Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aas...201.2503l&link_type=abstract
American Astronomical Society, 201st AAS Meeting, #25.03; Bulletin of the American Astronomical Society, Vol. 34, p.1145
Astronomy and Astrophysics
Astronomy
Scientific paper
We present results from a large thermal IR (L'-band; 3.8 micron) survey for disks around young spectroscopically identified brown dwarfs and low mass stars. Our sample encompasses objects with spectral types from M6 to M9.5, corresponding to masses of 15 to 100 MJup and ages of a few Myr based on current models. We find that ~75% of our sample show intrinsic IR excesses, indicative of circum(sub)stellar disks. The observed excesses are well-correlated with Hα 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 work has been supported by the Beatrice Watson Parrent Fellowship at the University of Hawai`i.
Liu Michael C.
Najita Joan
Tokunaga Alan T.
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