A search for QPOs in the blazar OJ287: Preliminary results from the 2015/2016 observing campaign

Zola, S.
Valtonen, M.
Bhatta, G.
Goyal, A.
Debski, B.
Baran, A.
Krzesinski, J.
Siwak, M.
Ciprini, S.
Gopakumar, A.
Jermak, H.
Nilsson, K.
Reichart, D.
Matsumoto, K.
Sadakane, K.
Gazeas, K.
Kidger, M.
Piirola, V.
Alicavus, F.
Baliyan, K.S.
Berdyugin, A.
Boyd, D.
Campas Torrent, M.
Campos, F.
Carrillo Gómez, J.
Caton, D.B.
Chavushyan, V.
Dalessio, J.
Dimitrov, D.
Drozdz, M.
Er, H.
Erdem, A.
Escartin Pérez, A.
Fallah Ramazani, V.
Filippenko, A.V.
Garcia, F.
Gómez Pinilla, F.
Gopinathan, M.
Haislip, J.B.
Harmanen, J.
Hudec, R.
Hurst, G.
Ivarsen, K.M.
Jelinek, M.
Joshi, A.
Kagitani, M.
Kaur, N.
Keel, W.C.
LaCluyze, A.P.
Lee, B.C.
Lindfors, E.
Lozano de Haro, J.
Moore, J.P.
Mugrauer, M.
Naves Nogues, R.
Neely, A.W.
Nelson, R.H.
Ogloza, W.
Okano, S.
Pandey, J.C.
Perri, M.
Pihajoki, P.
Poyner, G.
Provencal, J.
Pursimo, T.
Raj, A.
Reinthal, R.
Sadegi, S.
Sakanoi, T.
Sameer
González, J.-L.S.
Schweyer, T.
Soldán Alfaro, F.C.
Karaman, N.
Sonbas, E.
Steele, I.
Stocke, J.T.
Strobl, J.
Takalo, L.O.
Tomov, T.
Tremosa Espasa, L.
Valdes, J.R.
Valero Pérez, J.
Verrecchia, F.
Webb, J.R.
Yoneda, M.
Zejmo, M.
Zheng, W.
Telting, J.
Saario, J.
Reynolds, T.
Kvammen, A.
Gafton, E.
Karjalainen, R.
Blay, P.

A search for QPOs in the blazar OJ287: Preliminary results from the 2015/2016 observing campaign

Authors: S. Zola Valtonen, M. Bhatta, G. Goyal, A. Debski, B. Baran, A. Krzesinski, J. Siwak, M. Ciprini, S. Gopakumar, A. Jermak, H. Nilsson, K. Reichart, D. Matsumoto, K. Sadakane, K. Gazeas, K. Kidger, M. Piirola, V. Alicavus, F. Baliyan, K.S. Berdyugin, A. Boyd, D. Campas Torrent, M. Campos, F. Carrillo Gómez, J. Caton, D.B. Chavushyan, V. Dalessio, J. Dimitrov, D. Drozdz, M. Er, H. Erdem, A. Escartin Pérez, A. Fallah Ramazani, V. Filippenko, A.V. Garcia, F. Gómez Pinilla, F. Gopinathan, M. Haislip, J.B. Harmanen, J. Hudec, R. Hurst, G. Ivarsen, K.M. Jelinek, M. Joshi, A. Kagitani, M. Kaur, N. Keel, W.C. LaCluyze, A.P. Lee, B.C. Lindfors, E. Lozano de Haro, J. Moore, J.P. Mugrauer, M. Naves Nogues, R. Neely, A.W. Nelson, R.H. Ogloza, W. Okano, S. Pandey, J.C. Perri, M. Pihajoki, P. Poyner, G. Provencal, J. Pursimo, T. Raj, A. Reinthal, R. Sadegi, S. Sakanoi, T. Sameer González, J.-L.S. Schweyer, T. Soldán Alfaro, F.C. Karaman, N. Sonbas, E. Steele, I. Stocke, J.T. Strobl, J. Takalo, L.O. Tomov, T. Tremosa Espasa, L. Valdes, J.R. Valero Pérez, J. Verrecchia, F. Webb, J.R. Yoneda, M. Zejmo, M. Zheng, W. Telting, J. Saario, J. Reynolds, T. Kvammen, A. Gafton, E. Karjalainen, R. Blay, P.
Publication date: 1 January 2016
Publisher

Abstract

We analyse the light curve in the R band of the blazar OJ287, gathered during the 2015/2016 observing season. We did a search for quasi-periodic oscillations (QPOs) using several methods over a wide range of timescales. No statistically significant periods were found in the high-frequency domain both in the ground-based data and in Kepler observations. In the longer-period domain, the Lomb-Scargle periodogram revealed several peaks above the 99% significance level. The longest one-about 95 days-corresponds to the innermost stable circular orbit (ISCO) period of the more massive black hole. The 43-day period could be an alias, or it can be attributed to accretion in the form of a two-armed spiral wave. © 2016 by the authors

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