2020/12/31 by Andrea Passamonti, Nils Andersson, Pantelis Pnigouras · 2 citations
Physics and Astronomy · #astro-ph.HE
paper · pdf · doi:10.1093/mnras/stab870
23 pages, 12 figures and 6 tables. Version accepted for publication in MNRAS
arxiv created 2021/04/16 · arxiv updated 2021/04/19
We consider the dynamical tidal response of a neutron star in an inspiralling binary, focussing on the impact of the star's elastic crust. Within the context of Newtonian gravity, we add the elastic aspects to the theoretical formulation of the problem and quantify the dynamical excitation of different classes of oscillation modes. The results demonstrate the expectation that the fundamental mode dominates the tidal response and show how the usual tidal deformability (and the Love number) emerge in the static limit. In addition, we consider to what extent the different modes may be excited to a level where the breaking strain of the crust would be exceeded (locally). The results show that the fundamental mode may fracture the crust during the late stages of inspiral. This is also the case for the first gravity mode, which reaches the breaking threshold in strongly stratified stars. In our models with a fluid ocean, interface modes associated with the crust-ocean transition may also induce crust fracture. If this happens it does so earlier in the inspiral, at a lower orbital frequency.