Photochemical origin of SiC2 in the circumstellar envelope of carbon-rich AGB stars revealed by ALMA

Feng, Yanan and Li, Xiaohu and Millar, Tom J. and Szczerba, Ryszard and Wang, Ke and Quan, Donghui and Qin, Shengli and Fang, Xuan and Tuo, Juan and Miao, Zhenzhen and Ma, Rong and Xu, Fengwei and Sun, Jingfei and Jiang, Biwei and Chang, Qiang and Yang, Jianchao and Hou, Gao-Lei and Li, Fangfang and Zhang, Yong (2023) Photochemical origin of SiC2 in the circumstellar envelope of carbon-rich AGB stars revealed by ALMA. Frontiers in Astronomy and Space Sciences, 10. ISSN 2296-987X

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Official URL: https://doi.org/10.3389/fspas.2023.1215642

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.

Item Type:	Article
Subjects:	Science Repository > Physics and Astronomy
Depositing User:	Managing Editor
Date Deposited:	03 Nov 2023 03:56
Last Modified:	03 Nov 2023 03:56
URI:	http://research.manuscritpub.com/id/eprint/3332

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