Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aipc.1094..172s&link_type=abstract
COOL STARS, STELLAR SYSTEMS AND THE SUN: Proceedings of the 15th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun.
Astronomy and Astrophysics
Astronomy
Low Luminosity Stars, Subdwarfs, And Brown Dwarfs, Astronomical And Space-Research Instrumentation, Extrasolar Planetary Systems
Scientific paper
We fit theoretical model atmospheres to the spectral energy distribution of 21 L and T dwarfs recently observed with the Spitzer Space Telescope to identify and isolate four key physical parameters used in the model characterization of their atmospheres. The wide range of wavelengths observed (~0.6 to 14.5 μm) lets us constrain almost independently the four model parameters used to describe these photospheres: effective temperature (Teff), grain sedimentation (fsed), vertical gas transport efficiency (Kzz), and gravity. We find that the ratio of the mid-infrared to near-infrared flux is a good indicator of Teff, while the slope in the near-infrared is strongly dependent on fsed. The CH4 bands found at 2, 3 and 8 μm are sensitive to the timescale for vertical mixing, and gravity will influence the flux at 2 μm.
Cushing Michael. C.
Fan Xiaohui
Geballe Thomas Ronald
Golimowski David A.
Leggett Sandy K.
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