MOMO. VI. Radio variability of OJ 287

Here, we report results from our accompanying, dense, multifrequency (1.4-44GHz) radio monitoring of OJ 287 between 2015 and 2022 covering a broad range of activity states. Fermi {gamma}-ray observations were added.

We characterize the radio flux and spectral variability in detail, including discrete correlation function and other variability analyses, and discuss its connection with the multiwavelength emission. Deep fades of the radio and optical-UV fluxes are found to occur every 1-2 yr. Further, it is shown that a precursor flare of thermal bremsstrahlung predicted by one of the binary supermassive black hole (SMBH) models of OJ 287 was absent.