Schedule Apr 02, 2010
Exoplanet Albedo Spectra and Colors as a Function of Orbital Phase, Separation, and Metallicity
Kerri Cahoy (NASA/Ames)

K. Cahoy1; M. Marley1; J. J. Fortney2; R. Freedman1; K. Lodders3
1. NASA Ames Research Center, Stanford, CA, United States.
2. University of California Santa Cruz, Santa Cruz, CA, United States.
3. Washington University in St. Louis, St. Louis, MO, United States.

We examine how exoplanet albedo spectra and colors change as a function of orbital phase, separation, and metallicity for Jupiter and Neptune analogs from 0.35 to 1 micron. These reflected light radiative transfer simulations model changes in albedo spectra due to both different compositions and different incident and reflected light paths through the atmosphere. Simulations are performed for model Jupiters with 1 and 3 times solar metallicity and Neptunes with 10 and 30 times solar metallicity at separations between 0.8 and 10 AU around a solar analog. The resulting albedo spectra are useful for understanding the range of variability in observations of reflected light from exoplanets and for deriving direct imaging instrument requirements. These results are also used to compute the colors of exoplanets for future comparison with direct imaging observations.

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