Gravitational waveforms for unequal mass black hole binaries detectable by KAGRA

TL;DR

This paper derives spin-dominated gravitational waveforms for unequal mass black hole binaries during the inspiral phase, focusing on their detectability by the KAGRA detector, and presents the duration these signals are observable.

Contribution

It introduces a new class of waveforms called Spin-Dominated Waveforms (SDW) for unequal mass black hole binaries, derived during the inspiral phase with dominant spin effects.

Findings

SDWs are characterized as a double expansion in post-Newtonian parameters.

The paper estimates the time SDWs are detectable by KAGRA.

First calculation of the duration of SDWs in KAGRA's sensitivity range.

Abstract

Gravitational waveforms generated by unequal mass black hole binaries are expected to be common sources for future gravitational wave detectors. We derived the waveforms emitted by such systems during the last part of the inspiral, when the larger spin dominates over the orbital angular momentum and the smaller spin is negligible. These Spin-Dominated Waveforms (SDW) arise as a double expansion in the post-Newtonian parameter and another parameter proportional to the ratio of the orbital angular momentum and the dominant spin. The time spent by the gravitational wave as an SDW in the sensitivity range of the KAGRA detector is presented for the first time.