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Discovery of an M9.5 Candidate Brown Dwarf in the TW Hydrae Association: DENIS J124514.1-442907
We report the discovery of a fifth candidate substellar system in the~5-10 Myr TW Hydrae association: DENIS J124514.1-442907. This object hasa NIR spectrum remarkably similar to that of 2MASS J1139511-315921, aknown TW Hydrae brown dwarf, with low surface gravity features such as atriangular-shaped H band, deep H2O absorption, weak alkalilines, and weak hydride bands. We find an optical spectral type of M9.5and estimate a mass of <~24 MJup, assuming an age of ~5-10Myr. While the measured proper motion for DENIS J124514.1-442907 isinconclusive as a test for membership, its position in the sky iscoincident with the TW Hydrae association. A more accurate proper-motionmeasurement, higher resolution spectroscopy for radial velocity, and aparallax measurement are needed to derive the true space motion and toconfirm its membership.Some of the data presented herein were obtained at the W. M. KeckObservatory, which is operated as a scientific partnership among theCalifornia Institute of Technology, the University of California, andthe National Aeronautics and Space Administration. The Observatory wasmade possible by the generous financial support of the W. M. KeckFoundation. This Letter includes data gathered with the 6.5 m MagellanTelescopes located at Las Campanas Observatory, Chile.
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