Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Two phase, inward-then-outward migration of Jupiter and Saturn in the
  gaseous Solar Nebula   It has recently been shown that the terrestrial planets and asteroid belt can
be reproduced if the giant planets underwent an inward-then-outward migration
(the "Grand Tack"; Walsh et al 2011). Inward migration occurs when Jupiter
opens a gap and type II migrates inward. The planets "tack" and migrate outward
when Saturn reaches the gap-opening mass and is caught in the 3:2 resonance
with Jupiter. The aim is to test the viability of the Grand Tack model and to
study the dynamical evolution of Jupiter and Saturn during their growth from 10
Earth masses cores. We have performed numerical simulations using a grid-based
hydrodynamical code. Most of our simulations assume an isothermal equation of
state for the disk but a subset use a fully-radiative version of the code. For
an isothermal disk the two phase migration of Jupiter and Saturn is very robust
and independent of the mass-growth history of these planets provided the disk
is cool enough. For a radiative disk the we find some outcomes with two phase
migrations and others with more complicated behavior. We construct a simple,
1-D model of an evolving viscous disk to calculate the evolution of the disk's
radiative properties: the disk transitions from radiative to isothermal from
its outermost regions inward in time. We show that a two-phase migration is a
natural outcome at late times even under the limiting assumption that
isothermal conditions are required. Thus, our simulations provide strong
support for the Grand Tack scenario.

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The categories of this paper are: mtrl-th
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The categories of this paper are: cmp-lg
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The categories of this paper are: physics
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The categories of this paper are: chem-ph
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The categories of this paper are: q-alg
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The categories of this paper are: cond-mat
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The categories of this paper are: nlin
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The categories of this paper are: chao-dyn
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The categories of this paper are: adap-org
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The categories of this paper are: eess
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The categories of this paper are: math-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: hep-ex
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The categories of this paper are: alg-geom
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The categories of this paper are: funct-an
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The categories of this paper are: cs