Polarimetry of the potential binary supermassive black hole system in J1430+2303 F. Marin, D. Hutsemékers, I. Liodakis, R. Antonucci, N. Mandarakas, E. Lindfors, D. Blinov, T. Barnouin and D. Savić A&A, 673 (2023) A126 Published online: 17 May 2023 DOI: 10.1051/0004-6361/202346115