Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Possible Icy Kuiper Belt around HD 181327   We have obtained a Gemini South T-ReCS Qa-band (18.3 micron) image and a
Spitzer MIPS SED-mode observation of HD181327, an F5/F6V member of the ~12 Myr
old beta Pictoris moving group. We resolve the disk in thermal-emission for the
first time and find that the northern arm of the disk is 1.4x brighter than the
southern arm. In addition, we detect a broad peak in the combined Spitzer IRS
and MIPS spectra at 60 - 75 micron that may be produced by emission from
crystalline water ice. We model the IRS and MIPS data using a size distribution
of amorphous olivine and water ice grains (dn/da proportional to a^{-2.25} with
a_{min} consistent with the minimum blow out size and a_{max} = 20 micron)
located at a distance of 86.3 AU from the central star, as observed in
previously published scattered-light images. Since the photo-desorption
lifetime for the icy particles is ~1400 yr, significantly less than the
estimated ~12 Myr age of the system, we hypothesize that we have detected
debris that may be steadily replenished by collisions among icy Kuiper belt
object-like parent bodies in a newly forming planetary system.

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The categories of this paper are: hep-ex
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The categories of this paper are: nlin
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The categories of this paper are: solv-int
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The categories of this paper are: q-bio
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The categories of this paper are: nucl-ex
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The categories of this paper are: adap-org
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The categories of this paper are: physics
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The categories of this paper are: dg-ga
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The categories of this paper are: quant-ph
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The categories of this paper are: cond-mat
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The categories of this paper are: hep-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: chao-dyn
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The categories of this paper are: hep-lat
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The categories of this paper are: eess
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The categories of this paper are: cmp-lg