Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Saturn's formation and early evolution at the origin of Jupiter's
  massive moons   The four massive Galilean satellites are believed to have formed within a
circumplanetary disk during the last stages of Jupiter's formation. While the
existence of a circum-jovian disk is supported by hydrodynamic simulations, no
consensus exists regarding the origin and delivery mechanisms of the building
blocks of the forming satellites. The opening of a gap in the circumsolar disk
would have efficiently isolated Jupiter from the main sources of solid
material. However, a reservoir of planetesimals should have existed at the
outer edge of Jupiter's gap, where solids were trapped and accumulated over
time. Here we show that the formation of Saturn's core within this reservoir,
or its prompt inward migration, allows planetesimals to be redistributed from
this reservoir towards Jupiter and the inner Solar System, thereby providing
enough material to form the Galilean satellites and to populate the Main Belt
with primitive asteroids. We find that the orbit of planetesimals captured
within the circumjovian disk are circularized through friction with gas in a
compact system comparable to the current radial extent of the Galilean
satellites. The decisive role of Saturn in the delivery mechanism has strong
implications for the occurrence of massive moons around extrasolar giant
planets as they would preferentially form around planets within multiple planet
systems.

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The categories of this paper are: bayes-an
22
The categories of this paper are: chao-dyn
0
The categories of this paper are: hep-ph
34
The categories of this paper are: chem-ph
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The categories of this paper are: cmp-lg
16
The categories of this paper are: stat
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The categories of this paper are: eess
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The categories of this paper are: q-fin
10
The categories of this paper are: q-bio
33
The categories of this paper are: plasm-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: math-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: hep-lat
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The categories of this paper are: adap-org
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The categories of this paper are: funct-an