H-D Substitution in Interstellar Solid Methanol: A Key Route for D Enrichment

Details H-D Substitution in Interstellar Solid Methanol: A Key Route for D Enrichment H-D Substitution in Interstellar Solid Methanol: A Key Route for D Enrichment

2005-03-28

arxiv.org/abs/astro-ph/0503587v1

Astrophys.J. 624 (2005) L29-L32

Astronomy and Astrophysics

Astrophysics

4 pages, 4 figures, Accepted to the ApJL

Scientific paper

10.1086/430304

Deuterium enrichment of interstellar methanol is reproduced experimentally for the first time via grain-surface H-D substitution in solid methanol at an atomic D/H ratio of 0.1. Although previous gas-grain models successfully reproduce the deuterium enrichments observed in interstellar methanol molecules (D/H of up to 0.4, compared to the cosmic ratio of $\sim 10^{-5})$, the models exclusively focus on deuterium fractionation resulting from the successive addition of atomic hydrogen/deuterium on CO. The mechanism proposed here represents a key route for deuterium enrichment that reproduces the high observed abundances of deuterated methanol, including multiple deuterations.

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