Arecibo PALFA survey and Einstein@Home: Binary pulsar discovery by volunteer computing
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Abstract
- We report the discovery of the 20.7 ms 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 9.4 hr, a projected orbital radius of 2.8 lt-s, and a mass function of f = 0.15M(circle dot) by analysis of spin period measurements. No evidence of orbital eccentricity is apparent; we set a 2 sigma upper limit e less than or similar to 1.7 x 10(-3). The orbital parameters suggest a massive white dwarf companion with a minimum mass of 0.95 M-circle dot, assuming a pulsar mass of 1.4 M-circle dot. 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.
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| File | Nice-AstrophysicalJournalLetters-vol732-2011.pdf | Uploaded 2019-10-20 | Public | Download |
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