NPARSEC: NTT Parallaxes of Southern Extremely Cool objects. Goals, targets, procedures and first results

R. L. Smart , C. G. Tinney , B. Bucciarelli , F. Marocco , U. Abbas , A. Andrei , G. Bernardi , B. Burningham

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C. Cardoso E. Costa M. T. Crosta M. Dapra A. Day-Jones B. Goldman H. R. A. Jones M. G. Lattanzi S. K. Leggett P. Lucas R. Mendez J. L. Penna D. Pinfield L. Smith A. Sozzetti A. Vecchiato

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classification 🌌 astro-ph.SR astro-ph.IM

keywords objectscooldeterminedistancesresultsacrossatmospheresbinarity

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The discovery and subsequent detailed study of T dwarfs has provided many surprises and pushed the physics and modeling of cool atmospheres in unpredicted directions. Distance is a critical parameter for studies of these objects to determine intrinsic luminosities, test binarity and measure their motion in the Galaxy. We describe a new observational program to determine distances across the full range of T dwarf sub-types using the NTT/SOFI telescope/instrument combination. We present preliminary results for ten objects, five of which represent new distances.

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NPARSEC: NTT Parallaxes of Southern Extremely Cool objects. Goals, targets, procedures and first results

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