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First detection of triply-deuterated methanol

B. Parise·A. Castets·E. Herbst·E. Caux·C. Ceccarelli·I. Mukhopadhyay·A. G. G. M. Tielens
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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 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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B. Parise, A. Castets, E. Herbst, E. Caux, C. Ceccarelli, I. Mukhopadhyay, A. G. G. M. Tielens. 2003-11-03. First detection of triply-deuterated methanol. https://doi.org/10.1051/0004-6361%3A20034490

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