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We study a family of equations of state for hybrid neutron star matter. Thehybrid EOS are obtained by a Maxwell construction of the first-order phasetransition between a hadronic phase described by the relativisticdensity-functional EOS of the "DD2" class with excluded volume effects and adeconfined quark matter phase modeled by an instantaneous nonlocal version ofthe Nambu-Jona-Lasinio model in SU(2)$_f$ with vector interactions and colorsuperconductivity. The form factor in the nonlocal quark matter model is fittedto lattice QCD results in the Coulomb gauge. Owing to strong coupling in thevector meson and diquark channels, a coexistence phase of colorsuperconductivity and chiral symmetry breaking occurs. Our results show anapproximately constant behavior for the squared speed of sound with values of0.4 - 0.6 in the density region relevant for neutron star interiors. Tosimultaneously fulfill the constraints from the Neutron Star InteriorComposition Explorer radius measurement for PSR J0740+6620 and tidaldeformability from GW170817 it is necessary to consider a $\mu$-dependent bagpressure that mimics confinement.

Quark-nuclear hybrid equation of state for neutron stars under modern observational constraints