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Gravitational Waveforms
The gravitational wavetrain from a promptly collapsing NSNS merger may be separated into three qualitatively different phases: inspiral, merger, and BH ringdown. During the inspiral phase, which takes up most of the binary's lifetime, gravitational wave emission gradually reduces the binary separation. The merger phase of the gravitational wavetrain is characterized by tidal disruption of the neutron stars, followed by prompt collapse to a spinning BH. Ringdown radiation is emitted as the distorted BH settles down to Kerr-like equilibrium (Note: Only in the case of a vacuum spacetime does the spinning BH obey the exact Kerr solution. The BHs formed here are surrounded by gaseous disks with small, but nonnegligible, rest mass). The h× polarization mode of the gravitational wave is shown below.