Journal
ASTRONOMY & ASTROPHYSICS
Volume 642, Issue -, Pages -Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361/202039274
Keywords
molecular data; line: identification; ISM: molecules; ISM: individual objects: TMC-1; stars: individual: IRC+10216
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Funding
- Ministerio de Ciencia e Innovacion [AYA2016-75066-C2-1-P, RyC-2014-16277]
- ERC [ERC-2013-Syg-610256-NANOCOSMOS]
- Juan de la Cierva [FJCI-2016-27983]
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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 C-13 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 similar to 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.
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