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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| Institution: | 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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