First detection of triply-deuterated methanol

Details First detection of triply-deuterated methanol First detection of triply-deuterated methanol

2003-11-03

arxiv.org/abs/astro-ph/0311038v1

Astronomy and Astrophysics 416 (2004) 159-163

Astronomy and Astrophysics

Astrophysics

Accepted by A&A

Scientific paper

10.1051/0004-6361:20034490

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 frame of gas-phase chemical models including all deuterated isotopomers of H3+.

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