Discovery of a Nearby, Very Young L Dwarf

Details Discovery of a Nearby, Very Young L Dwarf Discovery of a Nearby, Very Young L Dwarf

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.7903l&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #79.03; Bulletin of the American Astronomical Society, V

Astronomy and Astrophysics

Astronomy

Scientific paper

We present the discovery of an unusual late-type L dwarf that, at a suspected distance of 6.0 pc, may be the second closest L dwarf to the Sun. We display a nearly complete 0.8-4.1 um spectrum of this object and compare it to the spectra of normal late-L dwarfs. The comparison demonstrates its many peculiarities -a triangular-shaped H-band peak, an extremely red J-Ks color, and excess flux at L-band -which we attribute to low gravity. The low gravity implies a young age of between a few Myr and a few tens of Myr. At such a young age and with such a late spectral type, its mass may lie below the deuterium burning limit, M<13M_Jup. We also present kinematic data in an attempt to associate this object with one of the young, nearby stellar associations such as beta Pic, TW Hya, AB Dor, and Tucana-Horologium. This object's proximity to earth, late spectral type, and solitary nature make it an excellent benchmark in the study of low-temperature, young brown dwarfs.

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