Astronomy and Astrophysics – Astronomy
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007apj...660.1580d&link_type=abstract
The Astrophysical Journal, Volume 660, Issue 2, pp. 1580-1587.
Astronomy and Astrophysics
Astronomy
7
Stars: Planetary Systems: Formation, Stars: Planetary Systems: Protoplanetary Disks
Scientific paper
Gas to solid phase changes of abundant species in a viscous, irradiated protoplanetary disk are investigated using a new formulation for the freezeout effect. The method is based on a procedure using species-dependent phase diagrams while following the chemical evolution of water and carbon monoxide gas until their partial pressures are sufficient to de-sublimate vapor into ice. It is found that water ice is dominant throughout the nebula while a significant amount of water vapor coexists with the ice in the cooler parts of the inner nebula. Volatile CO molecules de-sublimate only in the colder outer regions of the nebula near the center plane. Computed column densities for CO gas are compared with similar calculations using an adsorption/desorption model by Aikawa and Herbst and are shown to predict similar distributions.
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