Black hole–neutron star mergers: The first mass gap and kilonovae P. Drozda, K. Belczynski, R. O’Shaughnessy, T. Bulik and C. L. Fryer A&A, 667 (2022) A126 Published online: 16 November 2022 DOI: 10.1051/0004-6361/202039418