Abstract
We report the direct measurement of orbital period decay in the double neutron star pulsar system PSR B2127+11C in the globular cluster M15 at the rate of (-3.95 ± 0.13) × 10-12, consistent with the prediction of general relativity at the ~3% level. We find the pulsar mass to be mp = 1.358 ± 0.010 M☉ and the companion mass mc = 1.354 ± 0.010 M☉. We also report long-term pulse timing results for the pulsars PSR B2127+11A and PSR B2127+11B, including confirmation of the cluster proper motion.
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