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Discovery of methyl silane and confirmation of silyl cyanide in IRC +10216.


ABSTRACT: 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.

SUBMITTER: Cernicharo J 

PROVIDER: S-EPMC5683346 | biostudies-literature | 2017 Oct

REPOSITORIES: biostudies-literature

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We report the discovery in space of methyl silane, CH<sub>3</sub>SiH<sub>3</sub>, from observations of ten rotational transitions between 80 and 350 GHz (<i>J</i><sub>u</sub> 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 <i>R</i><sub>*</sub>, with an abundance of  ...[more]

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