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Champion DJ Ransom SM Lazarus P Camilo F Bassa C Kaspi VM Nice DJ Freire PC Stairs IH van Leeuwen J Stappers BW Cordes JM Hessels JW Lorimer DR Arzoumanian Z Backer DC Bhat ND Chatterjee S Cognard I Deneva JS Faucher-Giguère CA Gaensler BM Han J Jenet FA Kasian L Kondratiev VI Kramer M Lazio J McLaughlin MA Venkataraman A Vlemmings W 《Science (New York, N.Y.)》2008,320(5881):1309-1312
Binary pulsar systems are superb probes of stellar and binary evolution and the physics of extreme environments. In a survey with the Arecibo telescope, we have found PSR J1903+0327, a radio pulsar with a rotational period of 2.15 milliseconds in a highly eccentric (e = 0.44) 95-day orbit around a solar mass (M(middle dot in circle)) companion. Infrared observations identify a possible main-sequence companion star. Conventional binary stellar evolution models predict neither large orbital eccentricities nor main-sequence companions around millisecond pulsars. Alternative formation scenarios involve recycling a neutron star in a globular cluster, then ejecting it into the Galactic disk, or membership in a hierarchical triple system. A relativistic analysis of timing observations of the pulsar finds its mass to be 1.74 +/- 0.04 M solar symbol, an unusually high value. 相似文献
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