Discovery of HC4NC in TMC-1: A study of the isomers of HC3N, HC5N, and HC7N
| Autor: | Marcelino Agúndez, Juan R. Pardo, José Cernicharo, Nuria Marcelino, Celina Bermúdez, Carlos Cabezas, Belén Tercero |
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| Přispěvatelé: | Ministerio de Economía y Competitividad (España), European Commission |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Astrochemistry
Line: identification FOS: Physical sciences Astrophysics 01 natural sciences Radio telescope Abundance (ecology) Metastability 0103 physical sciences Isotopologue identification [Line] 010306 general physics ISM: individual objects: TMC-1 010303 astronomy & astrophysics molecules [ISM] Stars: individual: IRC+10216 Physics Molecular data individual: IRC+10216 [Stars] Astronomy and Astrophysics Astrophysics - Astrophysics of Galaxies ISM: molecules 3. Good health individual objects: TMC-1 [ISM] Deuterium 13. Climate action Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) |
| Zdroj: | Digital.CSIC. Repositorio Institucional del CSIC instname |
| Popis: | 11 pags., 7 figs., 8 tabs. We present a study of the isocyano isomers of the cyanopolyynes HC3N, HC5N, and HC7N in TMC-1 and IRC+10216 carried out with the Yebes 40m radio telescope. This study has enabled us to report the detection, for the first time in space, of HCCCCNC in TMC-1 and to give upper limits for HC6NC in the same source. In addition, the deuterated isotopologues of HCCNC and HNCCC were detected, along with all 13C substitutions of HCCNC, also for the first time in space. The abundance ratios of HC3N and HC5N, with their isomers, are very different in TMC-1 and IRC+10216, namely, N(HC5N)/N(HC4NC) is ∼300 and ≥2100, respectively. We discuss the chemistry of the metastable isomers of cyanopolyynes in terms of the most likely formation pathways and by comparing observational abundance ratios between different sources. The Spanish authors thank Ministerio de Ciencia e Innovación for funding support through project AYA2016-75066-C2-1-P. We also thank ERC for funding through grant ERC-2013-Syg-610256-NANOCOSMOS. MA and CB thanks Ministerio de Ciencia e Innovación for Ramón y Cajal grant RyC-2014-16277 and Juan de la Cierva grant FJCI-2016-27983. |
| Databáze: | OpenAIRE |
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