The sulphur saga in TMC-1: Discovery of HCSCN and HCSCCH
| Autor: | Nuria Marcelino, Carlos Cabezas, Marcelino Agúndez, José Cernicharo, P. de Vicente, Belén Tercero, Yasuki Endo, Juan R. Pardo |
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| Přispěvatelé: | European Commission, Ministerio de Economía y Competitividad (España), Ministerio de Ciencia, Innovación y Universidades (España), Ministry of Science and Technology (Taiwan) |
| Rok vydání: | 2021 |
| Předmět: |
Astrochemistry
Line: identification Radical Formaldehyde FOS: Physical sciences chemistry.chemical_element Astrophysics 01 natural sciences Medicinal chemistry Article chemistry.chemical_compound Abundance (ecology) 0103 physical sciences Molecule identification [Line] ISM: individual objects: TMC-1 010303 astronomy & astrophysics molecules [ISM] Line (formation) Physics 010304 chemical physics Molecular data Astronomy and Astrophysics Astrophysics - Astrophysics of Galaxies Propynal Sulfur ISM: molecules individual objects: TMC-1 [ISM] chemistry Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) |
| Zdroj: | Digital.CSIC. Repositorio Institucional del CSIC instname Astron Astrophys |
| ISSN: | 1432-0746 0004-6361 |
| DOI: | 10.1051/0004-6361/202141297 |
| Popis: | 8 pags., 8 figs., 5 tabs. We report the detection, for the first time in space, of cyano thioformaldehyde (HCSCN) and propynethial (HCSCCH) towards the starless core TMC-1. Cyano thioformaldehyde presents a series of prominent a- and b-type lines, which are the strongest previously unassigned features in our Q-band line survey of TMC-1. Remarkably, HCSCN is four times more abundant than cyano formaldehyde (HCOCN). On the other hand, HCSCCH is five times less abundant than propynal (HCOCCH). Surprisingly, we find an abundance ratio HCSCCH/HCSCN of ∼0.25, in contrast with most other ethynyl-cyanide pairs of molecules for which the CCH-bearing species is more abundant than the CN-bearing one. We discuss the formation of these molecules in terms of neutral-neutral reactions of S atoms with CH2CCH and CH2CN radicals as well as of CCH and CN radicals with H2CS. The calculated abundances for the sulphur-bearing species are, however, significantly below the observed values, which points to an underestimation of the abundance of atomic sulphur in the model or to missing formation reactions, such as ion-neutral reactions. This research has been funded by ERC through grant ERC-2013-Syg-610256-NANOCOSMOS. Authors also thank Ministerio de Ciencia e Innovación (Spain) for funding support through projects AYA2016-75066-C2-1-P, PID2019-106235GB-I00 and PID2019-107115GBC21/AEI/10.13039/501100011033. MA thanks Ministerio de Ciencia e Innovación for grant RyC-2014-16277. YE thanks Ministry of Science and Technology, Taiwan, for grant No. MOST 108-2113-M-009-025 and MOST 108- 2811-M-009-520. |
| Databáze: | OpenAIRE |
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