Can Photo-Evaporation Trigger Planetesimal Formation?. Henry Throop John Bally SWRI Univ.Colorado / CASA DPS 12-Oct-2004. Orion Nebula. Photo-evaporation (PE) by external O/B stars removes disks on 10 5 -10 6 yr timescales.
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Henry Throop John Bally
SWRI Univ.Colorado / CASA
Photo-evaporation (PE) by external O/B stars removes disks on 105-106 yr timescales.
OB associations like Orion are rare but large – majority of star formation in the galaxy probably occurs in regions like this.
Photo-evaporation by extrnal O and B stars
4 O/B stars, UV-bright, 105 solar luminosities
2000 solar-type stars with disks
Hashed: critical density for GI
0 yr: Low-mass star with disk forms
105 yr: Grains grow and settle
105 yr: O stars turn on
106 yr: Gas disk is lost, allowing planetesimals to form from disk