A Possible Tidal Disruption Event Candidate in the Black Hole Binary System of OJ 287

Abstract The BL Lacertae OJ 287 is a supermassive black hole binary system with complex physics of its irregular flares. During 2016 October–2017 April, surprising outburst in the X-ray, UV, and optical bands was detected, while no variability seen ? -ray light curve. outburst, X-ray curves were dominated by soft X-rays, whose peak luminosity ?10 46 erg s ?1 —more than 10 times higher mean level before outburst—and “softer-when-brighter” phenomenon exhibited. These above phenomena have been reported some previous works. hardness ratio showed negligible evolution flare time luminosity. Critically, X-rays decayed following power law t ?5/3 , which occurs most tidal disruption events (TDEs), similar trend can be UV during declining period. Helium oxygen narrow emission lines are strengthened prominently spectra postoutburst epochs, that could attributed to surrounding gas caused TDE. We discuss three possible origins event, including jet’s precession, aftereffects hole–disk impaction, Our results show TDE more likely scenario explain outburst.