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Astrophysics, High Energy Astrophysical Phenomena, astro-ph.HE,General Relativity and Quantum Cosmology, gr-qc
Abstract:
The strong tidal forces that arise during the last stages of the life of a
black hole-neutron star binary may severely distort, and possibly disrupt, the
star. Both phenomena will imprint signatures about the stellar structure in the
emitted gravitational radiation. The information from the disruption, however,
is confined to very high frequencies, where detectors are not very sensitive.
We thus assess whether the lack of tidal distortion corrections in
data-analysis pipelines will affect the detection of the inspiral part of the
signal and whether these may yield information on the equation of state of
matter at nuclear densities. Using recent post-Newtonian expressions and
realistic equations of state to model these scenarios, we find that
point-particle templates are sufficient for the detection of black hole-neutron
star inspiralling binaries, with a loss of signals below 1% for both second and
third-generation detectors. Such detections may be able to constrain
particularly stiff equations of state, but will be unable to reveal the
presence of a neutron star with a soft equation of state.
