Journal
SCIENCE
Volume 324, Issue 5933, Pages 1411-1414Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1172740
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Funding
- West Virginia Experimental Program to Stimulate Competitive Research (EPSCoR)
- Alfred P. Sloan fellow
- NWO Veni Fellow
- Lorne Trottier Chair in Astrophysics and Cosmology
- Canada Research Chair program
- NSERC
- Fonds Quebecois de la Recherche sur la Nature et les Technologies
- Canadian Institute for Advanced Research
- Canada Foundation for Innovation (CFI)
- Australia Telescope National Facility Distinguished Visitor program
- Swinburne University of Technology Visiting Distinguished Researcher Scheme
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Radio pulsars with millisecond spin periods are thought to have been spun up by the transfer of matter and angular momentum from a low-mass companion star during an x-ray-emitting phase. The spin periods of the neutron stars in several such low-mass x-ray binary (LMXB) systems have been shown to be in the millisecond regime, but no radio pulsations have been detected. Here we report on detection and follow-up observations of a nearby radio millisecond pulsar (MSP) in a circular binary orbit with an optically identified companion star. Optical observations indicate that an accretion disk was present in this system within the past decade. Our optical data show no evidence that one exists today, suggesting that the radio MSP has turned on after a recent LMXB phase.
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