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Research ArticlesA Double-Pulsar System: A Rare Laboratory for Relativistic Gravity and Plasma PhysicsThe clocklike properties of pulsars moving in the gravitational fields of their unseen neutron-star companions have allowed unique tests of general relativity and provided evidence for gravitational radiation. We report here the detection of the 2.8-second pulsar J07373039B as the companion to the 23-millisecond pulsar J07373039A in a highly relativistic double neutron star system, allowing unprecedented tests of fundamental gravitational physics. We observed a short eclipse of J07373039A by J07373039B and orbital modulation of the flux density and the pulse shape of J07373039B, probably because of the influence of J07373039A's energy flux on its magnetosphere. These effects will allow us to probe magneto-ionic properties of a pulsar magnetosphere.
1 Jodrell Bank Observatory, University of Manchester, Macclesfield SK11 9DL, UK. * To whom correspondence should be addressed. E-mail: agl{at}jb.man.ac.uk
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Science. ISSN 0036-8075 (print), 1095-9203 (online)