The 2MASS Wide-Field T Dwarf Search. V. Discovery of a T Dwarf via Methane Imaging
arXiv:astro-ph/0508149 · doi:10.1086/491790
Abstract
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.
arXiv commentAccepted for publication in AJ. 8 pages, 4 figures
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