A proposed chemical scheme for HCCO formation in cold dense clouds

Valentine Wakelam 1 J.-C. Loison K. M. Hickson M. Ruaud 1
1 AMOR 2015
LAB - Laboratoire d'Astrophysique de Bordeaux [Pessac], UB - Université de Bordeaux, INSU - CNRS - Institut national des sciences de l'Univers , CNRS - Centre National de la Recherche Scientifique
Abstract : The ketenyl radical (HCCO) has recently been discovered in two cold dense clouds with a non-negligible abundance of a few 10-11 (compared to H2). Until now, no chemical network has been able to reproduce this observation. We propose here a chemical scheme that can reproduce HCCO abundances together with HCO, H2CCO and CH3CHO in the dark clouds Lupus-1A and L486. The main formation pathway for HCCO is the OH + CCH → HCCO + H reaction as suggested by Agúndez et al. but with a much larger rate coefficient than used in current models. Since this reaction has never been studied experimentally or theoretically, this larger value is based on a comparison with other similar systems.
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Article dans une revue
Monthly Notice- Royal Astronomical Society -Letters-, Wiley-Blackwell, 2015, 453 (1), pp.L48-L52. 〈10.1093/mnrasl/slv097〉
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https://hal.archives-ouvertes.fr/hal-01198427
Contributeur : Marie-Paule Pomies <>
Soumis le : samedi 12 septembre 2015 - 16:15:15
Dernière modification le : mercredi 27 juillet 2016 - 14:48:48

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Valentine Wakelam, J.-C. Loison, K. M. Hickson, M. Ruaud. A proposed chemical scheme for HCCO formation in cold dense clouds. Monthly Notice- Royal Astronomical Society -Letters-, Wiley-Blackwell, 2015, 453 (1), pp.L48-L52. 〈10.1093/mnrasl/slv097〉. 〈hal-01198427〉

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