PSR J1903+0327: A Unique Millisecond Pulsar with a Main-sequence Companion Star

  title={PSR J1903+0327: A Unique Millisecond Pulsar with a Main-sequence Companion Star},
  author={Juthika Khargharia and John Thomas Stocke and Cynthia S. Froning and A. Gopakumar and Bhal Chandra Joshi},
  journal={The Astrophysical Journal},
PSR J1903+0327 is a millisecond pulsar with a mass of 1.67 M ☉ in a highly eccentric orbit (e = 0.44) around a main-sequence star. This unique system cannot be reconciled with current observations where millisecond pulsars are generally seen to orbit white dwarfs in almost exactly circular orbits. Current theoretical models of binary and stellar formation and evolution cannot explain the high eccentricity of this system either. In this work, we present three new epochs of optical spectroscopy… 

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