Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: HST, VLT, and NTT imaging search for wide companions to bona-fide and
  candidate brown dwarfs in the Cha I dark cloud   We present results from a deep imaging search for companions around the young
bona-fide and candidate brown dwarfs Cha Ha 1 to 12 in the Cha I dark cloud,
performed with HST WFPC2 (R, I, Ha), VLT FORS1 (VRI), and NTT SofI (JHK). We
find 16 faint companion candidates around five primaries with separations
between 1.5" and 7" and magnitudes in R & I from 19 to 25 mag, i.e. up to 8 mag
fainter than the primaries. While most of these companion candidates are
probably unrelated background objects, there is one promising candidate, namely
1.5" SW off the M6-dwarf Cha Ha 5. This candidate is 3.8 to 4.7 mag fainter
than the primary and its colors are consistent with an early- to mid-L spectral
type. Assuming the same distance (140 pc) and absorption (0.47 mag in I) as
towards the primary, the companion candidate has log (L(bol)/L(odot) = -3.0 +-
0.3. At the age of the primary (1 to 5 Myrs), the faint object would have a
mass of 3 to 15 Jupiter masses according to Burrows et al. (1997) and Chabrier
& Baraffe (2000) models. The probability for this companion candidate to be an
unrelated fore- or background object is smaller than 0.7%, its colors are
marginally consistent with a strongly reddened background K giant. One other
companion candidate has infrared colors consistent with an early T-dwarf. In
addition, we present indications for Cha Ha 2 being a close (0.2") binary with
both components very close to the sub-stellar limit. Our detection limits are
such that we should have detected all companions above 1 Jup with separations
above 2" (320 AU) and all above 5 Jup at 0.35" (50 AU).

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The categories of this paper are: math
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The categories of this paper are: chao-dyn
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The categories of this paper are: stat
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The categories of this paper are: physics
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The categories of this paper are: nucl-th
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The categories of this paper are: q-alg
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The categories of this paper are: cmp-lg
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The categories of this paper are: hep-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: econ
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The categories of this paper are: funct-an
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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: hep-th
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The categories of this paper are: alg-geom
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The categories of this paper are: patt-sol