Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-05-22
Astron.J.126:1515,2003
Astronomy and Astrophysics
Astrophysics
accepted for publication in The Astronomical Journal
Scientific paper
10.1086/377144
Recent surveys have identified sub-stellar objects down to planetary masses in nearby star-forming regions. Reliable determination of the disk frequency in young brown dwarfs is of paramount importance to understanding their origin. Here we report the results of a systematic study of infrared L'-band (3.8-micron) disk excess in ~50 spectroscopically confirmed objects near and below the sub-stellar boundary in several young clusters. Our observations, using the ESO Very Large Telescope, Keck I and the NASA Infrared Telescope Facility, reveal that a significant fraction of brown dwarfs harbor disks at a very young age. Their inner disk lifetimes do not appear to be vastly different from those of disks around T Tauri stars. Our findings are consistent with the hypothesis that sub-stellar objects form via a mechanism similar to solar-mass stars.
Ardila David R.
Haisch Karl E. Jr.
Jayawardhana Ray
Stelzer Beate
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