Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 460, Issue 4, Pages 3545-3553Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stw1219
Keywords
gravitational waves; binaries: close; stars: black holes; stars: massive
Categories
Funding
- Leiden Lorentz Center workshop 'The Impact of Massive Binaries Throughout the Universe'
- Marie Sklodowska-Curie Action Incoming Fellowship [H2020 MSCA-IF-2014, 661502]
- Netherlands Research School for Astronomy (NOVA)
- STFC [ST/K000845/1, ST/N000072/1, ST/N000633/1] Funding Source: UKRI
- Marie Curie Actions (MSCA) [661502] Funding Source: Marie Curie Actions (MSCA)
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We explore the predictions for detectable gravitational-wave signals from merging binary black holes formed through chemically homogeneous evolution in massive short-period stellar binaries. We find that similar to 500 events per year could be detected with advanced ground-based detectors operating at full sensitivity. We analyse the distribution of detectable events, and conclude that there is a very strong preference for detecting events with nearly equal components (mass ratio > 0.66 at 90 per cent confidence in our default model) and high masses (total source-frame mass between 57 and 103 M-aS (TM) at 90 per cent confidence). We consider multiple alternative variations to analyse the sensitivity to uncertainties in the evolutionary physics and cosmological parameters, and conclude that while the rates are sensitive to assumed variations, the mass distributions are robust predictions. Finally, we consider the recently reported results of the analysis of the first 16 double-coincident days of the O1 LIGO (Laser Interferometer Gravitational-wave Observatory) observing run, and find that this formation channel is fully consistent with the inferred parameters of the GW150914 binary black hole detection and the inferred merger rate.
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