Southern Hemisphere Search and Investigation of T dwarfs Selected by 2MASS

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Scientific paper

Using 2MASS data, we are systematically searching for the coolest sub-stellar objects known - ``T'' dwarfs, or methane brown dwarfs. To date, follow-up investigations of 2MASS candidates at CTIO have identified seven of the fourteen T dwarfs discovered thus far by our search. Our program is focused on producing a spatially complete, statistically significant, spectroscopic sample in order to investigate the observable properties of these cool brown dwarfs. We are working toward the definition of a near-infrared T spectral sequence, which necessitates measurements of molecular band strengths, atomic lines, and other temperature- and gravity-dependent spectral signatures, for which OSIRIS in cross-dispersed mode is ideally suited. We thus propose to continue our southern hemisphere investigation of T dwarfs at CTIO. We will use the 1.5m CIRIM to eliminate contaminant asteroids and artifacts from our target list, and the 4m OSIRIS in cross-dispersed mode to acquire broad-band, moderate resolution spectral data for the remaining candidates.

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