Direct imaging of the brown dwarf/planet-mass companions to HR 8799 and GJ 758 from 1 to 5 microns: Constraints on atmospheric properties

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Scientific paper

I describe new direct imaging data obtained from the MMT and Subaru for brown dwarf/planet-mass companions to GJ 758 and HR 8799. The data were obtained at a variety of broad/narrow-band filters covering 1 to 5 microns. Combining photometry from these data with that from the research literature and comparing them with exoplanet/brown dwarf atmosphere models, I constrain the temperatures, luminosities, and masses of the companions; discuss evidence for non-equilibrium chemistry and cloud coverage; and contrast their properties with field L and T dwarfs and transiting planets.

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