@article{3069155,
    title = "Authenticating the Presence of a Relativistic Massive Black Hole Binary in OJ 287 Using Its General Relativity Centenary Flare: Improved Orbital Parameters",
    author = "Dey, L. and Valtonen, M.J. and Gopakumar, A. and Zola, S. and Hudec, R. and Pihajoki, P. and Ciprini, S. and Matsumoto, K. and Sadakane, K. and Kidger, M. and Nilsson, K. and Mikkola, S. and Sillanpää, A. and Takalo, L.O. and Lehto, H.J. and Berdyugin, A. and Piirola, V. and Jermak, H. and Baliyan, K.S. and Pursimo, T. and Caton, D.B. and Alicavus, F. and Baransky, A. and Blay, P. and Boumis, P. and Boyd, D. and Torrent, M.C. and Campos, F. and Gómez, J.C. and Chandra, S. and Chavushyan, V. and Dalessio, J. and Debski, B. and Drozdz, M. and Er, H. and Erdem, A. and Pérez, A.E. and Ramazani, V.F. and Filippenko, A.V. and Gafton, E. and Ganesh, S. and Garcia, F. and Gazeas, K. and Godunova, V. and Pinilla, F.G. and Gopinathan, M. and Haislip, J.B. and Harmanen, J. and Hurst, G. and Janík, J. and Jelinek, M. and Joshi, A. and Kagitani, M. and Karjalainen, R. and Kaur, N. and Keel, W.C. and Kouprianov, V.V. and Kundera, T. and Kurowski, S. and Kvammen, A. and Lacluyze, A.P. and Lee, B.C. and Liakos, A. and Lindfors, E. and De Haro, J.L. and Mugrauer, M. and Nogues, R.N. and Neely, A.W. and Nelson, R.H. and Ogloza, W. and Okano, S. and Pajdosz-Śmierciak, U. and Pandey, J.C. and Perri, M. and Poyner, G. and Provencal, J. and Raj, A. and Reichart, D.E. and Reinthal, R. and Reynolds, T. and Saario, J. and Sadegi, S. and Sakanoi, T. and González, J.-L.S. and Sameer and Schweyer, T. and Simon, A. and Siwak, M. and Alfaro, F.C.S. and Sonbas, E. and Steele, I. and Stocke, J.T. and Strobl, J. and Tomov, T. and Espasa, L.T. and Valdes, J.R. and Pérez, J.V. and Verrecchia, F. and Vasylenko, V. and Webb, J.R. and Yoneda, M. and Zejmo, M. and Zheng, W. and Zielinski, P.",
    journal = "ASTROPHYSICAL JOURNAL",
    year = "2018",
    volume = "866",
    number = "1",
    publisher = "INSTITUTE OF PHYSICS PUBLISHING",
    issn = "0004-637X",
    doi = "10.3847/1538-4357/aadd95",
    abstract = "Results from regular monitoring of relativistic compact binaries like PSR 1913+16 are consistent with the dominant (quadrupole) order emission of gravitational waves (GWs). We show that observations associated with the binary black hole (BBH) central engine of blazar OJ 287 demand the inclusion of gravitational radiation reaction effects beyond the quadrupolar order. It turns out that even the effects of certain hereditary contributions to GW emission are required to predict impact flare timings of OJ 287. We develop an approach that incorporates this effect into the BBH model for OJ 287. This allows us to demonstrate an excellent agreement between the observed impact flare timings and those predicted from ten orbital cycles of the BBH central engine model. The deduced rate of orbital period decay is nine orders of magnitude higher than the observed rate in PSR 1913+16, demonstrating again the relativistic nature of OJ 287's central engine. Finally, we argue that precise timing of the predicted 2019 impact flare should allow a test of the celebrated black hole "no-hair theorem" at the 10% level. © 2018. The American Astronomical Society. All rights reserved."
}