Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: An Improved Near-Infrared Spectrum of the Archetype Y Dwarf WISEP
  J182831.08+265037.8   We present a Hubble Space Telescope/Wide-Field Camera 3 near infrared
spectrum of the archetype Y dwarf WISEP 182831.08+265037.8. The spectrum covers
the 0.9-1.7 um wavelength range at a resolving power of lambda/Delta lambda
~180 and is a significant improvement over the previously published spectrum
because it covers a broader wavelength range and is uncontaminated by light
from a background star. The spectrum is unique for a cool brown dwarf in that
the flux peaks in the Y, J, and H band are of near equal intensity in units of
f_lambda. We fail to detect any absorption bands of NH_3 in the spectrum, in
contrast to the predictions of chemical equilibrium models, but tentatively
identify CH_4 as the carrier of an unknown absorption feature centered at 1.015
um. Using previously published ground- and spaced-based photometry, and using a
Rayleigh Jeans tail to account for flux emerging longward of 4.5 um, we compute
a bolometric luminosity of log (L_bol/L_sun)=-6.50+-0.02 which is significantly
lower than previously published results. Finally, we compare the spectrum and
photometry to two sets of atmospheric models and find that best overall match
to the observed properties of WISEP 182831.08+265037.8 is a ~1 Gyr old binary
composed of two T_eff~325 K, ~5 M_Jup brown dwarfs with subsolar [C/O] ratios.

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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: acc-phys
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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: dg-ga
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The categories of this paper are: q-fin
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The categories of this paper are: cs
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The categories of this paper are: adap-org
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The categories of this paper are: funct-an
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The categories of this paper are: chao-dyn
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The categories of this paper are: atom-ph
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The categories of this paper are: quant-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: bayes-an
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The categories of this paper are: hep-th