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We explore the predictions for detectable gravitational-wave signals frommerging binary black holes formed through chemically homogeneous evolution inmassive short-period stellar binaries. We find that $\sim 500$ events per yearcould be detected with advanced ground-based detectors operating at fullsensitivity. We analyze the distribution of detectable events, and concludethat there is a very strong preference for detecting events with nearly equalcomponents (mass ratio $>0.66$ at 90\% confidence in our default model) andhigh masses (total source-frame mass between $57$ and $103\, M_\odot$ at 90\%confidence). We consider multiple alternative variations to analyze thesensitivity to uncertainties in the evolutionary physics and cosmologicalparameters, and conclude that while the rates are sensitive to assumedvariations, the mass distributions are robust predictions. Finally, we considerthe recently reported results of the analysis of the first 16 double-coincidentdays of the O1 LIGO (Laser Interferometer Gravitational-wave Observatory)observing run, and find that this formation channel is fully consistent withthe inferred parameters of the GW150914 binary black hole detection and theinferred merger rate.

monthly notices of the royal astronomical society

The chemically homogeneous evolutionary channel for binary black hole  mergers: rates and properties of gravitational-wave events detectable by  advanced LIGO