Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Resolved Near-Infrared Spectroscopy of WISE J104915.57-531906.1AB: A
  Flux-Reversal Binary at the L dwarf/T dwarf Transition   We report resolved near-infrared spectroscopy and photometry of the recently
identified brown dwarf binary WISE J104915.57-531906.1AB, located 2.02+/-0.15
pc from the Sun. Low-resolution spectral data from Magellan/FIRE and IRTF/SpeX
reveal strong H2O and CO absorption features in the spectra of both components,
with the secondary also exhibiting weak CH4 absorption at 1.6 micron and 2.2
micron. Spectral indices and comparison to low-resolution spectral standards
indicate component types of L7.5 and T0.5, the former consistent with the
optical classification of the primary. Relative photometry reveals a flux
reversal between the J- and K-bands, with the T dwarf component being brighter
in the 0.95--1.3 micron range. As with other L/T transition binaries, this
reversal likely reflects significant depletion of condensate opacity across the
transition, a behavior that may be enhanced in WISE J1049-5319AB if the unusual
red color of its L dwarf component is indicative of thick clouds. On the other
hand, differing cloud properties may have modified the evolutionary paths of
these two components, and we propose a scenario in which the cooler secondary
could be the more massive of the two components. Fortunately, the proximity,
brightness and small separation (3.12+/-0.25 AU) of this system make it
amenable to astrometric and radial velocity orbit measurement during its
estimated 25 yr orbit, providing a rare opportunity for the direct
determination of individual brown dwarf masses and a unique benchmark for
studying cloud evolution across the L dwarf/T dwarf transition.

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The categories of this paper are: cmp-lg
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The categories of this paper are: cs
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The categories of this paper are: alg-geom
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The categories of this paper are: atom-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: adap-org
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The categories of this paper are: nucl-ex
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The categories of this paper are: q-fin
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The categories of this paper are: chem-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: q-bio
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The categories of this paper are: econ
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The categories of this paper are: acc-phys
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The categories of this paper are: mtrl-th
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The categories of this paper are: nlin
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The categories of this paper are: supr-con