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

Kelle L. Cruz·Adam J. Burgasser·I. Neill Reid·James Liebert
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Abstract

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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Kelle L. Cruz, Adam J. Burgasser, I. Neill Reid, James Liebert. 2004-02-07. 2MASS J05185995-2828372: Discovery of an Unresolved L/T Binary. https://doi.org/10.1086/383415

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