First detection of triply-deuterated methanol

Parise, Berengere, Castets, A., Herbst, E., Caux, E., Ceccarelli, C., Mukhopadhyay, I. and Tielens, A. G. G. M. 2004. First detection of triply-deuterated methanol. Astronomy and Astrophysics 416 (1) , pp. 159-163. 10.1051/0004-6361:20034490

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Abstract

We report the first detection of triply-deuterated methanol, with 12 observed transitions, towards the low-mass protostar IRAS 16293-2422, as well as multifrequency observations of 13CH 3OH, used to derive the column density of the main isotopomer CH 3OH. The derived fractionation ratio [ CD 3OH] /[ CH 3OH] averaged on a 10 '' beam is 1.4%. Together with previous CH 2DOH and CHD 2OH observations, the present CD 3OH observations are consistent with a formation of methanol on grain surfaces, if the atomic D/H ratio is 0.1 to 0.3 in the accreting gas. Such a high atomic ratio can be reached in the framework of gas-phase chemical models including all deuterated isotopomers of H 3+.

Item Type:	Article
Status:	Published
Schools:	Physics and Astronomy
Subjects:	Q Science > QB Astronomy
Uncontrolled Keywords:	ISM: abundances; ISM: molecules; stars: formation; ISM: individual: IRAS 16293-2422
Additional Information:	Pdf uploaded in accordance with publisher's policy at http://www.sherpa.ac.uk/romeo/issn/0004-6361/ (accessed 17/04/2014)
Publisher:	EDP Sciences
ISSN:	0004-6361
Date of First Compliant Deposit:	30 March 2016
Last Modified:	20 May 2023 11:34
URI:	https://orca.cardiff.ac.uk/id/eprint/52830

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