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标题：Discovery of methyl silane and confirmation of silyl cyanide in IRC +10216
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作者：J. Cernicharo ; J. Cernicharo ; M. Agúndez 等
期刊名称：Astronomy & Astrophysics
印刷版ISSN：0004-6361
电子版ISSN：1432-0746
出版年度：2017
卷号：606
页码：1-5
DOI：10.1051/0004-6361/201731672
语种：English
出版社：EDP Sciences
摘要：We report the discovery in space of methyl silane, CH3SiH3, from observations of ten rotational transitions between 80 and 350 GHz (Ju from 4 to 16) with the IRAM 30 m radio telescope. The molecule was observed in the envelope of the C-star IRC +10216. The observed profiles and our models for the expected emission of methyl silane suggest that the it is formed in the inner zones of the circumstellar envelope, 1−40 R∗, with an abundance of (0.5−1) × 10-8 relative to H2. We also observed several rotational transitions of silyl cyanide (SiH3CN), confirming its presence in IRC +10216 in particular, and in space in general. Our models indicate that silyl cyanide is also formed in the inner regions of the envelope, around 20 R∗, with an abundance relative to H2 of 6 × 10-10. The possible formation mechanisms of both species are discussed. We also searched for related chemical species but only upper limits could be obtained.
关键词：enstars: individual: IRC+10216stars: carbonastrochemistrystars: AGB and post-AGB