Galaxy mergers produce supermassive black hole binaries, which emitgravitational waves prior to their coalescence. We perform three-dimensionalhydrodynamic simulations to study the tidal disruption of stars by such abinary in the final centuries of its life. We find that the gas stream of thestellar debris moves chaotically in the binary potential and forms accretiondisks around both black holes. The accretion light curve is modulated over thebinary orbital period owing to relativistic beaming. This periodic signalallows to detect the decay of the binary orbit due to gravitational waveemission by observing two tidal disruption events that are separated by morethan a decade.
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