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We have obtained initial spectroscopic observations and additional photometryof the newly discovered Pb=94min gamma-ray black-widow pulsar PSR J1311-3430.The Keck spectra show a He-dominated, nearly H-free photosphere and a largeradial-velocity amplitude of 609.5+/-7.5km/s. Simultaneous seven-color GRONDphotometry further probes the heating of this companion, and shows the presenceof a flaring infrared excess. We have modeled the quiescent light curve,constraining the orbital inclination and masses. Simple heated light-curve fitsgive M_NS=2.7Msun, but show systematic light-curve differences. Adding extracomponents allows a larger mass range to be fit, but all viable solutions haveM_NS>2.1Msun. If confirmed, such a large M_NS substantially constrains theequation of state of matter at supernuclear densities.

PSR J1311-3430: A Heavyweight Neutron Star with a Flyweight Helium Companion