Volume 652, August 2021
|Number of page(s)||7|
|Section||Letters to the Editor|
|Published online||18 August 2021|
Letter to the Editor
Discovery of benzyne, o-C6H4, in TMC-1 with the QUIJOTE line survey⋆
Grupo de Astrofísica Molecular, Instituto de Física Fundamental (IFF-CSIC), C/ Serrano 121, 28006 Madrid, Spain
2 Department of Chemistry, University of Hawaii at Manoa, Honolulu, HI 96822, USA
3 Centro de Desarrollos Tecnológicos, Observatorio de Yebes (IGN), 19141 Yebes, Guadalajara, Spain
4 Observatorio Astronómico Nacional (OAN, IGN), Madrid, Spain
Accepted: 30 July 2021
We report the detection, for the first time in space, of a new non-functionalised hydrocarbon cycle in the direction of TMC-1: o-C6H4 (ortho-benzyne). We derive a column density for this hydrocarbon cycle of (5.0 ± 1.0) × 1011 cm−2. The abundance of this species is around 30 times lower than that of cyclopentadiene and indene. We compare the abundance of benzyne with that of other pure hydrocarbons, cycles or chains, and find that it could be formed from neutral-radical reactions such as C2H + CH2CHCCH and C + C5H5, and possibly through C4H + C2H4, C3H + CH2CCH2, and C3H2 + C3H3. Hence, the rich content of hydrocarbon cycles observed in TMC-1 could arise through a bottom-up scenario involving reactions of a few radicals with the abundant hydrocarbons recently revealed by the QUIJOTE line survey.
Key words: molecular data / line: identification / ISM: molecules / ISM: individual objects: TMC-1 / astrochemistry
© ESO 2021
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