Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Infrared Emission from the Dusty Disk Orbiting GD 362, An
  Externally-Polluted White Dwarf   We report Spitzer Space Telescope photometry between 3.6 microns and 24
microns and spectroscopy between 5 microns and 15 microns of GD 362, a white
dwarf with an effective temperature near 10,000 K that displays a remarkably
high concentration of metals in its photosphere and a thermal infrared excess.
We approximately reproduce both the infrared continuum and the very strong 10
micron silicate emission feature with a model of an orbiting dusty disk which
is flat out to 50 stellar radii and warped between 50 and 70 stellar radii. The
relatively small amount of cold material implied by the weak 24 mircon flux
argues that the disk lies within the Roche radius of the star, and we may be
witnessing a system where an asteroidal-size body has been tidally destroyed.
If so, determination of the photospheric metal abundances may measure the bulk
composition of an extrasolar minor planet.

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The categories of this paper are: econ
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The categories of this paper are: cs
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The categories of this paper are: plasm-ph
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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: adap-org
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The categories of this paper are: funct-an
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The categories of this paper are: ao-sci
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The categories of this paper are: cmp-lg
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The categories of this paper are: q-fin
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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: math-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: bayes-an
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The categories of this paper are: quant-ph