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EINSTEIN@HOME Discovery - Binary Radio Pulsar

(Feb 28, 2011 7:21 PM)

A new preprint reports the second Einstein@Home discovery, of a radio pulsar orbiting a white dwarf star once every 9.4 hours. The pulsar, called J1952+2630, is spinning on its axis 48 times per second. It was discovered in data collected at Arecibo Observatory in 2005 by the PALFA Collaboration. The white-dwarf companion star is unusually massive, and weighs at least 95% as much as our sun. This means that J1952+2630 probably belongs to a rare class of intermediate-mass binary pulsars (five were previously known). Congratulations to the two Einstein@Home participants whose computers found J1952+2630 with the highest significance: Dr. Vitaliy V. Shiryaev (Moscow, Russia) and Stacey Eastham (Darwen, UK)! And a big "thank you" to all Einstein@Home volunteers, whose continuing support makes these exciting discoveries possible. Bruce Allen Director, Einstein@Home

- [Discovery Forum Thread]

Arecibo PALFA Survey and Einstein@Home:

Binary Pulsar Discovery by Volunteer Computing

(Submitted on 25 Feb 2011)

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.

- [source]

The document entitled "ARECIBO PALFA SURVEY AND EINSTEIN@HOME: BINARY PULSAR DISCOVERY BY VOLUNTEER COMPUTING" is available in PDF format hosted here (DRAFT VERSION MARCH 1, 2011): 1102.5340v1.pdf, and officially at http://arxiv.org/abs/1102.5340

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For those of you wondering what the EINSTEIN@HOME Project is:

My name is Andy Wright - the founder, but really the creator of Team FreeBSD. If you want me to add any links, or have any questions or inclinations for such things related to our group (or to just say hi) - send me an e-mail: einstein@extracted.org or Skype name: extracted

''It would be possible to describe everything scientifically, but it would make no sense; it would be without meaning, as if you described a Beethoven symphony as a variation of wave pressure'' -- Albert Einstein

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05/15/2012 07:21 AM
Einstein@Home GPU Application for ATI/AMD Graphics Cards
After more than a year of work by Oliver Bock, Bernd Machenschalk, Heinz-Bernd Eggenstein and other developers, we are pleased to announce the release of the first Einstein@Home application for ATI/AMD Graphics Cards. This OpenCL application, which searches Arecibo data for new radio pulsars, is about a factor of ten faster than the same search running on a typical CPU. The application is currently available for Windows and Linux computers with Radeon HD 5000 or better graphics cards. We hope to have a version for Macintosh (Apple OS X 10.8, Mountain Lion) sometime this summer, but there are still some problems that need to be fixed or worked around. Volunteers who wish to run this application will need to install version 7.0.27 or later of the BOINC client. Please see this thread for more information, or if you want to ask questions. Many thanks to the AMD/ATI team for their support in the OpenCL software development effort. Bruce Allen Director, Einstein@Home

05/15/2012 03:36 AM
Einstein@Home volunteers discover three new radio pulsars in Arecibo data
Einstein@Home volunteers have discovered three new radio pulsars (J1901+0510, J1858+0319, and J1857+0259) in Arecibo PALFA data! Congratulations to:

• John A. Lorimer Jr. (USA)
• Ugur Munir Kir, Guzel Sanatlar Saatchi & Saatchi (Turkey)
• Philipp Kählitz (Germany)
• Termit (Russia)
• Philemon1752 (Switzerland)
• edgen (Russia)

Further details about these and our other newly-discovered pulsars can be found on this web page, and will be published in due course. Bruce Allen Director, Einstein@Home