We report the discovery of the 20.7ms binary pulsar J1952+2630, made using the distributed computing project Einstein@Home in Pulsar ALFA survey observations with the Arecibo telescope. Follow-up observations with the Arecibo telescope confirm the binary nature of the system. We obtain a circular orbital solution with an orbital period of 9.4hr, a projected orbital radius of 2.8lt-s, and a mass function of f = 0.15 M âŠ™ by analysis of spin period measurements. No evidence of orbital eccentricity is apparent; we set a 2Ïƒ upper limit e â‰² 1.7 Ã— 10 -3 . The orbital parameters suggest a massive white dwarf companion with a minimum mass of 0.95 M âŠ™ , assuming a pulsar mass of 1.4 M âŠ™ . Most likely, this pulsar belongs to the rare class of intermediate-mass binary pulsars. Future timing observations will aim to determine the parameters of this system further, measure relativistic effects, and elucidate the nature of the companion star. Â© 2011. The American Astronomical Society. All rights reserved.
B. Knispel, et. al., (2011) Arecibo PALFA survey and Einstein@Home: Binary pulsar discovery by volunteer computing.Astrophysical Journal Letters732:1. DOI: http://doi.org/10.1088/2041-8205/732/1/L1
Astrophysical Journal Letters