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We study the optical flux and polarization variability of the binary blackhole blazar OJ 287 using quasi-simultaneous observations from 2015 to 2023carried out using telescopes in the USA, Japan, Russia, Crimea, and Bulgaria.This is one of the most extensive quasi-simultaneous optical flux andpolarization variability studies of OJ 287. OJ 287 showed large amplitude, ~3.0mag flux variability, large changes of ~37% in degree of polarization, and alarge swing of ~215 degrees in the angle of the electric vector ofpolarization. During the period of observation, several flares in flux weredetected. Those flares are correlated with a rapid increase in the degree ofpolarization and swings in electric vector of polarization angle. A peculiarbehavior of anticorrelation between flux and polarization degree, accompaniedby a nearly constant polarization angle, was detected from JD 2,458,156 to JD2,458,292. We briefly discuss some explanations for the flux and polarizationvariations observed in OJ 287.

the astrophysical journal. letters

Quasi-simultaneous Optical Flux and Polarization Variability of the  Binary Super Massive Black Hole Blazar OJ 287 from 2015 to 2023: Detection of  an Anticorrelation in Flux and Polarization Variability