The 2MASS Wide-Field T Dwarf Search. V. Discovery of a T Dwarf via Methane Imaging

Details The 2MASS Wide-Field T Dwarf Search. V. Discovery of a T Dwarf via Methane Imaging The 2MASS Wide-Field T Dwarf Search. V. Discovery of a T Dwarf via Methane Imaging

2005-08-05

arxiv.org/abs/astro-ph/0508149v1

Astron.J.130:2347-2351,2005

Astronomy and Astrophysics

Astrophysics

Accepted for publication in AJ. 8 pages, 4 figures

Scientific paper

10.1086/491790

We present the discovery of a T dwarf, 2M2151-4853, via differential imaging through methane filters. The filters are designed to highlight the strong absorption in the H band, due to methane found in the atmospheres of T dwarfs, and provide a very efficient means of searching for them. Subsequent J and H band spectroscopy confirms 2M2151-4853 as a T dwarf of type T4.5. It has an estimated spectrophotometric distance of 18 +/- 3 pc, and an estimated tangential velocity of v=50 +/- 10 km/s.

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