First detection of triply-deuterated methanol

B. Parise; A. Castets; E. Herbst; E. Caux; C. Ceccarelli; I. Mukhopadhyay; A. G. G. M. Tielens

doi:10.1051/0004-6361:20034490

First detection of triply-deuterated methanol

Astrophysics 2007-05-23 v1

Authors: 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+.

Keywords

triply-deuterated methanol deuteration grain surface formation column density H2 formation rate

Cite

@article{arxiv.astro-ph/0311038,
  title  = {First detection of triply-deuterated methanol},
  author = {B. Parise and A. Castets and E. Herbst and E. Caux and C. Ceccarelli and I. Mukhopadhyay and A. G. G. M. Tielens},
  journal= {arXiv preprint arXiv:astro-ph/0311038},
  year   = {2007}
}

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Accepted by A&A

First detection of triply-deuterated methanol

Abstract

Keywords

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