Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Polluting White Dwarfs with Perturbed Exo-Comets   We present a model to account for the observed debris disks around young
white dwarfs and the presence of metal-lines in their spectra. Stellar
evolution models predict that the mass-loss on the AGB will be pulsed;
furthermore, observations indicate that the bulk of the mass-loss occurs on the
AGB. In this case, if the progenitors of the white dwarfs had remnants of
planetary formation like the Sun's Oort cloud or the Kuiper Belt and a planet
lying within that cloud or nearby, we find that up to 2% of the planetesimals
will fall either into planet-crossing orbits or into chaotic regions after the
mass-loss, depending on the location and mass of the planet (from Mars to
Neptune). This yields a sufficient mass of comets that can be scattered toward
the star, form a debris disk and pollute the atmosphere.

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The categories of this paper are: plasm-ph
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The categories of this paper are: dg-ga
21
The categories of this paper are: adap-org
5
The categories of this paper are: gr-qc
31
The categories of this paper are: ao-sci
16
The categories of this paper are: stat
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The categories of this paper are: alg-geom
1
The categories of this paper are: cs
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The categories of this paper are: cmp-lg
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The categories of this paper are: acc-phys
15
The categories of this paper are: nucl-ex
14
The categories of this paper are: math-ph
10
The categories of this paper are: q-bio
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The categories of this paper are: mtrl-th
22
The categories of this paper are: chao-dyn
12
The categories of this paper are: nucl-th