Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Radiation hydrodynamical models of the inner rim in protoplanetary disks   Many stars host planets orbiting within a few astronomical units (AU). The
occurrence rate and distributions of masses and orbits vary greatly with the
host stars mass. These close planets origins are a mystery that motivates
investigating protoplanetary disks central regions. A key factor governing the
conditions near the star is the silicate sublimation front, which largely
determines where the starlight is absorbed, and which is often called the inner
rim. We present the first radiation hydrodynamical modeling of the sublimation
front in the disks around the young intermediate-mass stars called Herbig Ae
stars. The models are axisymmetric, and include starlight heating, silicate
grains sublimating and condensing to equilibrium at the local, time-dependent
temperature and density, and accretion stresses parametrizing the results of
MHD magneto-rotational turbulence models. The results compare well with
radiation hydrostatic solutions, and prove to be dynamically stable. Passing
the model disks into Monte Carlo radiative transfer calculations, we show that
the models satisfy observational constraints on the inner rims location. A
small optically-thin halo of hot dust naturally arises between the inner rim
and the star. The inner rim has a substantial radial extent, corresponding to
several disk scale heights. While the fronts overall position varies with the
stellar luminosity, its radial extent depends on the mass accretion rate. A
pressure maximum develops near the location of thermal ionization at
temperatures about 1000 K. The pressure maximum is capable of halting solid
pebbles radial drift and concentrating them in a zone where temperatures are
sufficiently high for annealing to form crystalline silicates.

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The categories of this paper are: plasm-ph
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The categories of this paper are: atom-ph
17
The categories of this paper are: q-fin
15
The categories of this paper are: nucl-ex
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The categories of this paper are: math-ph
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The categories of this paper are: mtrl-th
12
The categories of this paper are: nucl-th
1
The categories of this paper are: cs
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The categories of this paper are: chao-dyn
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The categories of this paper are: quant-ph
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The categories of this paper are: acc-phys
10
The categories of this paper are: q-bio
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The categories of this paper are: dg-ga
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The categories of this paper are: stat
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The categories of this paper are: cmp-lg
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The categories of this paper are: funct-an