Other
Scientific paper
Jun 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...208.2001a&link_type=abstract
American Astronomical Society Meeting 208, #20.01; Bulletin of the American Astronomical Society, Vol. 38, p.100
Other
Scientific paper
I have combined new I, J, H, and Ks imaging of portions of the Chamaeleon II, Lupus I, and Ophiuchus star-forming clouds with 3.6 to 24 micron imaging from the Spitzer Legacy Program, "From Molecular Clouds to Planet Forming Disks", to identify a sample of 19 young stars, brown dwarfs and sub-brown dwarfs showing mid-infrared excess emission. Six of the more luminous sources in my sample have been previously identified by other surveys for young stars and brown dwarfs. Follow-up near-IR spectra for 5 members of my sample have confirmed their youth. Two of the sources have spectral types later than M9, based on their near-IR spectra. I also present a newly discovered wide-separation brown dwarf binary. My sample includes sources with luminosities as low as log(L/Lsun)=-3.1. Over three decades in luminosity, my sources have an approximately constant ratio of excess to stellar luminosity. I compare our observed SEDs to theoretical models of a central source with a passive irradiated circumstellar disk and test the effects of disk inclination, disk flaring, and the size of the inner disk hole on the strength/shape of the excess.
Allers Katelyn N.
Jaffe Daniel T.
Kessler-Silacci Jacqueline E.
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