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

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dc.creatorLooper, Dagny L.
dc.creatorBurgasser, Adam J.
dc.creatorKirkpatrick, J. Davy
dc.creatorSwift, Brandon J.
dc.date2007-09-20
dc.date2007-10-22
dc.date.accessioned2026-07-07T10:07:55Z
dc.date.available2026-07-07T10:07:55Z
dc.descriptionWe 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 H2O absorption, weak alkali lines, and weak hydride bands. We find an optical spectral type of M9.5 and estimate a mass of <24 M_Jup, 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.
dc.description8 pages - emulateapj style, 2 figures, 3 tables. Accepted to ApJL. Fixed typos, added reference, added footnote
dc.identifierhttps://arxiv.org/abs/0709.3290
dc.identifierhttp://arxiv.org/abs/0709.3290
dc.identifier2007ApJ...669L..97L
dc.identifierdoi:10.1086/523812
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/170815
dc.subjectAstrophysics
dc.titleDiscovery of an M9.5 Candidate Brown Dwarf in the TW Hydrae Association - DENIS J124514.1-442907
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