Disk Accretion Phase: Accretion Rates
Estimated from ultraviolet excess emission
- Measures inner disk accretion rate
dM/dt increases with increasing mass
- dM/dt ~ 10-7.5 for 0.5 MO; may increase ~ linearly with M
Instantaneous rates are lower than time-averaged rates
- Accretion rates ~103 higher during FU Ori phase
- Recall that total mass passing through the disk is large
Wide dispersion (> 10x) in dM/dt at fixed age and mass
- Q: might this dispersion reflect the effects of planets?
Binarity and tidal encounters may affect dM/dt