A. J. Penner

University of Southampton, Southampton, England, United Kingdom

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Publications (2)6.35 Total impact

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    ABSTRACT: We present the first fully relativistic calculations of the crustal strain induced in a neutron star by a binary companion at the late stages of inspiral, employing realistic equations of state for the fluid core and the solid crust. We show that while the deep crust is likely to fail only shortly before coalescence, there is a large variation in elastic strain, with the outermost layers failing relatively early on in the inspiral. We discuss the significance of the results for both electromagnetic and gravitational-wave astronomy.
    The Astrophysical Journal Letters 09/2011; 749(2). · 6.35 Impact Factor
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    ABSTRACT: We discuss the response of neutron stars to the tidal interaction in a compact binary system, as encoded in the Love number associated with the induced deformation. This problem is of interest for gravitational-wave astronomy as there may be a detectable imprint on the signal from the late stages of binary coalescence. Previous work has focussed on simple barotropic neutron star models, providing an understanding of the role of the stellar compactness and overall density profile. We add realism to the discussion by developing the framework required to model stars with varying composition and an elastic crust. These effects are not expected to be significant for the next generation of detectors but it is nevertheless useful to be able to quantify them. Our results show that (perhaps surprisingly) internal stratification has no impact whatsoever on the Love number. We also show that crust elasticity provides a (predictably) small correction to existing models.
    Physical review D: Particles and fields 07/2011; 84.

Publication Stats

6 Citations
6.35 Total Impact Points

Institutions

  • 2011
    • University of Southampton
      • Department of Mathematics
      Southampton, England, United Kingdom