Astrophysics > Astrophysics of Galaxies
[Submitted on 25 Feb 2011 (v1), last revised 7 Apr 2011 (this version, v2)]
Title:Arecibo PALFA Survey and Einstein@Home: Binary Pulsar Discovery by Volunteer Computing
View PDFAbstract: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 = 0.15 solar masses by analysis of spin period measurements. No evidence of orbital eccentricity is apparent; we set a 2-sigma upper limit e < 1.7e-3. The orbital parameters suggest a massive white dwarf companion with a minimum mass of 0.95 solar masses, assuming a pulsar mass of 1.4 solar masses. 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.
Submission history
From: Benjamin Knispel [view email][v1] Fri, 25 Feb 2011 21:00:04 UTC (361 KB)
[v2] Thu, 7 Apr 2011 09:22:55 UTC (360 KB)
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