Frontiers in Astronomy and Space Sciences (Aug 2023)
Photochemical origin of SiC2 in the circumstellar envelope of carbon-rich AGB stars revealed by ALMA
- Yanan Feng,
- Yanan Feng,
- Xiaohu Li,
- Xiaohu Li,
- Tom J. Millar,
- Ryszard Szczerba,
- Ke Wang,
- Donghui Quan,
- Donghui Quan,
- Shengli Qin,
- Shengli Qin,
- Xuan Fang,
- Xuan Fang,
- Xuan Fang,
- Xuan Fang,
- Juan Tuo,
- Juan Tuo,
- Zhenzhen Miao,
- Rong Ma,
- Rong Ma,
- Fengwei Xu,
- Fengwei Xu,
- Jingfei Sun,
- Biwei Jiang,
- Biwei Jiang,
- Qiang Chang,
- Jianchao Yang,
- Jianchao Yang,
- Gao-Lei Hou,
- Fangfang Li,
- Yong Zhang,
- Yong Zhang,
- Yong Zhang
Affiliations
- Yanan Feng
- Xinjiang Astronomical Observatory, Chinese Academy of Sciences, Urumqi, China
- Yanan Feng
- School of Astronomy and Space Science, University of the Chinese Academy of Sciences, Beijing, China
- Xiaohu Li
- Xinjiang Astronomical Observatory, Chinese Academy of Sciences, Urumqi, China
- Xiaohu Li
- Key Laboratory of Radio Astronomy, Chinese Academy of Sciences, Urumqi, China
- Tom J. Millar
- Astrophysics Research Centre, School of Mathematics and Physics, Queen’s University Belfast, Belfast, United Kingdom
- Ryszard Szczerba
- Nicolaus Copernicus Astronomical Center, Polish Academy of Sciences, Warsaw, Poland
- Ke Wang
- The Kavli Institute for Astronomy and Astrophysics at Peking University (KIAA-PKU), Beijing, China
- Donghui Quan
- Xinjiang Astronomical Observatory, Chinese Academy of Sciences, Urumqi, China
- Donghui Quan
- Research Center for Intelligent Computing Platforms, Zhejiang Laboratory, Hang Zhou, China
- Shengli Qin
- Xinjiang Astronomical Observatory, Chinese Academy of Sciences, Urumqi, China
- Shengli Qin
- Department of Astronomy, Yunnan University, Kunming, China
- Xuan Fang
- Xinjiang Astronomical Observatory, Chinese Academy of Sciences, Urumqi, China
- Xuan Fang
- National Astronomical Observatories, Chinese Academy of Sciences, Beijing, China
- Xuan Fang
- 0Department of Physics, Faculty of Science, The University of Hong Kong, Hang Zhou, China
- Xuan Fang
- 1Laboratory for Space Research, Faculty of Science, The University of Hong Kong, Hang Zhou, China
- Juan Tuo
- Xinjiang Astronomical Observatory, Chinese Academy of Sciences, Urumqi, China
- Juan Tuo
- School of Astronomy and Space Science, University of the Chinese Academy of Sciences, Beijing, China
- Zhenzhen Miao
- Xinjiang Astronomical Observatory, Chinese Academy of Sciences, Urumqi, China
- Rong Ma
- Xinjiang Astronomical Observatory, Chinese Academy of Sciences, Urumqi, China
- Rong Ma
- School of Astronomy and Space Science, University of the Chinese Academy of Sciences, Beijing, China
- Fengwei Xu
- The Kavli Institute for Astronomy and Astrophysics at Peking University (KIAA-PKU), Beijing, China
- Fengwei Xu
- 2Department of Astronomy at Peking University (DoA-PKU), Beijing, China
- Jingfei Sun
- Xinjiang Astronomical Observatory, Chinese Academy of Sciences, Urumqi, China
- Biwei Jiang
- 3Institute for Frontiers in Astronomy and Astrophysics, Beijing Normal University, Beijing, China
- Biwei Jiang
- 4Department of Astronomy, Beijing Normal University, Beijing, China
- Qiang Chang
- 5School of Physics and Optoelectronic Engineering, Shandong University of Technology, Zibo, China
- Jianchao Yang
- Xinjiang Astronomical Observatory, Chinese Academy of Sciences, Urumqi, China
- Jianchao Yang
- School of Astronomy and Space Science, University of the Chinese Academy of Sciences, Beijing, China
- Gao-Lei Hou
- 6MOE Key Laboratory for Non-Equilibrium Synthesis and Modulation of Condensed Matter, School of Physics, Xi’an Jiaotong University, Xi’an, China
- Fangfang Li
- Xinjiang Astronomical Observatory, Chinese Academy of Sciences, Urumqi, China
- Yong Zhang
- Xinjiang Astronomical Observatory, Chinese Academy of Sciences, Urumqi, China
- Yong Zhang
- 1Laboratory for Space Research, Faculty of Science, The University of Hong Kong, Hang Zhou, China
- Yong Zhang
- 7School of Physics and Astronomy, Sun Yat-sen University, Guangzhou, China
- DOI
- https://doi.org/10.3389/fspas.2023.1215642
- Journal volume & issue
-
Vol. 10
Abstract
The fact that whether SiC2 is a parent species, formed in the photosphere or as a by-product of high-temperature dust formation, or a daughter species, formed in chemistry driven by the photodestruction of the parent species in the outer envelope, has been debated for a long time. In this study, we analyze the Atacama Large Millimeter Array (ALMA) observations of four SiC2 transitions in the circumstellar envelopes (CSEs) of three C-rich asymptotic giant branch (AGB) stars (AI Vol, II Lup, and RAFGL 4211) and find that SiC2 exhibits an annular, shell-like distribution in these targets, suggesting that SiC2 can be a daughter species in the CSEs of carbon-rich AGB stars. The results may provide important references for future chemical models.
Keywords
