PSR J1753−2240: a mildly recycled pulsar in an eccentric binary system |
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| Authors: | M. J. Keith M. Kramer A. G. Lyne R. P. Eatough I. H. Stairs A. Possenti F. Camilo R. N. Manchester |
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| Affiliation: | University of Manchester, Jodrell Bank Centre for Astrophysics, Alan Turing Building, Manchester M13 9PL;Australia Telescope National Facility, CSIRO, PO Box 76, Epping, NSW 1710, Australia;Department of Physics and Astronomy, University of British Columbia, Vancouver, BC V6T 1Z1, Canada;INAF –Osservatorio Astronomico di Cagliari, Poggio dei Pini, 09012 Capoterra, Italy;Columbia Astrophysics Laboratory, Columbia University, New York, NY 10027, USA |
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| Abstract: | We report the discovery of PSR J1753−2240 in the Parkes Multibeam Pulsar Survey data base. This 95-ms pulsar is in an eccentric binary system with a 13.6-d orbital period. Period derivative measurements imply a characteristic age in excess of 1 Gyr, suggesting that the pulsar has undergone an episode of accretion-induced spin-up. The eccentricity and spin period are indicative of the companion being a second neutron star, so that the system is similar to that of PSR J1811−1736, although other companion types cannot be ruled out at this time. The companion mass is constrained by geometry to lie above 0.48 solar masses, although long-term timing observations will give additional constraints. If the companion is a white dwarf or a main-sequence star, optical observations may yield a direct detection of the companion. If the system is indeed one of the few known double neutron star systems, it would lie significantly far from the recently proposed spin-period/eccentricity relationship. |
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| Keywords: | stars: neutron pulsars: general pulsars: individual: J1753–2240 |
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