Discovery of methyl silane and confirmation of silyl cyanide in IRC +10216
| Autor: | C. Marka, M. Guelin, E Moreno, José L. Alonso, José Cernicharo, Marcelino Agúndez, Claudine Kahane, Carl A. Gottlieb, Michael C. McCarthy, Nuria Marcelino, José Pablo Fonfría, S. Navarro, G. Quintana-Lacaci, L. Velilla Prieto, Juan R. Pardo, C. Kramer, Belén Tercero, M. Santander-García, S. Massalkhi |
|---|---|
| Přispěvatelé: | European Research Council, Ministerio de Ciencia e Innovación (España), Ministerio de Economía y Competitividad (España) |
| Rok vydání: | 2017 |
| Předmět: |
Astrochemistry
Silylation Cyanide Astrophysics 01 natural sciences Article chemistry.chemical_compound 0103 physical sciences Molecule 010303 astronomy & astrophysics Stars: individual: IRC+10216 Envelope (waves) Physics 010308 nuclear & particles physics Stars: AGB and post-AGB individual: IRC+10216 [Stars] Astronomy and Astrophysics Circumstellar envelope AGB and post-AGB [Stars] Silane 3. Good health Chemical species Stars: carbon chemistry 13. Climate action Space and Planetary Science carbon [Stars] |
| Zdroj: | Digital.CSIC. Repositorio Institucional del CSIC instname |
| Popis: | We 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. We acknowledge funding support from Spanish MINECO under grants AYA2012-32032, AYA2016-75066-C2-1-P, and CSD2009-00038, and from the European Research Council under grant ERC-2013-SyG 610256 (NANOCOSMOS). |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|