HR: 10:20h
AN: P32A-01    [Abstracts]
TI: The Condensation/Sublimation Front in the Solar Nebula
AU: * Davis, S S
EM: sdavis@mail.arc.nasa.gov
AF: NASA Ames Research Center, MS 245-3, Moffett Field, CA 94035 United States
AB: The condensation/sublimation front in the early solar system is investigated using analytical solutions of the nebula evolution equations. One-dimensional theory shows that the front evolves from beyond 40 AU to its final position over a period of 10 Myrs. The physical process governing this movement is a combination of local viscous heating (early in the evolution) and luminescent heating from the central star (in the later stages). The one-dimensional analysis is extended to two-dimensions using a vertical structure model of the solar nebula. This model, using a code supplied by C. P. Dullemond, computes the radial and vertical temperature-density distribution using both viscous and radiative transfer heating processes. The two-dimensional water condensation/sublimation front is computed and contrasted with that predicted by one-dimensional theory.
DE: 5704 Atmospheres--composition and chemistry
DE: 6015 Dust
DE: 6020 Ice
SC: Planetary Sciences [P]
MN: 2004 AGU Fall Meeting