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In 2005, Scholz and collaborators (Scholz et al. 2005) discovered, in aproper motion survey, a young brown dwarf SSSPMJ1102-3431(SSSPMJ1102) ofspectral type M8.5, probable member of the TW Hydrae Association (TWA) andpossible companion of the T Tauri star TW Hya. The physical characterization ofSSSPMJ1102 was based on the hypothesis that it forms a binary system with TWHya. The recent discovery of a probable giant planet inside the TW Hyaprotoplanetary disk with a very short-period (Setiawan et al. 2008) and a diskaround SSSPMJ1102 (Riaz and Gizis 2008) make it especially interesting andimportant to measure well the physical parameters of SSSPMJ1102. Trigonometricparallax and proper motion measurements of SSSPMJ1102 are necessary to test forTWA membership and, thus, to determine the mass and age of this young browndwarf and the possibility that it forms a wide binary system with TW Hya. Twoyears of regular observations at the ESO NTT/SUSI2 telescope, have enabled usto determine the trigonometric parallax and proper motion of SSSPMJ1102. Ourparallax and proper motion determination allow us to precisely describe thephysical properties of this low mass object and to confirm its TWA membership.Our results are not incompatible with the hypothesis that SSSPMJ1102 is abinary companion of the star TW Hya.

SSPMJ1102-3431 brown dwarf characterization from accurate proper motion and trigonometric parallax