A1 Refereed original research article in a scientific journal
Detection of an Optical Quasiperiodic Oscillation in the Blazar 3C 454.3; 
Authors: Dogra, Karan; Gupta, Alok C.; Raiteri, C. M.; Villata, M.; Wiita, Paul J.; Valtonen, Mauri J.; Kurtanidze, S. O.; Jorstad, S. G.; Bachev, R.; Damljanovic, G.; Lorey, C.; Savchenko, S. S.; Vince, O.; Abdelkareem, M.; Aceituno, F. J.; Acosta-Pulido, J. A.; Agudo, I.; Andreuzzi, G.; Ata, S. A.; Baida, G. V.; Barbieri, L.; Blinov, D. A.; Bonnoli, G.; Borman, G. A.; Carnerero, M. I.; Carosati, D.; Casanova, V.; Chen, W. P.; Cui, Lang; Devanand, P. U.; Elhosseiny, E. G.; Elsaesser, D.; Escudero, J.; Fan, J. H.; Feige, M.; Gazeas, K.; Grishina, T. S.; Gu, Minfeng; Hagen-Thorn, V. A.; Hemrich, F.; Hsiao, H. Y.; Ismail, M.; Ivanidze, R. Z.; Jovanovic, M. D.; Kamel, T. M.; Kimeridze, G. N.; Kishore, Shubham; Kopatskaya, E. N.; Kuberek, D.; Kurtanidze, O. M.; Kurtenkov, A.; Larionov, V. M.; Larionova, Elena G.; Larionova, L. V.; Lin, H. C.; Marchini, A.; Marinelli, C.; Marscher, A. P.; Morcuende, D.; Morozova, D. A.; Nazarov, S. V.; Nikolashvili, M. G.; Reinhart, D.; Otero-Santos, J.; Scherbantin, A.; Semkov, E.; Shishkina, E. V.; Sigua, L. A.; Singh, A. K.; Sota, A.; Steineke, R.; Stojanovic, M.; Strigachev, A.; Takey, A.; Tawfeek, Amira A.; Tripathi, Tushar; Troitskiy, I. S.; Troitskaya, Y. V.; Tsai, An-Li; Vasilyev, A. A.; Vrontaki, K.; Zhang, Zhongli; Zhovtan, A. V.; Zottmann, N.; Zuo, Wenwen
Publisher: Institute of Physics Publishing
Publication year: 2026
Journal: Astrophysical Journal
Article number: 204
Volume: 1003
Issue: 2
ISSN: 0004-637X
eISSN: 1538-4357
DOI: https://doi.org/10.3847/1538-4357/ae67fb
Publication's open availability at the time of reporting: Open Access
Publication channel's open availability : Open Access publication channel
Web address : https://iopscience.iop.org/article/10.3847/1538-4357/ae67fb
Self-archived copy’s web address: https://research.utu.fi/converis/portal/detail/Publication/526556155
Self-archived copy's licence: CC BY
Self-archived copy's version: Publisher`s PDF
We analyzed 19 yr of R-band data of the blazar 3C 454.3 from the Whole Earth Blazar Telescope archive, along with new data from its members and from public archives such as those provided by the Small and Moderate Aperture Research Telescope System and the Steward Observatory projects to search for quasiperiodic oscillations (QPOs). We detected a QPO of ∼433 days using Lomb–Scargle periodogram, which lasted from MJD 54980–58450 as detected by the weighted wavelet Z-transform technique, making it one of the most persistent QPOs ever detected in the optical regime. The phase dispersion minimization technique was also performed to further validate this QPO claim. We detected this signal at a global significance of 2.53σ across all methodologies. To explain the observed QPO, we have considered both models focused on the accretion disk around a supermassive black hole (SMBH), and those based purely on jet emissions. Plausible jet-based models involve a shock moving down the jet in a helical magnetic field, whereas the SMBH models could involve Lense–Thirring-effect-induced jet precession or dual jets in a binary SMBH system. We introduce a novel approach to distinguish genuine QPOs from spurious signals arising from annual seasonal gaps, a common limitation of ground-based observations.
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https://iopscience.iop.org/article/10.3847/1538-4357/ae67fb#Acknowledgments
