Kavli Affiliate: Ke Wang
| First 5 Authors: Yanan Feng, Xiaohu Li, Tom J. Millar, Ryszard Szczerba, Ke Wang
| Summary:
Whether SiC$_2$ is a parent species, that is formed in the photosphere or as
a by-product of high-temperature dust formation, or a daughter species, formed
in a chemistry driven by the photodestruction of parent species in the outer
envelope, has been debated for a long time. Here, we analyze the ALMA
observations of four SiC$_2$ transitions in the CSEs of three C-rich AGB stars
(AI Vol, II Lup, and RAFGL 4211), and found that SiC$_2$ exhibits an annular,
shell-like distribution in these targets, suggesting that SiC$_2$ can be a
daughter species in the CSEs of carbon-rich AGB stars. The results can provide
important references for future chemical models.
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