Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Excess Infrared Radiation from a Massive DAZ White Dwarf: GD362 - a
  Debris Disk?   We report the discovery of excess K-band radiation from a massive DAZ white
dwarf star, GD362. Combining infrared photometric and spectroscopic
observations, we show that the excess radiation cannot be explained by a
stellar or substellar companion, and is likely to be caused by a debris disk.
This would be only the second such system known, discovered 18 years after
G29-38, the only single white dwarf currently known to be orbited by
circumstellar dust. Both of these systems favor a model with accretion from a
surrounding debris disk to explain the metal abundances observed in DAZ white
dwarfs. Nevertheless, observations of more DAZs in the mid-infrared are
required to test if this model can explain all DAZs.

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The categories of this paper are: atom-ph
16
The categories of this paper are: stat
17
The categories of this paper are: q-fin
2
The categories of this paper are: math
12
The categories of this paper are: nucl-th
1
The categories of this paper are: cs
22
The categories of this paper are: chao-dyn
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The categories of this paper are: bayes-an
5
The categories of this paper are: gr-qc
14
The categories of this paper are: math-ph
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The categories of this paper are: q-alg
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The categories of this paper are: hep-ex
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The categories of this paper are: comp-gas
4
The categories of this paper are: cond-mat
0
The categories of this paper are: hep-ph
23
The categories of this paper are: solv-int