM: molecules planetary nebulae: general radio lines: ISM |
| DOI | 10.1051/0004-6361/202452355 |
| Indexed By | SCI |
| Language | 英语 |
| WOS Keyword | ASYMPTOTIC GIANT BRANCH ; PROTOPLANETARY NEBULAE ; LINE SURVEY ; CARBON STARS ; EMISSION FEATURES ; INFRARED-SPECTRA ; CO OBSERVATIONS ; AGB ; MASS ; ENVELOPE |
| Funding Project | 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 Research Area | Astronomy & Astrophysics |
| WOS Subject | Astronomy & Astrophysics |
| WOS ID | WOS:001468811000005 |
| Publisher | EDP SCIENCES S A |
| Funding Organization | 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) |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.xao.ac.cn/handle/45760611-7/7691 |
| Collection | 射电天文研究室_天体化学研究团组 |
| Corresponding Author | Zhang, Yong |
| Affiliation | 1.Sun Yat Sen Univ, Sch Phys & Astron, 2 Daxue Rd, Zhuhai 519082, Guangdong, Peoples R China 2.Chinese Acad Sci, Xinjiang Astron Observ, 150 Sci 1 St, Urumqi 830011, Peoples R China 3.Sun Yat Sen Univ, CSST Sci Ctr Guangdong Hongkong Macau Greater Bay, Zhuhai, Guangdong, Peoples R China 4.Yunnan Univ, Sch Phys & Astron, Kunming 650091, Peoples R China 5.Jinggangshan Univ, Sch Math & Phys, 28 Xueyuan Rd, Jian 343009, Jiangxi, Peoples R China 6.Xinjiang Key Lab Radio Astrophys, 150 Sci 1 St, Urumqi 830011, Xinjiang, Peoples R China 7.Chinese Acad Sci, Key Lab Radio Astron & Technol, A20 Datun Rd, Beijing 100101, Peoples R China |
| Corresponding Author Affilication | Xinjiang Astronomical Observatory, Chinese Academy of Sciences |
| Recommended Citation 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. |
| Files in This Item: | ||||||
| File Name/Size | DocType | Version | Access | License | ||
| Sun-2025-A molecule-（20805KB） | 期刊论文 | 出版稿 | 开放获取 | CC BY-NC-SA | View Application Full Text | |
Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.
Edit Comment