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Exoplanet discoveries have demonstrated a vast range of planetary systemarchitectures. The demographic of compact planetary systems are especiallyinteresting from the perspective of planetary formation and the evolution oforbital dynamics. Another interesting demographic is that of giant planets ineccentric orbits, since these planets have likely had a dynamical historyinvolving planet-planet scattering events. The WASP-47 system is particularlyfascinating since it combines these two demographics, having both compactplanetary orbits and a giant planet on an eccentric orbit within the systemHabitable Zone. Here we provide an analysis of the WASP-47 system from theperspective of atmospheric detection and characterization. We discuss thesystem architecture and the potential for additional long-period planets. Wesimulate expected phase variations as a function of planet orbital phase forthe system due to the combined effect of the planets. We present analysis ofprecision photometry of WASP-47 from the K2 mission, phased on each of theplanets. The analysis rules out the detection of phase signatures for the twoinner-most planets, enabling constraints upon their albedos and atmosphericproperties. Our study concludes that WASP-47b is an example of a "dark" planetwith a tentative geometric albedo of 0.016 and a 1$\sigma$ upper limit of 0.17.The WASP-47e data are consistent with a broad range of albedos, but also showearly evidence of having a relatively low albedo. The growing number of dark,short-period giant planets provide the framework of an ideal sample forstudying low albedo dependence on atmospheric composition.

The Dark Planets of the WASP-47 Planetary System