Differential Rotation Enhanced Dissipation of Tides in the PSR J0045-7319 Binary

摘要

If the rotation in the interior of the B star is not synchronized, which we show is the case, then the work of Goldreich & Nicholson suggests that the B star should be rotating differentially, with the rotation speed of the outer layers close to the synchronous value. We show that the dissipation of the dynamical tide in such a differentially rotating B star is enhanced by almost 3 orders of magnitude, leading to an orbital evolution time for the PSR J0045-7319 binary that is consistent with the observations.