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, HE
- Nilsson, K
- Reichart, D
- Matsumoto, K
- Sadakane, K
- Gazeas, K
- Kidger, M
- Piirola, V
- Alicavus, F
- Baliyan, KS
- Berdyugin, A
- Boyd, D
- Campas Torrent, M
- Campos, F
- Carrillo Gómez, J
- Caton, DB
- Chavushyan, V
- Dalessio, J
- Dimitrov, D
- Drozdz, M
- Er, H
- Erdem, A
- Escartin Pérez, A
- Fallah Ramazani, V
- Filippenko, AV
- Garcia, F
- Gómez Pinilla, F
- Gopinathan, M
- Haislip, JB
- Harmanen, J
- Hudec, R
- Hurst, G
- Ivarsen, KM
- Jelinek, M
- Joshi, A
- Kagitani, M
- Kaur, N
- Keel, WC
- LaCluyze, AP
- Lee, BC
- Lindfors, E
- Lozano de Haro, J
- Moore, JP
- Mugrauer, M
- Naves Nogues, R
- Neely, AW
- Nelson, RH
- Ogloza, W
- Okano, S
- Pandey, JC
- Perri, M
- Pihajoki, P
- Poyner, G
- Provencal, J
- Pursimo, T
- Raj, A
- Reinthal, R
- Sadegi, S
- Sakanoi, T
- Sameer,
- González, JLS
- Schweyer, T
- Soldán Alfaro, FC
- Karaman, N
- Sonbas, E
- Steele, IA
- Stocke, JT
- Strobl, J
- Takalo, LO
- Tomov, T
- Tremosa Espasa, L
- Valdes, JR
- Valero Pérez, J
- Verrecchia, F
- Webb, JR
- Yoneda, M
- Zejmo, M
- Zheng, W
- Telting, J
- Saario, J
DOI Publisher
MDPI AGAbstract
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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