Discovery of a TW Hydrae Candidate Brown Dwarf

Details Discovery of a TW Hydrae Candidate Brown Dwarf Discovery of a TW Hydrae Candidate Brown Dwarf

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.1706l&link_type=abstract

American Astronomical Society Meeting 210, #17.06; Bulletin of the American Astronomical Society, Vol. 39, p.118

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Scientific paper

We present the discovery of a candidate brown dwarf member to the TW Hydrae Association, an 8 Myr old co-moving group. This object is only the fourth candidate brown dwarf in the association, joining TWA 5B, 2MASS 1207-3932AB, and 2MASS 1139-3159. Its near-infrared spectrum is remarkably similar to that of 2MASS 1139-3159, with low-gravity features showing an overall red color compared to field late-type M dwarfs, a triangular-shaped H-band, and a very weak FeH-band at 0.99 microns. Its proper motion and position in the sky are coincident with other members. However, moderate resolution spectroscopy and a parallax measurement are needed to derive the true space motion and to confirm its membership in TW Hydrae. This object is an excellent target for high resolution imaging to search for cooler companions like the 8 M_Jup companion to 2MASS 1207-3932A and for mid-infrared imaging to determine if it has a disk.

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