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Determine from $3D$ hydrodynamics (with recombination energy, jets and post-plunge evolution) whether envelopes of $15\\ \\text{to}\\ 40\\ M_{\\mathrm{sun}}$ red supergiant donors are fully ejected, and whether final separations of a few $R_{\\mathrm{sun}}$, small enough to merge by gravitational waves within $1.4 \\times 10^{10}\\ \\mathrm{yr}$, result. Answer: final separation and ejected mass versus donor mass and radius, and the implied share of mergers from this route versus stable mass transfer.","problem_ref":"0a441ddb7c577e4fc1f88e4430a679e022128b3c40397b159fb3156aed7c2749","references":"","settled_by":"3D simulations followed to full envelope ejection or merger for massive donors, calibrated on observed post-common-envelope binaries.","status_note":"","title":"Can common-envelope ejection produce tight merging black-hole 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