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

AuthorsCernicharo, José ; Agúndez, Marcelino ; Velilla Prieto, L. ; Guélin, M.; Pardo Carrión, Juan Ramón ; Kahane, C.; Marka, C.; Kramer, C.; Navarro, S. ; Quintana-Lacaci, G. ; Fonfría, José Pablo ; Marcelino, Nuria ; Tercero, Belén ; Moreno, Elena ; Massalkhi, S.; Santander-García, M.; McCarthy, M. C.; Gottlieb, C. A.; Alonso, J. L.
Stars: AGB and post-AGB
Stars: carbon
Stars: individual: IRC+10216
Issue DateOct-2017
PublisherEDP Sciences
CitationAstronomy and Astrophysics 606: L5 (2017)
AbstractWe report the discovery in space of methyl silane, CHSiH, from observations of ten rotational transitions between 80 and 350 GHz (J 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 relative to H. We also observed several rotational transitions of silyl cyanide (SiHCN), 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 H of 6 × 10. The possible formation mechanisms of both species are discussed. We also searched for related chemical species but only upper limits could be obtained.
Publisher version (URL)https://doi.org/10.1051/0004-6361/201731672
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