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Published September 2017 | Submitted
Journal Article Open

Long-term Periodicities of Cataclysmic Variables with Synoptic Surveys


A systematic study on the long-term periodicities of known Galactic cataclysmic variables (CVs) was conducted. Among 1580 known CVs, 344 sources were matched and extracted from the Palomar Transient Factory (PTF) data repository. The PTF light curves were combined with the Catalina Real-Time Transient Survey (CRTS) light curves and analyzed. Ten targets were found to exhibit long-term periodic variability, which is not frequently observed in the CV systems. These long-term variations are possibly caused by various mechanisms, such as the precession of the accretion disk, hierarchical triple star system, magnetic field change of the companion star, and other possible mechanisms. We discuss the possible mechanisms in this study. If the long-term period is less than several tens of days, the disk precession period scenario is favored. However, the hierarchical triple star system or the variations in magnetic field strengths are most likely the predominant mechanisms for longer periods.

Additional Information

© 2017 The Astronomical Society of the Pacific. Received 2017 May 21; accepted 2017 June 20; published 2017 July 20. M.T.-C.Y. is grateful to have the anonymous referee for the precious comments and suggestions. M.T.-C.Y. thanks the Ministry of Science and Technology (MOST) of Taiwan for support through the grant MOST 104-2119-M-008-024 (TANGO Project, as the courtesy of W.H.Ip.), NSC 102-2112-M-008-020-MY3, and MOST 105-2112-M-008-012. PTF is a collaboration project in science among the California Institute of Technology, Los Alamos National Laboratory, the University of Wisconsin-Milwaukee, the Oskar Klein Center, the Weizmann Institute of Science, the TANGO Program of the University System of Taiwan, and the Kavli Institute for the Physics and Mathematics of the Universe. C.R.T.S. was supported by the NSF grants of AST-1313422, AST-1413600, and AST-1518308.

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August 19, 2023
October 26, 2023