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A 3 mm molecular line survey toward IRC+10216

文献类型：期刊论文

作者Ao, Yi-Na3; Zhang, Yong2,3,6; Qiu, Jian-Jie1; Sun, Hao-Min3; Li, Xiao-Hu2,4,5
刊名ASTRONOMY & ASTROPHYSICS
出版日期2025-07-11
卷号699页码:A216
关键词stars: AGB and post-AGB circumstellar matter ISM: molecules planetary nebulae: general
ISSN号0004-6361
DOI10.1051/0004-6361/202554726
产权排序2
英文摘要Context. IRC+10216 is the brightest infrared source in the northern sky, known for its rich chemical composition. It is often used as a standard reference for studying the circumstellar envelope (CSE) of carbon-rich stars. While pioneering 3 mm spectral surveys have laid foundational datasets, their system temperature limitations rendered spectral line detection thresholds inadequate for probing the source's complex organic molecule inventory at this band, which made superseding observations necessary. Aims. We aim to gain an unbiased view regarding circumstellar chemistry and investigate whether IRC+10216 is typical or anomalous in terms of its chemical composition. Methods. We carried out an in-depth spectral line survey of the circumstellar envelope of IRC+10216 utilizing the Arizona Radio Observatory 12m telescope. We achieved complete spectral sampling across the 90-116 GHz atmospheric window (lambda = 2.6-3.3 mm). Results. A total of 214 emission lines belonging to 43 molecular species are identified in the CSE of IRC+10216, among which 28 lines are newly detected in this object and four emission lines remain unidentified. The excitation temperatures and column densities of 16 molecules are determined through rotation diagrams. We estimate the isotopic ratios of carbon, oxygen, and silicon elements. For the majority of the molecular species, the line intensity ratios between IRC+10216 and CIT 6 are inversely proportional to the square of their distance, which suggests that the chemical processes occurring within them are similar. Nevertheless, there is evidence suggesting that the emission of C4H and C3N in IRC+10216 is unusually strong. Conclusions. These observations stand as the most sensitive and unbiased line survey of IRC+10216 within the lambda = 3 window carried out by a single-dish telescope. They offer a valuable reference for the astronomical community. They can facilitate comparative studies of the circumstellar chemistry of carbon-rich evolved stars and can act as a guiding framework for sensitive interferometric molecular mappings.
WOS关键词MASS-LOSS RATE ; CIRCUMSTELLAR ENVELOPE ; ASTRONOMICAL DETECTION ; STAR IRC+10216 ; DUST SHELLS ; IRC +10216 ; AGB STARS ; CARBON ; IDENTIFICATION ; ABUNDANCES
资助项目National Natural Science Foundation of China-China Academy of General Technology Joint Fund for Basic Researchhttps://doi.org/10.13039/501100019492[12473027] ; National Natural Science Foundation of China-China Academy of General Technology Joint Fund for Basic Researchhttps://doi.org/10.13039/501100019492[12333005] ; National Natural Science Foundation of China-China Academy of General Technology Joint Fund for Basic Researchhttps://doi.org/10.13039/501100019492[11973099] ; National Natural Science Foundation of China-China Academy of General Technology Joint Fund for Basic Researchhttps://doi.org/10.13039/501100019492[12463006] ; National Natural Science Foundation of China (NSFC)[2024A1515010798] ; National Natural Science Foundation of China (NSFC)[2024B1212080003] ; 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
WOS研究方向Astronomy & Astrophysics
语种英语
WOS记录号WOS:001527131800012
出版者EDP SCIENCES S A
资助机构National Natural Science Foundation of China-China Academy of General Technology Joint Fund for Basic Researchhttps://doi.org/10.13039/501100019492 ; 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
源URL[http://ir.xao.ac.cn/handle/45760611-7/7953]  
专题天体化学研究团组
通讯作者Zhang, Yong
作者单位1.Jinggangshan Univ, Sch Math & Phys, 28 Xueyuan Rd, Jian 343009, Jiangxi, Peoples R China
2.Chinese Acad Sci, Xinjiang Astron Observ, 150 Sci 1 St, Urumqi 830011, Peoples R China
3.Sun Yat Sen Univ, Sch Phys & Astron, 2 Daxue Rd, Tangjia 519082, Zhuhai, Peoples R China
4.Chinese Acad Sci, Key Lab Radio Astron & Technol, A20 Datun Rd, Beijing 100101, Peoples R China
5.Xinjiang Key Lab Radio Astrophys, 150 Sci 1 St, Urumqi 830011, Xinjiang, Peoples R China
6.Sun Yat Sen Univ, CSST Sci Ctr, Guangdong Hongkong Macau Greater Bay Area, Guangzhou 519082, Guangdong, Peoples R China
推荐引用方式
GB/T 7714		 Ao, Yi-Na,Zhang, Yong,Qiu, Jian-Jie,et al. A 3 mm molecular line survey toward IRC+10216[J]. ASTRONOMY & ASTROPHYSICS,2025,699:A216.
APA Ao, Yi-Na,Zhang, Yong,Qiu, Jian-Jie,Sun, Hao-Min,&Li, Xiao-Hu.(2025).A 3 mm molecular line survey toward IRC+10216.ASTRONOMY & ASTROPHYSICS,699,A216.
MLA Ao, Yi-Na,et al."A 3 mm molecular line survey toward IRC+10216".ASTRONOMY & ASTROPHYSICS 699(2025):A216.

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