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We study the effect of neutrino trapping in new-born quark stars within athree-flavor Nambu - Jona-Lasinio (NJL) model with self-consistently calculatedquark masses. The phase diagrams and equations of state for charge neutralquark matter in beta-equilibrium are presented, with and without trappedneutrinos. The compact star sequences for different neutrino untrappingscenarios are investigated and the energy release due to neutrino untrapping isfound to be of the order of 10^53 erg. We find that hot quark starscharacterized, e.g., by an entropy per baryon of 1-2 and a lepton fraction of0.4, as models for the cores of newborn protoneutron stars, are in thetwo-flavor color superconducting (2SC) state. High temperatures and/or neutrinochemical potentials disfavor configurations with a color-flavor-locked (CFL)phase. Stable quark star solutions with CFL cores exist only at lowtemperatures and neutrino chemical potentials.Comment: 18 pages, 25 figures, accepted for publication in Phys. Rev. D.  Updated references and acknowledgement

Quark core of protoneutron stars in the phase diagram of quark matter