Vol. 643
7. Stellar structure and evolution

Understanding and improving the timing of PSR J0737-3039B

by A. Noutsos, G. Desvignes, M. Kramer, et al. 2020, A&A, 643, A143

The double pulsar (PSR J07373039A/B) is the only known system consisting of two radio pulsars in a 2.5hr orbit. Given its unique characteristics, and thanks to its incredible inclination of 89 degrees, it is our best laboratory for general relativity studies. Past studies have concentrated on pulsar A, a recycled millisecond pulsar spinning at 23 ms. Pulsar B is a normal pulsar spinning at 2.8 s. Being less powerful by a factor of ~3500, pulsar B is heavily embedded in the relativistic wind of pulsar A. In this paper, Noutsos and collaborators study pulsar B in detail, notably its emission during the time interval 2004-2008 when the pulsar was detectable before moving away from the line of sight due to geodetic precession. They have developed a model for the pulsar emission beam and its interaction with pulsar A's wind, and they make predictions for 2024 when pulsar B should become visible again. This will allow for more precise testing of the geodetic precession.