In this Letter, we present the first results from updated models of interstellar deuterium chemistry that now include all possible deuterated isotopomers of H3+. We find that in regions of high density and heavy depletion, such as prestellar cores, the inclusion of HD2+ and D3+ enhances the fractionation of ionic and neutral species significantly. Our models are the first to predict the very high atomic D/H ratios (>=0.3) necessary for grain-surface chemistry models to reproduce the high formaldehyde and methanol fractionation seen in star-forming regions.
ASJC Scopus subject areas
- Space and Planetary Science
Roberts, H., Herbst, E., & Millar, TJ. (2003). Enhanced Deuterium Fractionation in Dense Interstellar Cores Resulting from Multiply Deuterated H3+. Astrophysical Journal, 591(1 II), L41-L44. https://doi.org/10.1086/376962