Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010dps....42.0201t&link_type=abstract
American Astronomical Society, DPS meeting #42, #2.01; Bulletin of the American Astronomical Society, Vol. 42, p.943
Astronomy and Astrophysics
Astronomy
Scientific paper
Photo-evaporation sculpts protoplanetary disks during their earliest 1-5 Myr. Traditional models of photo-evaporation have assumed that the distnace between the disk an an external UV-bright star is fixed, typically at 0.1 pc. However, the star clusters in which these disks form are dynamic, with orbital crossing times of 0.1-0.5 Myr. The UV flux from a central star is therefore highly variable.
We will present our simulations of photo-evaporation in a dynamic star cluster. We show that the UV flux received by disks varies by a factor of 10 - 1000 x during a disk's first several Myr. Most of the flux is deposited during brief, intense close-approaches to the central star. Photo-evaporation during this time readily affects a disk's final mass and architecture. Furthermore, the diversity of orbits through the cluster implies a broad diversity of final mass configurations for disks, even for disks with identical ages and initial conditions.
Bally John
Throop Henry B.
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