Enhanced gravitational wave emission from perturbed wide binaries

Astronomy and Astrophysics – Astronomy

Scientific paper

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Binary Stars, Black Holes (Astronomy), Gravitational Waves, Orbit Perturbation, Stellar Orbits, Stellar Radiation, Eccentric Orbits, Supermassive Stars

Scientific paper

Wide binaries are generally ignored as potential sources of gravitational radiation. Attention is usually focused on close circular systems. This paper discusses the possibility that wide binary systems may become important sources of gravitational radiation if one of the components collapses to a black hole and recoils in the process. It is found that such an orbital perturbation can give rise to highly eccentric binaries with reasonably high probability. These systems compete with the close binary systems both in terms of their gravitational wave luminosity and their duration of emission. The characteristics of the gravitational radiation emitted are, however, quite different. Typical values of the dimensionless amplitude and the frequency of the gravitational wave emission are calculated. This effect is found to be of most significance in the context of VMO (very massive object) binary systems.

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