Deuterium Fractionation in Protoplanetary Disks

Details Deuterium Fractionation in Protoplanetary Disks Deuterium Fractionation in Protoplanetary Disks

Aug 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999pcim.conf..403a&link_type=abstract

The Physics and Chemistry of the Interstellar Medium, Proceedings of the 3rd Cologne-Zermatt Symposium, held in Zermatt, Septemb

Physics

Scientific paper

We investigate the chemistry of deuterium-bearing molecules in outer regions of protoplanetary disks, where comets may form. We find that molecules formed in the disk have higher D/H ratios than the elemental D/H ratio in solar abundance, which is consistent with observations of recent comets. Despite the higher densities in protoplanetary disks, deuterium fractionation occurs in a similar way as in molecular clouds.; because of the differences in zero-point energies and the existence of rapid ion-molecule isotopic exchange reactions, species such as H _3^+ have high D/H ratios, which propagate to other molecules via gas-phase chemical reactions. Our results sugget that the high D/H ratios observed in comets do not necessarily mean the interstellar origin of cometary matter, and that cometary matter is a mixture of interstellar matter and matter which is processed in the outer regions of disks.

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