Long-term Periodicities of Cataclysmic Variables with Synoptic Surveys
arXiv:1706.06731 · doi:10.1088/1538-3873/aa7a99
Abstract
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.
33 pages, 9 figures (manuscript form), Accepted for publication in PASP
References in corpus (10)
- The generalised Lomb-Scargle periodogram. A new formalism for the floating-mean and Keplerian periodograms
- Magnetic Cycles and Rotation Periods of Late Type Stars from photometric time series
- Cataclysmic Variables from the Catalina Real-time Transient Survey
- The IPAC Image Subtraction and Discovery Pipeline for the intermediate Palomar Transient Factory
- Spectroscopy of Nine Cataclysmic Variable Stars
- Cyclical period changes in HT Cas: a clear difference between systems above and below the period gap
- Detection of superhumps in the VY Scl-type nova-like variable KR Aur
- RR Pictoris: an old nova showing superhumps and QPOs
- Predictions for Triple Stars with and without a Pulsar in Star Clusters
- NSV 1907 - A new eclipsing, nova-like cataclysmic variable