WISEP J061135.13–041024.0 AB: A J-band Flux Reversal Binary at the L/T Transition
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2014-05-28Metadata
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Gelino, Cristopher E.
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WISEP J061135.13–041024.0 AB: A J-band Flux Reversal Binary at the L/T Transition
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Abstract
We present Keck II laser guide star adaptive optics observations of the brown dwarf WISEP J061135.13−041024.0
showing it is a binary with a component separation of 0.
4. This system is one of the six known resolved binaries
in which the magnitude differences between the components show a reversal in sign between the Y/J band and
the H/K bands. Deconvolution of the composite spectrum results in a best-fit binary solution with L9 and T1.5
components. We also present a preliminary parallax placing the system at a distance of 21.2 ± 1.3 pc. Using the
distance and resolved magnitudes we are able to place WISEP J061135.13−041024.0 AB on a color–absolute
magnitude diagram, showing that this system contributes to the well-known “J-band bump” and the components’
properties appear similar to other late-type L and early-type T dwarfs. Fitting our data to a set of cloudy atmosphere
models suggests the system has an age >1 Gyr with WISE 0611−0410 A having an effective temperature (Teff)
of 1275–1325 K and mass of 64–65 MJup, and WISE 0611−0410 B having Teff = 1075–1115 K and mass
40–65 MJup.
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Artículo de publicación ISI.
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The Astronomical Journal, 148:6 (10pp), 2014 July
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