Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: First Scattered-Light Image of the Debris Disk around HD 131835 with the
  Gemini Planet Imager   We present the first scattered-light image of the debris disk around HD
131835 in $H$ band using the Gemini Planet Imager. HD 131835 is a $\sim$15 Myr
old A2IV star at a distance of $\sim$120 pc in the Sco-Cen OB association. We
detect the disk only in polarized light and place an upper limit on the peak
total intensity. No point sources resembling exoplanets were identified.
Compared to its mid-infrared thermal emission, the disk in scattered light
shows similar orientation but different morphology. The scattered-light disk
extends from $\sim$75 to $\sim$210 AU in the disk plane with roughly flat
surface density. Our Monte Carlo radiative transfer model can well describe the
observations with a model disk composed of a mixture of silicates and amorphous
carbon. In addition to the obvious brightness asymmetry due to stronger forward
scattering, we discover a weak brightness asymmetry along the major axis with
the northeast side being 1.3 times brighter than the southwest side at a
3-{\sigma} level.

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The categories of this paper are: gr-qc
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The categories of this paper are: cs
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The categories of this paper are: nlin
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The categories of this paper are: eess
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The categories of this paper are: quant-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: chem-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: adap-org
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The categories of this paper are: nucl-th
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The categories of this paper are: math-ph
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The categories of this paper are: q-fin
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The categories of this paper are: alg-geom
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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: hep-ex