Protostars and Planets VI, Heidelberg, July 15-20, 2013
Deuterium fractionation of water in the Solar nebula
Albertsson, Tobias (Max-Planck-Institut für Astronomie)
Semenov, Dmitry (Max-Planck-Institut für Astronomie)
Henning, Thomas (Max-Planck-Institut für Astronomie)
Water evaporates in the inner regions of protoplanetary disks and is frozen onto grains in the outer regions. Therefore its presence in vast quantities on Earth is puzzling. Subsequent delivery through bombardment by primitive bodies formed in the outer icy regions is the favored mechanism. By studying water D/H ratios one hopes to understand whether the water was mainly delivered by comets or asteroids.
Using an extended deuterium chemistry network coupled to a 2D chemo-dynamical disk model, we investigate the evolution of the D/H ratio of water in the young Solar nebula. We find that both the laminar and mixing Solar nebula models show the Earth\'s ocean water D/H ratio at 2–3 AU. In addition, the 2D-mixing model explains better the water D/H values observed in the Oort- and Jupiter-family comets.
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