Disk Winds as an Explanation for Slowly Evolving Temperatures in Tidal
  Disruption Events
  Among the many intriguing aspects of optically discovered tidal disruption
events (TDEs) is that their temperatures are lower than expected and that the
temperature does not evolve as rapidly with decreasing fallback rate as would
be expected in standard disk theory. We show that this can be explained
qualitatively using an idea proposed by Laor & Davis in the context of normal
active galactic nuclei: that larger accretion rates imply stronger winds and
thus that the accretion rate through the inner disk only depends weakly on the
inflow rate at the outer edge of the disk. We also show that reasonable
quantitative agreement with data requires that, as has been suggested in recent
papers, the circularization radius of the tidal stream is approximately equal
to the semimajor axis of the most bound orbit of the debris rather than twice
the pericenter distance as would be expected without rapid angular momentum
redistribution. If this explanation is correct, it suggests that the evolution
of TDEs may test both non-standard disk theory and the details of the
interactions of the tidal stream.
