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The dynamical tide in a coalescing neutron star binary induces phase shiftsin the gravitational waveform as the orbit sweeps through resonances withindividual g-modes. Unlike the phase shift due to the equilibrium tide, thephase shifts due to the dynamical tide are sensitive to the stratification,composition, and superfluid state of the core. We extend our previous study ofthe dynamical tide in superfluid neutron stars by allowing for hyperons in thecore. Hyperon gradients give rise to a new type of composition g-mode. Comparedto g-modes due to muon-to-electron gradients, those due to hyperon gradientsare concentrated much deeper in the core and therefore probe higher densityregions. We find that the phase shifts due to resonantly excited hyperonicmodes are ~ 10^{-3} rad, an order of magnitude smaller than those due to muonicmodes. We show that by stacking events, third generation gravitational-wavedetectors should be able to detect the phase shifts due to muonic modes. Thosedue to hyperonic modes will, however, be difficult to detect due to theirsmaller magnitude.

monthly notices of the royal astronomical society

Dynamical tides in coalescing superfluid neutron star binaries with  hyperon cores and their detectability with third generation  gravitational-wave detectors