Thermal Evolution and Light Curves of Young Bare Strange Stars

We study numerically the cooling of a young bare strange star and show that its thermal luminosity, mostly due to e⁺e^- pair production from the quark surface, may be much higher than the Eddington limit. The mean energy of photons far from the strange star is ∼10²   keV or even more. This differs both qualitatively and quantitatively from the thermal emission from neutron stars and provides a definite observational signature for bare strange stars. It is shown that the energy gap of superconducting quark matter may be estimated from the light curves if it is in the range from ∼0.5   MeV to a few MeV.