Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Search for Substellar Companions to the Two Nearest Brown Dwarf
  Systems   WISE J104915.57-531906.1 A+B and WISE J085510.83-071442.5 were recently
discovered as the third and fourth closest known systems to the Sun,
respectively (2.0 and 2.3 pc). The former consists of a L8+T0.5 binary and the
latter is a probable Y dwarf and is the coldest known brown dwarf (~250 K). We
present a search for common proper motion companions to these brown dwarfs
using multi-epoch mid-infrared images from the Spitzer Space Telescope. We have
also obtained near-infrared adaptive optics images of WISE J104915.57-531906.1
A+B with the Very Large Telescope to search for companions at smaller
separations than reached by Spitzer. No new companions are detected in either
system. At projected separations of 25-420" (50-840 AU) for WISE
J104915.57-531906.1 A+B and 4-420" (9-970 AU) for WISE J085510.83-071442.5, the
Spitzer images are sensitive to companions with M_4.5<21.6 and 21.9,
respectively, which correspond to masses of >=1 M_Jup for ages of >=1 Gyr and
temperatures of >=150 K. The detection limit in the adaptive optics images of
WISE J104915.57-531906.1 A+B is dH~10 at 3-15" (6-30 AU), or >=7 M_Jup for >=1
Gyr.

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The categories of this paper are: dg-ga
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The categories of this paper are: atom-ph
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The categories of this paper are: math-ph
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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: comp-gas
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The categories of this paper are: hep-ex
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The categories of this paper are: q-alg
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The categories of this paper are: stat
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The categories of this paper are: q-fin
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The categories of this paper are: math
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The categories of this paper are: bayes-an
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The categories of this paper are: hep-lat
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The categories of this paper are: supr-con
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The categories of this paper are: plasm-ph
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The categories of this paper are: hep-ph