  Thermal emission rates and mean free paths of photons in a color-flavor
locked (CFL) phase of quark matter at high densities and moderate temperatures
are evaluated. Our calculations are based on a low-energy effective theory for
CFL matter describing Goldstone boson excitations and their electromagnetic as
well as strong interactions. In-medium coupling strengths of vector mesons are
found to be smaller than in vacuum. As a consequence of in-medium modified pion
dispersion relations, novel processes such as pi+ pi- -> gamma and gamma -> pi+
pi- become possible. The total photon emissivity is found to be very large,
exceeding contributions from thermal e+ e- annihilation above temperatures of
about 5 MeV. At the same time, the corresponding mean free paths become very
small. Our results imply that the photon flux from the surface of a
(hypothetical) CFL star in its early hot stages saturates the black-body limit.
Estimates for the early thermal evolution of the star are also presented.
