András Gáspár, Dimitrios Psaltis, George H. Rieke, Feryal Özel
We explore the evolution of the mass distribution of dust in
collision-dominated debris disks, using the collisional code introduced in our
previous paper. We analyze the equilibrium distribution and its dependence on
model parameters by evolving over 100 models to 10 Gyr. With our numerical
models, we show that systems reach collisional equilibrium with a mass
distribution that is steeper than the ones given by earlier analytic or current
numerical methods. Our model yields a steady state slope of n(m) ~ m^{-1.88}
[n(a) ~ a^{-3.65}]. This steeper solution has observable effects in the
submillimeter and millimeter wavelength regimes of the electromagnetic
spectrum. We assemble data for nine debris disks that have been observed at
these wavelengths and, using a simplified absorption efficiency model, show
that the predicted slope of the particle mass distribution generates SEDs that
are in agreement with the observed ones.
View original:
http://arxiv.org/abs/1111.0296
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