Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Near-Infrared Wide-Field Proper Motion Search for Brown Dwarfs   A common proper motion survey of M dwarf stars within 8 pc of the Sun reveals
no new stellar or brown dwarf companions at wide separations (~100-1400 AU).
This survey tests whether the brown dwarf ``desert'' extends to large
separations around M dwarf stars and further explores the census of the solar
neighborhood. The sample includes 66 stars north of -30 degrees and within 8 pc
of the Sun. Existing first epoch images are compared to new J-band images of
the same fields an average of 7 years later to reveal proper motion companions
within a ~4 arcminute radius of the primary star. No new companions are
detected to a J-band limiting magnitude of ~16.5, corresponding to a companion
mass of ~40 Jupiter masses for an assumed age of 5 Gyr at the mean distance of
the objects in the survey, 5.8 pc.

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The categories of this paper are: dg-ga
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The categories of this paper are: funct-an
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The categories of this paper are: econ
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The categories of this paper are: stat
5
The categories of this paper are: gr-qc
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The categories of this paper are: nucl-ex
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The categories of this paper are: cmp-lg
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The categories of this paper are: hep-lat
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The categories of this paper are: math
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The categories of this paper are: atom-ph
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The categories of this paper are: q-bio
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The categories of this paper are: solv-int
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The categories of this paper are: hep-th
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The categories of this paper are: hep-ph
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The categories of this paper are: math-ph
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The categories of this paper are: cond-mat