Planetesimal Formation by Sublimation of Icy Dust Aggregates: effect of H2O vapor pressure

Details Planetesimal Formation by Sublimation of Icy Dust Aggregates: effect of H2O vapor pressure Planetesimal Formation by Sublimation of Icy Dust Aggregates: effect of H2O vapor pressure

Aug 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aipc.1158..261s&link_type=abstract

EXOPLANETS AND DISKS: THEIR FORMATION AND DIVERSITY: Proceedings of the International Conference. AIP Conference Proceedings, V

Physics

Interstellar Dust Grains, Diffuse Emission, Infrared Cirrus, Origin And Evolution, Accretion And Accretion Disks

Scientific paper

Planetesimal formation is still one of the most important unresolved problems in planetary science. In this study, I propose a scenario for planetesimal formation. Sublimation of H2O ice in an icy dust aggregate leads to the concentration of silicate dust core particles at a particular heliocentric distance. I show that the dust column density can reach the critical density required for the self-gravitational instability of the dust layer. The dust surface density increases locally by a factor of 10 in 6,000 years for 10 cm-sized aggregates. The timescale is shortened by the sublimated H2O vapor.

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