An Adaptive Optics Survey for Brown Dwarfs in Stellar Systems

Details An Adaptive Optics Survey for Brown Dwarfs in Stellar Systems An Adaptive Optics Survey for Brown Dwarfs in Stellar Systems

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aas...20313609c&link_type=abstract

American Astronomical Society Meeting 203, #136.09; Bulletin of the American Astronomical Society, Vol. 36, p.584

Physics

Optics

Scientific paper

The Cornell High-order Adaptive Optics Survey for brown dwarfs (CHAOS) uses the Palomar Hale Telescope's adaptive optics system to survey ˜ 80 stars out to 16 parsecs. Using the telescope's AO science camera PHARO, brown dwarf companions at 4-200 AU separations can be identified through coronagraphic imaging and spectroscopy. We will then couple these data with Monte Carlo simulations to constrain the properties of brown dwarf companions to nearby stars.
We have presently finished the observational stage of our survey. As of now, no systems in the sample have shown clear evidence of having brown dwarf companions. These results support previous speculations of a "brown dwarf desert" at orbital separations out to ˜ 200 AU. We are currently using these as inpiut for our population synthesis models. These models take into account observational parameters such as target distances and magnitudes, seeing conditions, and instrument sensitivity in order to output limits such as population numbers, orbital separations, eccentricities, and mass functions. We expect the results of these simulations to arrive to be in-hand by Spring 2004. As we collect these results, we will be able to provide insights into stellar system formation and evolution.

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