Neutron Stars in Effective Fly-Bys

Eccentric compact object (CO) binaries, such as black hole - neutron star binaries, pose not only a challenge for gravitational wave detectors, but also provide a probe into the structure of COs. At closest approach between the objects, an f-mode is excited in the neutron star while a burst of gravitational radiation is emitted. In order to model the signals from these eccentric binaries falling in the LIGO band, we have developed an effective fly-by (EFB) waveform for a black hole - neutron star binary in the post-Newtonian formalism. This waveform model captures the gravitational wave emission from the f-mode and its effect on the orbital phase. We discuss the prospect of constraining the neutron star equation of state with these EFB waveforms.