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.
Original language | English |
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Article number | 1215642 |
Journal | Frontiers in Astronomy and Space Sciences |
Volume | 10 |
DOIs | |
Publication status | Published - 14 Aug 2023 |
Bibliographical note
Funding Information:XL acknowledges the support from the Xinjiang Tianchi project (2019). TM is grateful to the Leverhulme Trust for the award of an Emeritus Fellowship. This work was also funded by the National Science Foundation of China (12173023), the China Manned Space Project (CMS-CSST-2021-A09), the National Science Foundation of China (11973013), the National Key Research and Development Program of China (22022YFA1603102), the National Natural Science Foundation of China (92261101), the Innovation Capability Support Program of Shaanxi Province (2023-CX-TD-49), and the National Natural Science Foundation of China (11973075). XF, SQ, and YZ thank the Xinjiang Uygur Autonomous Region of China for their support through the Tianchi Talent Program.
Funding Information:
XL acknowledges the support from the Xinjiang Tianchi project (2019). TM is grateful to the Leverhulme Trust for the award of an Emeritus Fellowship. This work was also funded by the National Science Foundation of China (12173023), the China Manned Space Project (CMS-CSST-2021-A09), the National Science Foundation of China (11973013), the National Key Research and Development Program of China (22022YFA1603102), the National Natural Science Foundation of China (92261101), the Innovation Capability Support Program of Shaanxi Province (2023-CX-TD-49), and the National Natural Science Foundation of China (11973075). XF, SQ, and YZ thank the Xinjiang Uygur Autonomous Region of China for their support through the Tianchi Talent Program.
Publisher Copyright:
Copyright © 2023 Feng, Li, Millar, Szczerba, Wang, Quan, Qin, Fang, Tuo, Miao, Ma, Xu, Sun, Jiang, Chang, Yang, Hou, Li and Zhang.
Keywords
- AI Vol
- asymptotic giant branch stars
- C-rich
- circumstellar envelope
- II Lup
- mass loss
- RAFGL 4211
- SiC
ASJC Scopus subject areas
- Astronomy and Astrophysics