Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: 49 new T dwarfs identified using methane imaging   We present the discovery of 49 new photometrically classified T dwarfs from
the combination of large infrared and optical surveys combined with follow-up
TNG photometry. We used multi-band infrared and optical photometry from the
UKIRT and Sloan Digital Sky Surveys to identify possible brown dwarf
candidates, which were then confirmed using methane filter photometry. We have
defined a new photometric conversion between CH4s - CH4l colour and spectral
type for T4 to T8 brown dwarfs based on a part of the sample that has been
followed up using methane photometry and spectroscopy. Using methane
differential photometry as a proxy for spectral type for T dwarfs has proved to
be a very efficient technique. Of a subset of 45 methane selected brown dwarfs
that were observed spectroscopically, 100% were confirmed as T dwarfs. Future
deep imaging surveys will produce large samples of faint brown dwarf
candidates, for which spectroscopy will not be feasible. When broad wavelength
coverage is unavailable, methane imaging offers a means to efficiently classify
candidates from such surveys using just a pair of near-infrared images.

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The categories of this paper are: ao-sci
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The categories of this paper are: q-bio
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The categories of this paper are: math-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: cmp-lg
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The categories of this paper are: stat
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The categories of this paper are: hep-lat
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The categories of this paper are: atom-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: hep-ph
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The categories of this paper are: nlin
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The categories of this paper are: quant-ph
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The categories of this paper are: q-alg
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The categories of this paper are: patt-sol
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The categories of this paper are: chem-ph
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The categories of this paper are: physics