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We report the discovery of a fifth candidate substellar system in the ~5-10Myr TW Hydrae Association - DENIS J124514.1-442907. This object has a NIRspectrum remarkably similar to that of 2MASS J1139511-315921, a known TW Hydraebrown dwarf, with low surface gravity features such as a triangular-shapedH-band, deep H2O absorption, weak alkali lines, and weak hydride bands. We findan optical spectral type of M9.5 and estimate a mass of <24 M_Jup, assuming anage of ~5-10 Myr. While the measured proper motion for DENIS J124514.1-442907is inconclusive as a test for membership, its position in the sky is coincidentwith the TW Hydrae Association. A more accurate proper motion measurement,higher resolution spectroscopy for radial velocity, and a parallax measurementare needed to derive the true space motion and to confirm its membership.

Discovery of an M9.5 Candidate Brown Dwarf in the TW Hydrae Association - DENIS J124514.1-442907