Measurement of Orbital Decay in the Double Neutron Star Binary PSR B2127+11C

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 $(-3.95\pm 0.13)\times 10^{-12}$, consistent with the prediction of general relativity at the $\sim 3$ level. We find the pulsar mass to be $m_p=(1.358\pm 0.010)M_{\odot }$ and the companion mass $m_c=(1.354\pm 0.010)M_{\odot }$. 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.

12 pages, 4 figures, accepted for publication in ApJL

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