Magnetospheric interactions and emission properties in the double pulsar system

Our ability to observe both pulsars in the double-pulsar system, PSR J0737–3039A/B, combined with its short binary period and almost edge-on orbit, provides an unique opportunity to study pulsar magnetospheric interactions and the pulse emission mechanism. Pulses from J0737–3039A (A) are eclipsed by the magnetosphere of PSR J0737–3039B (B) which is believed to be highly distorted by the relativistic wind from A. In addition, pulses from B are modulated at the A rotational period, revealing an interaction between radiation from A and the B pulse emission mechanism. Relativistic geodetic precession of the spin axes of the two pulsars is expected. Surprisingly, no precessional effects have been observed in A, but secular changes in the B pulse profile and orbital modulation are seen. Finally, based on polarisation observations, we discuss the inclination of A’s magnetic axis relative to its spin axis.