Physics
Scientific paper
Aug 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999icar..140..446l&link_type=abstract
Icarus, Volume 140, Issue 2, pp. 446-450 (1999).
Physics
6
Scientific paper
The isotopic enrichment of HDO over H2O when water vapor freezes into ice at 60-170 K was studied experimentally. No such enrichment was detected (1.003-1.007 in the 95% confidence interval). Thus HDO cannot be enriched when ice is formed by freezing of water vapor. The very similar D/H ratio in the water of Comets Halley, Hyakutake, and Hale-Bopp (~3 × 10-4) is 10-20 times larger then the D/H ratio in the solar nebula. Therefore the cometary water had to originate in a giant molecular cloud, where the HDO is enriched by ion-molecule reactions. We cannot determine whether the ice grains which agglomerated into these comets were formed in a ~50 K warm clump in the giant molecular cloud and settled intact to the solar nebula or sublimated and refroze in the ~50 K Uranus-Neptune region. The HDO/H2O ratio in Earth's oceans suggests that the water was delivered by both comets and rocky material formed in Earth's region of the solar nebula.
Bar-Nun Akiva
Laufer Diana
Notesco Gila
Owen Theodore
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