  The characterization of planetary atmospheres is a daunting task, pushing
current observing facilities to their limits. The next generation of
high-resolution spectrographs mounted on large telescopes -- such as
ESPRESSO@VLT and HIRES@ELT -- will allow us to probe and characterize
exoplanetary atmospheres in greater detail than possible to this point. We
present a method that permits the recovery of the colour-dependent reflectivity
of exoplanets from high-resolution spectroscopic observations. Determining the
wavelength-dependent albedo will provide insight into the chemical properties
and weather of the exoplanet atmospheres.
  For this work, we simulated ESPRESSO@VLT and HIRES@ELT high-resolution
observations of known planetary systems with several albedo configurations. We
demonstrate how the cross correlation technique applied to theses simulated
observations can be used to successfully recover the geometric albedo of
exoplanets over a range of wavelengths. In all cases, we were able to recover
the wavelength dependent albedo of the simulated exoplanets and distinguish
between several atmospheric models representing different atmospheric
configurations.
  In brief, we demonstrate that the cross correlation technique allows for the
recovery of exoplanetary albedo functions from optical observations with the
next generation of high-resolution spectrographs that will be mounted on large
telescopes with reasonable exposure times. Its recovery will permit the
characterization of exoplanetary atmospheres in terms of composition and
dynamics and consolidates the cross correlation technique as a powerful tool
for exoplanet characterization.
