Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002a%26a...383l..15l&link_type=abstract
Astronomy and Astrophysics, v.383, p.L15-L18 (2002)
Astronomy and Astrophysics
Astrophysics
14
Stars: Formation, Stars: Pre-Main Sequence, Stars: Low-Mass, Brown Dwarfs, Infrared: Stars, Techniques: Photometric, Techniques: Spectroscopic
Scientific paper
In this letter, we report the discovery of the first young early L-dwarf in the Serpens cloud. It is obscured by more than ten magnitudes of visual absorption and was found during a near infrared (NIR) photometric survey of a 50 square arcmin area in the Serpens cloud, deep enough to probe the substellar domain. After selection from NIR colour-magnitude and colour-colour diagrams, its substellar nature has been confirmed by NIR spectroscopy at the VLT. We estimate the mass of this brown dwarf to be ~ 0.05 Msun and its age to be ~ 3.5 Myr. From its NIR indices, we estimate its present spectral type to be L0-L3, and using a model its future spectral type to be T. This is the first young brown dwarf ever found deeply embedded in a star formation region. Based on observations collected with NTT/SOFI and VLT/ISAAC instruments at the European Southern Observatories, La Silla and Paranal, Chile (ESO Programmes P63.L-0227 and P65.L-0637).
Caux Emmanuel
Klotz Alain
Lodieu Nicolas
Monin Jean-Louis
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