Can a time-evolving, asymmetric broad line region mimic a massive black hole binary?Erika Sottocorno, Mary Ogborn, Lorenzo Bertassi, Fabio Rigamonti, Matteo Bonetti, Michael Eracleous and Massimo DottiA&A, 708 (2026) A153DOI: https://doi.org/10.1051/0004-6361/202555035