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Título: | Pure hydrocarbon cycles in TMC-1: Discovery of ethynyl cyclopropenylidene, cyclopentadiene, and indene |
Autor: | Cernicharo, José CSIC ORCID ; Agúndez, Marcelino CSIC ORCID; Cabezas, Carlos CSIC ORCID; Tercero, Belén CSIC ORCID; Marcelino, Nuria CSIC ORCID; Pardo Carrión, Juan Ramón CSIC ORCID ; Vicente, P. de | Palabras clave: | Molecular data Line: identification ISM: molecules ISM: individual objects: TMC-1 Astrochemistry |
Fecha de publicación: | 13-may-2021 | Editor: | EDP Sciences | Citación: | Astronomy and Astrophysics 649: L15 (2021) | Resumen: | We report the detection for the first time in space of three new pure hydrocarbon cycles in TMC-1: c-C3HCCH (ethynyl cyclopropenylidene), c-C5H6 (cyclopentadiene), and c-C9H8 (indene). We derive a column density of 3.1 × 1011 cm-2 for the first cycle and similar values, in the range (1-2) × 1013 cm-2, for the second and third. This means that cyclopentadiene and indene, in spite of their large size, are exceptionally abundant, only a factor of five less abundant than the ubiquitous cyclic hydrocarbon c-C3H2. The high abundance found for these two hydrocarbon cycles together with the high abundance previously found for the propargyl radical (CH2CCH) and other hydrocarbons, such as vinyl and allenyl acetylene (Agúndez et al. 2021, A&A, 647, L10; Cernicharo et al. 2021a, A&A, 647, L2; Cernicharo et al. 2021b, A&A, 647, L3), start to allow us to quantify the abundant content of hydrocarbon rings in cold dark clouds and to identify the intermediate species that are probably behind the in situ bottom-up synthesis of aromatic cycles in these environments. While c-C3HCCH is most likely formed through the reaction between the radical CCH and c-C3H2, the high observed abundances of cyclopentadiene and indene are difficult to explain through currently proposed chemical mechanisms. Further studies are needed to identify how five- and six-membered rings are formed under the cold conditions of a cloud such as TMC-1. | Descripción: | 12 pags., 7 figs., 3 tabs. | Versión del editor: | http://dx.doi.org/10.1051/0004-6361/202141156 | URI: | http://hdl.handle.net/10261/258189 | DOI: | 10.1051/0004-6361/202141156 | Identificadores: | doi: 10.1051/0004-6361/202141156 issn: 1432-0746 |
Aparece en las colecciones: | (CFMAC-IFF) Artículos |
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Pure hydrocarbon cycles.pdf | 2,04 MB | Adobe PDF | Visualizar/Abrir |
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