SIMBAD references

2007ApJ...669L..97L - Astrophys. J., 669, L97-L100 (2007/November-2)

Discovery of an M9.5 candidate brown dwarf in the TW Hydrae association: DENIS J124514.1-442907.


Abstract (from CDS):

We report the discovery of a fifth candidate substellar system in the ∼5-10 Myr TW Hydrae association: DENIS J124514.1-442907. This object has a NIR spectrum remarkably similar to that of 2MASS J1139511-315921, a known TW Hydrae brown dwarf, with low surface gravity features such as a triangular-shaped H band, deep H2 O absorption, weak alkali lines, and weak hydride bands. We find an optical spectral type of M9.5 and estimate a mass of ≲24 MJup, assuming an age of ∼5-10 Myr. While the measured proper motion for DENIS J124514.1-442907 is inconclusive as a test for membership, its position in the sky is coincident with the TW Hydrae association. A more accurate proper-motion measurement, higher resolution spectroscopy for radial velocity, and a parallax measurement are needed to derive the true space motion and to confirm its membership.

Abstract Copyright:

Journal keyword(s): Galaxy: Open Clusters and Associations: Individual: Name: TW Hydrae - stars: individual (DENIS J124514.1-442907) - stars: individual (2MASS J1207334-393254) - stars: individual (2MASS J1139511-315921) - Stars: Low-Mass, Brown Dwarfs

CDS comments: Fig.1 : L0 standard 2MASS 0345 is 2MASS J03454316+2540233 (= V* V1226 Tau)

Simbad objects: 14

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