Physics – Optics
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21560602d&link_type=abstract
American Astronomical Society, AAS Meeting #215, #606.02; Bulletin of the American Astronomical Society, Vol. 36, p.1130
Physics
Optics
Scientific paper
We have been using Keck laser guide star adaptive optics to monitor the orbits of ultracool binaries, providing dynamical masses at lower luminosities and temperatures than previously available and enabling strong tests of theoretical models. (1) We find that model color-magnitude diagrams cannot reliably be used to infer masses as they do not accurately reproduce the colors of ultracool dwarfs of known mass. (2) Effective temperatures inferred from evolutionary model radii can be inconsistent with temperatures derived from fitting observed spectra with atmospheric models by at most 100-300 K. (3) For the single pair of field brown dwarfs with a precise mass (3%) and age determination ( 25%), the measured luminosities are a factor of 2-3 higher than predicted by model cooling rates (masses inferred from Lbol and age using models are 20-30% larger than measured). Finally, as the sample of binaries with measured orbits grows, novel tests of brown dwarf formation theories are made possible, e.g., by comparing the observed eccentricity distribution to those predicted by theoretical simulations.
Dupuy Trent J.
Ireland Michael J.
Liu Michael C.
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