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

(2) AMNH; (3) IPAC; (4) UCLA); Adam J. Burgasser (2); C. G. Tinney (1); J. Davy Kirkpatrick (3); Michael W. McElwain (4) ((1) AAO; S. C. Ellis (1)

arxiv: astro-ph/0508149 · v1 · submitted 2005-08-05 · 🌌 astro-ph

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

S. C. Ellis (1) , C. G. Tinney (1) , Adam J. Burgasser (2) , J. Davy Kirkpatrick (3) , Michael W. McElwain (4) ((1) AAO , (2) AMNH , (3) IPAC , (4) UCLA) This is my paper

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keywords dwarfmethanebanddiscoveryestimatedfiltersimagingm2151-4853

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

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