PSR J0737-3039

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PSR J0737–3039

A double radio pulsar system in the southern constellation Puppis and the first such system to be discovered. One component, a 23-millisecond pulsar now known as PSR J0737–3039 A, was discovered in 2003 by an international team of scientists using the 64-meter CSIRO radio telescope at the Parkes Observatory in New South Wales, Australia. At first it was assumed that this pulsar was orbiting a non-pulsing neutron star, but further observations made with the Parkes dish and the 76-meter Lovell radio telescope at the University of Manchester's Jodrell Bank Observatory in Cheshire, England, UK, revealed that the companion, now designated PSR J0737–3039 B, had a detectable slow pulse, rotating once every 2.8 seconds. The two pulsars are an estimated 800 000 kilometers apart and orbit around a common center of mass once every 2.4 hours. By chance the orbit appears edge-on, and each pulsar periodically eclipses the other, allowing researchers for the first time to analyze the physical conditions of a pulsar's magnetosphere or outer atmosphere. It is thought that the double-pulsar system evolved when, following the supernova explosion of the more massive PSR J0737–3039 A and its transformation into a pulsar, a companion star was born and eventually developed into a giant. Material from the giant was accreted on the pulsar by mass transfer, making it spin faster. In time, the giant also exploded as a supernova and it too developed into a pulsar. Powerful gravitational forces are drawing the pulsars closer to each other, and scientists estimate that they will coalesce in 85 million years' time, possibly forming a black hole. Distance: 500–600 pc. See pulsar.
References in periodicals archive ?
Their astronomical discoveries related to the discovery of the universe of double pulsar PSR B1913+16 R.
after 17 years of his careful astrophysical study of said continuously varying in sizes double pulsar, by measuring the declining orbit of the pair of amazing stars found confirmation of general relativity [2, 18].
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But the gravitational time delay in the Double Pulsar is much larger.
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