The double pulsar system PSR J0737-3039 offers an unprecedented opportunity for studying General Relativity and neutron-star magnetospheres. This system has a favourable orbital inclination such that the millisecond pulsar, "A", is eclipsed when its slower companion, "B", passes in front. High time resolution light curves of the eclipses reveal periodic modulations of the radio flux corresponding to the fundamental and the first harmonic of pulsar B spin frequency. Eclipse modelling is highly sensitive to the geometrical configuration of the system and thus provides a unique probe for parameters like the inclination angle of pulsar "B" spin axis as well as their time evolution due to relativistic effects. We report on detailed fitting of the pulsar A eclipse light curves to a model that includes, for pulsar B, a simple dipolar magnetic field. We find that the eclipses can be reproduced very well, and we obtain precise measurements of pulsar B's orientation in space. We report on a search for secular changes caused by geodetic precession of pulsar B's spin axis.
|Title of host publication||IAU Joint Discussion|
|Publication status||Published - Aug 2006|