Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Frequency of Debris Disks at White Dwarfs   We present near- and mid-infrared photometry and spectroscopy from PAIRITEL,
IRTF, and Spitzer of a metallicity-unbiased sample of 117 cool,
hydrogen-atmosphere white dwarfs from the Palomar-Green survey and find five
with excess radiation in the infrared, translating to a 4.3+2.7-1.2% frequency
of debris disks. This is slightly higher than, but consistent with the results
of previous surveys. Using an initial-final mass relation, we apply this result
to the progenitor stars of our sample and conclude that 1-7Msol stars have at
least a 4.3% chance of hosting planets; an indirect probe of the
intermediate-mass regime eluding conventional exoplanetary detection methods.
Alternatively, we interpret this result as a limit on accretion timescales as a
fraction of white dwarf cooling ages; white dwarfs accrete debris from several
generations of disks for ~10Myr. The average total mass accreted by these stars
ranges from that of 200km asteroids to Ceres-sized objects, indicating that
white dwarfs accrete moons and dwarf planets as well as Solar System asteroid
analogues.

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The categories of this paper are: solv-int
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The categories of this paper are: math-ph
0
The categories of this paper are: hep-ph
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The categories of this paper are: econ
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The categories of this paper are: ao-sci
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The categories of this paper are: acc-phys
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The categories of this paper are: chao-dyn
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The categories of this paper are: q-fin
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The categories of this paper are: nlin
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The categories of this paper are: cmp-lg
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The categories of this paper are: hep-ex
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The categories of this paper are: adap-org
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The categories of this paper are: q-bio
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The categories of this paper are: supr-con
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The categories of this paper are: cs
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The categories of this paper are: bayes-an