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Thermal Infrared MMTAO Observations of the HR 8799 Planetary System
We present direct imaging observations at wavelengths of 3.3, 3.8 (L'band), and 4.8 (M band) ?m, for the planetary system surrounding HR8799. All three planets are detected at L' . The c and d components aredetected at 3.3 ?m, and upper limits are derived from the M-bandobservations. These observations provide useful constraints on warmgiant planet atmospheres. We discuss the current age constraints on theHR 8799 system and show that several potential co-eval objects can beexcluded from being co-moving with the star. Comparison of thephotometry is made to models for giant planet atmospheres. Models thatinclude non-equilibrium chemistry provide a reasonable match to thecolors of c and d. From the observed colors in the thermal infrared, weestimate T eff < 960 K for b and T eff = 1300and 1170 K for c and d, respectively. This provides an independent checkon the effective temperatures and thus masses of the objects from theMarois et al. results.Observations reported here were obtained at the MMT Observatory, a jointfacility of the University of Arizona and the Smithsonian Institution.
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