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The majority of massive stars are found in close binaries which: (i) areprone to merge and (ii) are accompanied by another distant tertiary star(triples). Here, we study the evolution of the stellar post-merger binariescomposed of the merger product and the tertiary companion. We find thatpost-merger binaries originating from compact stellar triples with outersemi-major axes $a_{\rm out,init}\lesssim10^1\,-\,10^2\,\rm AU$ provide a newway to form binary black hole mergers in the galactic field. By means of apopulation synthesis, we estimate their contribution to the total black holemerger rate to be $\mathcal{R}(z=0)=0.3\,-\,25.2\,\rm Gpc^{-3}\,yr^{-1}$.Merging binary black holes that form from stellar post-merger binaries haveexceptionally low mass ratios. We identify a critical mass ratio $q\simeq0.5$below which they dominate the total black hole merger rate in the field. Weshow that after including their additional contribution, the mass ratiodistribution of binary black hole mergers in the galactic field scenario is inbetter agreement with that inferred from gravitational wave detections.

Binary black hole mergers from merged stars in the Galactic field