Arecibo PALFA survey and Einstein@Home: Binary pulsar discovery by volunteer computing

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Abstract

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⊙ by analysis of spin period measurements. No evidence of orbital eccentricity is apparent; we set a 2σ upper limit e ≲ 1.7 × 10-3. The orbital parameters suggest a massive white dwarf companion with a minimum mass of 0.95 M⊙, assuming a pulsar mass of 1.4 M⊙. 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. © 2011. The American Astronomical Society. All rights reserved.

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Knispel, B., Lazarus, P., Allen, B., Anderson, D., Aulbert, C., Bhat, N. D. R., … Venkataraman, A. (2011). Arecibo PALFA survey and Einstein@Home: Binary pulsar discovery by volunteer computing. Astrophysical Journal Letters, 732(1 PART II). https://doi.org/10.1088/2041-8205/732/1/L1

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