Chemically homogeneous evolution: a rapid population synthesis approach

ABSTRACT We explore chemically homogeneous evolution (CHE) as a formation channel for massive merging binary black holes (BBHs). develop methods to include CHE in rapid population synthesis code, Compact Object Mergers: Population Astrophysics and Statistics (compas), which combines realistic models of with cosmological the star history Universe. For first time, we simultaneously conventional isolated under same set assumptions. This approach allows us constrain properties make simultaneous predictions about gravitational-wave detection rates BBH mergers channels. The overall mass distribution detectable BBHs is consistent existing observations. find that may yield up ${\sim} 70{{\ \rm per\ cent}}$ all detections coming from evolution.