Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004dps....36.4404t&link_type=abstract
American Astronomical Society, DPS meeting #36, #44.04; Bulletin of the American Astronomical Society, Vol. 36, p.1176
Astronomy and Astrophysics
Astronomy
Scientific paper
A significant fraction of stars forming today are born in dense OB associations such as Orion. Photo-evaporation by the UV radiation of nearby O and B stars can destroy disks around low-mass stars on 105-10^6 yr time-scales. Therefore, it has been suggested that the formation of planets may be difficult in OB associations.
We have developed a disk evolution model which includes photo-evaporation, grain growth, and vertical sedimentation. Solid material condenses to the midplane as in the model of Sekiya (1998). When this disk is exposed to UV radiation, the dust-depleted outer gas layers are removed, leaving behind higher concentrations of midplane dust. Continued photo-evaporation increases the gas:dust ratio until the disk mid-plane becomes gravitationally unstable according to the criteria of Youdin & Shu (2002). Gas drag no impedes rapid grain growth. Therefore, instead of preventing planetesimal formation, exposure to intense UV radiation fields may actually stimulate the rapid growth of planetesimals.
Bally John
Throop Henry B.
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