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We present a model of the compact star in Cassiopea A that accounts for itsunusually fast cooling behavior. This feature is interpreted as an enhancementin the neutrino emission triggered by a transition from a fully gapped,two-flavor, color-superconducting phase to a crystalline phase or analternative gapless, color-superconducting phase. By fine-tuning a singleparameter -- the temperature of this transition -- a specific cooling scenariocan be selected that fits the Cas A data. Such a scenario requires a massive$M\sim 2M_{\odot}$ star and is, therefore, distinctive from models invokingcanonical 1.4 $M_{\odot}$ mass star with nucleonic pairing alone.

Rapid cooling of the compact star in Cassiopea A as a phase transition in dense QCD