Disks around Young Brown Dwarfs

Details Disks around Young Brown Dwarfs Disks around Young Brown Dwarfs

2002-07-22

arxiv.org/abs/astro-ph/0207477v1

Astronomy and Astrophysics

Astrophysics

4 pages; to appear in Proceedings of IAU 211: Brown Dwarfs, in press

Scientific paper

We present some results from a systematic survey for disks around spectroscopically identified young brown dwarfs and very low mass stars. We find that ~75% of our sample show intrinsic IR excesses, indicative of circum(sub)stellar disks. The observed excesses are correlated with Halpha emission, consistent with a common disk accretion origin. Because the excesses are modest, conventional analyses using only IR colors would have missed most of the sources with disks. In the same star-forming regions, we find that disks around brown dwarfs and T Tauri stars are contemporaneous; assuming coevality, this demonstrates that substellar disks are at least as long-lived as stellar disks. Altogether, the frequency and properties of circumstellar disks are similar from the stellar regime down to the substellar and planetary-mass regime. This offers compelling evidence of a common origin for most stars and brown dwarfs.

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