Hideko Nomura
Dept. Physics, Univ. Manchester Inst. Science Technology (UMIST) (Manchester, Royaume-Uni)
viscously heated protoplanetary disks, taking into account of the
effect of dust particle growth and settling. Our results show
that as the dust particles grow, a convectively unstable region
diminishes. This is because the reprocessed radiative heating from
the inner disk dominates the viscous heating even near the midplane
of the outer disk, due to the 2D effect of radiative transfer. On
the other hand, the magnetorotationally unstable region spreads
due to the decrease in recombination rate of electron on dust
grains, which increases the ionization degree of matter. Meanwhile,
as the dust particles settle, both the convective and the
magnetorotational instabilities are stabilized. The latter is
because of the increase of the dust number density, that is, the
rise in the recombination rate near the midplane of the disk.
, Institut d'Astrophysique de Paris