Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Dynamic Sublimation Pressure and the Catastrophic Breakup of Comet ISON   Previously proposed mechanisms have difficulty explaining the disruption of
Comet C/2012 S1 (ISON) as it approached the Sun. We describe a novel cometary
disruption mechanism whereby comet nuclei fragment and disperse through dynamic
sublimation pressure, which induces differential stresses within the interior
of the nucleus. When these differential stresses exceed its material strength,
the nucleus breaks into fragments. We model the sublimation process
thermodynamically and propose that it is responsible for the disruption of
Comet ISON. We estimate the bulk unconfined crushing strength of Comet ISON's
nucleus and the resulting fragments to be 0.5 Pa and 1-9 Pa respectively,
assuming typical Jupiter Family Comet (JFC) albedos. However, if Comet ISON has
an albedo similar to Pluto, this strength estimate drops to 0.2 Pa for the
intact nucleus and 0.6-4 Pa for its fragments. Regardless of assumed albedo,
these are similar to previous strength estimates of JFCs. This suggests that,
if Comet ISON is representative of dynamically new comets, then low bulk
strength is a primordial property of some comet nuclei, and not due to thermal
processing during migration into the Jupiter Family.

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The categories of this paper are: math
10
The categories of this paper are: q-bio
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The categories of this paper are: econ
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The categories of this paper are: math-ph
21
The categories of this paper are: adap-org
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The categories of this paper are: chem-ph
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The categories of this paper are: funct-an
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The categories of this paper are: eess
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The categories of this paper are: physics
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The categories of this paper are: cond-mat
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The categories of this paper are: hep-lat
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The categories of this paper are: cmp-lg
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The categories of this paper are: alg-geom
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The categories of this paper are: atom-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: cs