The discovery of an eccentric millisecond pulsar in the galactic plane

David J. Champion*, Scott M. Ransom, Patrick Lazarus, Fernando Camilo, Victoria M. Kaspi, David J. Nice, Paulo C C Freire, James M. Cordes, Jason W T Hessels, Cees Bassa, Duncan R. Lorimer, Ingrid H. Stairs, Joeri Van Leeuwen, Zaven Arzoumnian, Don C. Backer, N. D Ramesh Bhat, Shami Chatterjee, Fronefield Crawford, Julia S. Deneva, Claude André Faucher-GiguèreB. M. Gaensler, Jinlin Han, Fredrick A. Jenet, Laura Kasian, Vlad I. Kondratiev, Michael Kramer, Joseph Lazio, Maura A. McLaughlin, Ben W. Stappers, Arun Venkataraman, Wouter Vlemmings

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations


The evolution of binary systems is governed by their orbital properties and the stellar density of the local environment. Studies of neutron stars in binary star systems offer unique insights into both these issues. In an Arecibo survey of the Galactic disk, we have found PSR J1903+0327, a radio emitting neutron star (a "pulsar") with a 2.15 ms rotation period, in a 95-day orbit around a massive companion. Observations in the infra-red suggests that the companion may be a main-sequence star. Theories requiring an origin in the Galactic disk cannot account for the extraordinarily high orbital eccentricity observed (0.44) or a main-sequence companion of a pulsar that has spin properties suggesting a prolonged accretion history. The most likely formation mechanism is an exchange interaction in a globular star cluster. This requires that the binary was either ejected from its parent globular cluster as a result of a three-body interaction, or that that cluster was disrupted by repeated passages through the disk of the Milky Way.

Original languageEnglish (US)
Title of host publication40 Years Of Pulsars
Subtitle of host publicationMillisecond Pulsars, Magnetars and More
Number of pages5
StatePublished - 2008
Event40 Years Of Pulsars: Millisecond Pulsars, Magnetars and More - Montreal, QC, Canada
Duration: Aug 12 2007Aug 17 2007

Publication series

NameAIP Conference Proceedings
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616


Other40 Years Of Pulsars: Millisecond Pulsars, Magnetars and More
CityMontreal, QC


  • Binary pulsars
  • Globular clusters
  • Millisecond pulsars
  • Pulsar evolution
  • Pulsars

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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