A&A 416, 159-163 (2004)
DOI: 10.1051/0004-6361:20034490

First detection of triply-deuterated methanol

B. Parise¹, A. Castets², E. Herbst³, E. Caux¹, C. Ceccarelli⁴, I. Mukhopadhyay⁵ and A. G. G. M. Tielens<sup>6

1</sup>  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

(Received 7 August 2003 / Accepted 3 November 2003)

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⁺.

Key words: ISM: abundances -- ISM: molecules -- stars: formation -- ISM: individual: IRAS 16293-2422

Offprint request: B. Parise, Berengere.Parise@cesr.fr

SIMBAD Objects

© ESO 2004

The OpenURL standard is a protocol for transmission of metadata describing the resource that you wish to access. An OpenURL link contains article metadata and directs it to the OpenURL server of your choice. The OpenURL server can provide access to the resource and also offer complementary services (specific search engine, export of references...). The OpenURL link can be generated by different means.

• If your librarian has set up your subscription with an OpenURL resolver, OpenURL links appear automatically on the abstract pages.
• You can define your own OpenURL resolver with your EDPS Account. In this case your choice will be given priority over that of your library.
• You can use an add-on for your browser (Firefox or I.E.) to display OpenURL links on a page (see http://www.openly.com/openurlref/). You should disable this module if you wish to use the OpenURL server that you or your library have defined.