Observational Clues to Brown Dwarf Origins

Details Observational Clues to Brown Dwarf Origins Observational Clues to Brown Dwarf Origins

2003-06-11

arxiv.org/abs/astro-ph/0306240v1

Astronomy and Astrophysics

Astrophysics

to appear in proceedings of the conference on "Open Issues in Local Star Formation and Early Stellar Evolution" held in Ouro P

Scientific paper

Over the past year, we have conducted a multi-faceted program to investigate the origin and early evolution of brown dwarfs. Using high-resolution Keck optical spectra of ~30 objects near and below the sub-stellar boundary in several star-forming regions, we present compelling evidence for a T Tauri-like accretion phase in young brown dwarfs. Our systematic study of infrared L'-band (3.8-micron) disk excess in ~50 spectroscopically confirmed young very low mass objects 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. Taken together, our findings are consistent with a common origin for most low-mass stars, brown dwarfs and isolated planetary mass objects.

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