Discovery of the First Resolved Triple T-Dwarf

Details Discovery of the First Resolved Triple T-Dwarf Discovery of the First Resolved Triple T-Dwarf

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21722601r&link_type=abstract

American Astronomical Society, AAS Meeting #217, #226.01; Bulletin of the American Astronomical Society, Vol. 43, 2011

Physics

Optics

Scientific paper

We present imaging and spectroscopy of a recently discovered triple T-dwarf system. This system, which has an unresolved spectral type of T3, was resolved into a 0.55'' A(BC), and 0.05''(BC) components using the laser guide star adaptive optics at Keck during our program designed to check for unresolved binarity in early T-dwarfs whose near infrared colors span the L/T transition. This phase of brown dwarf evolution, characterized by the rapid disappearance of dust clouds over a very small range of brown dwarf effective temperatures and a corresponding brightening in the J-band remains poorly understood, and is complicated by the fact that most observations of L/T transition objects are drawn from a heterogeneous sample, consisting of a high frequency of unresolved binaries, and spanning a wide range of ages and metallicities. As the first resolved triple T-dwarf, our system represents a unique laboratory for confronting evolutionary and atmospheric models of the L/T transition.

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