A 2.1 M☉ Pulsar Measured by Relativistic Orbital Decay

  title={A 2.1 M☉ Pulsar Measured by Relativistic Orbital Decay},
  author={David J. Nice and Eric M. Splaver and Ingrid H. Stairs and Oliver Loehmer and Axel Jessner and Michael Kramer and James M. Cordes},
  journal={The Astrophysical Journal},
PSR J0751+1807 is a millisecond pulsar in a circular 6 hr binary system with a helium white dwarf secondary. Through high-precision pulse timing measurements with the Arecibo and Effelsberg radio telescopes, we have detected the decay of its orbit due to emission of gravitational radiation. This is the first detection of the relativistic orbital decay of a low-mass, circular binary pulsar system. The measured rate of change in orbital period, corrected for acceleration biases, is = (-6.4 ± 0.9… 

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