Discovery of methyl silane and confirmation of silyl cyanide in IRC +10216
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 ex...
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| Veröffentlicht in: | Astronomy and astrophysics (Berlin) 2017-10, Vol.606, p.L5 |
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| creator | Cernicharo, J. Agúndez, M. Velilla Prieto, L. Guélin, M. Pardo, J. R. Kahane, C. Marka, C. Kramer, C. Navarro, S. Quintana-Lacaci, G. Fonfría, J. P. Marcelino, N. Tercero, B. Moreno, E. Massalkhi, S. Santander-García, M. McCarthy, M. C. Gottlieb, C. A. Alonso, J. L. |
| description | 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. |
| doi_str_mv | 10.1051/0004-6361/201731672 |
| format | Article |
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R. ; Kahane, C. ; Marka, C. ; Kramer, C. ; Navarro, S. ; Quintana-Lacaci, G. ; Fonfría, J. P. ; Marcelino, N. ; Tercero, B. ; Moreno, E. ; Massalkhi, S. ; Santander-García, M. ; McCarthy, M. C. ; Gottlieb, C. A. ; Alonso, J. L.</creator><creatorcontrib>Cernicharo, J. ; Agúndez, M. ; Velilla Prieto, L. ; Guélin, M. ; Pardo, J. R. ; Kahane, C. ; Marka, C. ; Kramer, C. ; Navarro, S. ; Quintana-Lacaci, G. ; Fonfría, J. P. ; Marcelino, N. ; Tercero, B. ; Moreno, E. ; Massalkhi, S. ; Santander-García, M. ; McCarthy, M. C. ; Gottlieb, C. A. ; Alonso, J. L.</creatorcontrib><description>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. 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L.</creatorcontrib><title>Discovery of methyl silane and confirmation of silyl cyanide in IRC +10216</title><title>Astronomy and astrophysics (Berlin)</title><addtitle>Astron Astrophys</addtitle><description>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.</description><subject>Abundance</subject><subject>astrochemistry</subject><subject>Astrophysics</subject><subject>Chemical speciation</subject><subject>Cyanides</subject><subject>Molecular chains</subject><subject>Organic chemistry</subject><subject>Radio telescopes</subject><subject>Rotation</subject><subject>Sciences of the Universe</subject><subject>stars: AGB and post-AGB</subject><subject>stars: carbon</subject><subject>stars: individual: IRC+10216</subject><issn>0004-6361</issn><issn>1432-0746</issn><issn>1432-0756</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2017</creationdate><recordtype>article</recordtype><recordid>eNpdkc9u1DAQxi0EokvhCZBQJC4IFOrxvyQXpLKFbmElJFTE0fI6NuuS2MVOVt0bV16TJ8HRlgh6sqz5zTcz34fQU8CvAXM4wRizUlABJwRDRUFU5B5aAKOkxBUT99FiJo7Qo5Su8pdATR-iI9IAI5TUC7Q-c0mHnYn7ItiiN8N23xXJdcqbQvm20MFbF3s1uOAnIpcyoPfKu9YUzhcXn5e_f_56BVlaPEYPrOqSeXL7HqMv799dLlfl-tP5xfJ0XWqOxVBC2zbWGsVqUVNMoeEtsY0QtW4bLeiGQ16UAuW8ZQw0NzUGojaW2RZTwTQ9Rm8OutfjpjetNn6IqpPX0fUq7mVQTv5f8W4rv4Wd5HkgZSILvDwIbO-0rU7X0vk0yjyoIayqdpDhF7fTYvgxmjTIPntmusmjMCYJjeAkiwLP6PM76FUYo89eSII5rxhpGM0UPVA6hpSisfMKgOUUrZyCk1Nwco42dz379-i552-WGSgPgEuDuZnrKn6XoqIVlzX-KpsP53glPr6Vl_QPV1SrWg</recordid><startdate>20171001</startdate><enddate>20171001</enddate><creator>Cernicharo, J.</creator><creator>Agúndez, M.</creator><creator>Velilla Prieto, L.</creator><creator>Guélin, M.</creator><creator>Pardo, J. 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P.</au><au>Marcelino, N.</au><au>Tercero, B.</au><au>Moreno, E.</au><au>Massalkhi, S.</au><au>Santander-García, M.</au><au>McCarthy, M. C.</au><au>Gottlieb, C. A.</au><au>Alonso, J. L.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Discovery of methyl silane and confirmation of silyl cyanide in IRC +10216</atitle><jtitle>Astronomy and astrophysics (Berlin)</jtitle><addtitle>Astron Astrophys</addtitle><date>2017-10-01</date><risdate>2017</risdate><volume>606</volume><spage>L5</spage><pages>L5-</pages><issn>0004-6361</issn><eissn>1432-0746</eissn><eissn>1432-0756</eissn><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. 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| source | Bacon EDP Sciences France Licence nationale-ISTEX-PS-Journals-PFISTEX; EDP Sciences Open Access Journals; EZB-FREE-00999 freely available EZB journals |
| subjects | Abundance astrochemistry Astrophysics Chemical speciation Cyanides Molecular chains Organic chemistry Radio telescopes Rotation Sciences of the Universe stars: AGB and post-AGB stars: carbon stars: individual: IRC+10216 |
| title | Discovery of methyl silane and confirmation of silyl cyanide in IRC +10216 |
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