2MASS J05185995-2828372: Discovery of an Unresolved L/T Binary

Details 2MASS J05185995-2828372: Discovery of an Unresolved L/T Binary 2MASS J05185995-2828372: Discovery of an Unresolved L/T Binary

2004-02-07

arxiv.org/abs/astro-ph/0402172v1

Astrophys.J. 604 (2004) L61-L64

Astronomy and Astrophysics

Astrophysics

4 pages, 4 figures (2 color), accepted to ApJ Letters

Scientific paper

10.1086/383415

We present the peculiar near-infrared spectrum of the newly discovered brown dwarf 2MASS J05185995-2828372, identified in the Two Micron All-Sky Survey. Features characteristic of both L and T dwarfs are present, namely strong carbon monoxide absorption in K-band, strong methane absorption in J- and H-bands, and red near-infrared colors. We consider several scenarios that could produce these features and conclude that the object is most likely to be an unresolved L/T binary system. We discuss how the estimated photometric properties of this object are consistent with the observed J-band brightening of brown dwarfs between late-L and early-T dwarfs, making detailed study of this system an important probe of the L/T transition.

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