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It is difficult to discover pulsars via their gamma-ray emission becausecurrent instruments typically detect fewer than one photon per millionrotations. This creates a significant computing challenge for isolated pulsars,where the typical parameter search space spans wide ranges in four dimensions.It is even more demanding when the pulsar is in a binary system, where theorbital motion introduces several additional unknown parameters. Building onearlier work by Pletsch & Clark (arXiv:1408.6962), we present optimal methodsfor such searches. These can also incorporate external constraints on theparameter space to be searched, for example, from optical observations of apresumed binary companion. The solution has two parts. The first is theconstruction of optimal search grids in parameter space via a parameter-spacemetric, for initial semicoherent searches and subsequent fully coherentfollow-ups. The second is a method to demodulate and detect the periodicpulsations. These methods have different sensitivity properties thantraditional radio searches for binary pulsars and might unveil new populationsof pulsars.

Exploiting Orbital Constraints from Optical Data to Detect Binary Gamma-ray Pulsars