期刊
ASTRONOMY & ASTROPHYSICS
卷 383, 期 3, 页码 L15-L18出版社
E D P SCIENCES
DOI: 10.1051/0004-6361:20020034
关键词
stars : formation; stars : pre-main sequence; stars : low-mass; brown dwarfs; infrared : stars; techniques : photometric; techniques : spectroscopic
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 similar to0.05 M-. and its age to be similar to3.5 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.
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