@article {28410,
	title = {Detection of Possible Quasi-periodic Oscillations in the Long-term Optical Light Curve of the BL Lac Object OJ 287},
	volume = {832},
	year = {2016},
	month = {2016/11/1},
	pages = {47},
	abstract = {The detection of periodicity in the broadband non-thermal emission of blazars has so far been proven to be elusive. However, there are a number of scenarios that could lead to quasi-periodic variations in blazar light curves. For example, an orbital or thermal/viscous period of accreting matter around central supermassive black holes could, in principle, be imprinted in the multi-wavelength emission of small-scale blazar jets, carrying such crucial information about plasma conditions within the jet launching regions. In this paper, we present the results of our time series analysis of the \~{}9.2 yr long, and exceptionally well-sampled, optical light curve of the BL Lac object OJ 287. The study primarily used the data from our own observations performed at the Mt. Suhora and Krak{\'o}w Observatories in Poland, and at the Athens Observatory in Greece. Additionally, SMARTS observations were used to fill some of the gaps in the data. The Lomb-Scargle periodogram and the weighted wavelet Z-transform methods were employed to search for possible quasi-periodic oscillations in the resulting optical light curve of the source. Both methods consistently yielded a possible quasi-periodic signal around the periods of \~{}400 and \~{}800 days, the former with a significance (over the underlying colored noise) of >=slant 99 \% . A number of likely explanations for this are discussed, with preference given to a modulation of the jet production efficiency by highly magnetized accretion disks. This supports previous findings and the interpretation reported recently in the literature for OJ 287 and other blazar sources.},
	keywords = {Accretion, Accretion Disks, Astrophysics - High Energy Astrophysical Phenomena, BL Lacertae objects: individual: OJ 287, galaxies: active, galaxies: jets, radiation mechanisms: non-thermal},
	isbn = {0004-637X},
	url = {https://ui.adsabs.harvard.edu/abs/2016ApJ...832...47B},
	author = {Bhatta, G. and Zola, S. and Stawarz, {\L}. and Ostrowski, M. and Winiarski, M. and Og{\l}oza, W. and Dr{\'o}{\.z}d{\.z}, M. and Siwak, M. and Liakos, A. and Kozie{\l}-Wierzbowska, D. and Gazeas, K. and Debski, B. and Kundera, T. and Stachowski, G. and Paliya, V. S.}
}
