2FGL J1653.6−0159: A NEW LOW IN EVAPORATING PULSAR BINARY PERIODS

@article{Romani20142FGLJA,
  title={2FGL J1653.6−0159: A NEW LOW IN EVAPORATING PULSAR BINARY PERIODS},
  author={Roger W. Romani and Alexei V. Filippenko and S. Bradley Cenko},
  journal={The Astrophysical Journal Letters},
  year={2014},
  volume={793}
}
We have identified an optical binary with orbital period Pb = 4488 s as the probable counterpart of the Fermi source 2FGL J1653.6−0159. Although pulsations have not yet been detected, the source properties are consistent with an evaporating millisecond pulsar binary; this Pb = 75 minutes is the record low for a spin-powered system. The heated side of the companion shows coherent radial-velocity variations, with amplitude K = 666.9 ± 7.5 km s−1 for a large mass function of f(M) = 1.60 ± 0.05 M… 

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