Volume 416, Number 1, March II 2004
|Page(s)||159 - 163|
|Section||Interstellar and circumstellar matter|
|Published online||26 February 2004|
First detection of triply-deuterated methanol
CESR CNRS-UPS, BP 4346, 31028 Toulouse Cedex 04, France
2 Observatoire de Bordeaux, BP 89, 33270 Floirac, France
3 Department of Physics, The Ohio State University, 174 W. 18th Ave. Columbus, OH 43210-1106, USA
4 Laboratoire d'Astrophysique, Observatoire de Grenoble, BP 53, 38041 Grenoble Cedex 09, France
5 Dakota State University, 820 N. Washington Ave., Madison, SD 57042, USA
6 SRON, PO Box 800, 9700 AV Groningen, The Netherlands
Corresponding author: B. Parise, Berengere.Parise@cesr.fr
Accepted: 3 November 2003
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 13CH3OH, used to derive the column density of the main isotopomer CH3OH. The derived fractionation ratio [ CD3OH] /[ CH3OH] averaged on a 10'' beam is 1.4%. Together with previous CH2DOH and CHD2OH observations, the present CD3OH 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.
Key words: ISM: abundances / ISM: molecules / stars: formation / ISM: individual: IRAS 16293-2422
© ESO, 2004
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