Quiescent photometric modulations of two low-inclination cataclysmic variables KZGem and TWVir

Abstract

The quiescent periodic photometric modulations of two low-inclination cataclysmic variables observed in Kepler K2 Campaigns 0 and 1, KZ Gem and TW Vir, are investigated. A phase-correcting method was successfully used to detect the orbital modulations of KZ Gem and TW Vir and improve their orbital periods. The light curve morphologies of both CVs were further analyzed by defining flux ratios and creating colormaps. KZ Gem shows ellipsoidal modulations with an orbital period of 0.22242(1) day, twice the period listed in the updated RK catalogue (Edition 7.24). With this newly determined period, KZ Gem is no longer a CV in the period gap, but a long-period CV. A part of the quiescent light curve of TW Vir that had the highest stability was used to deduce its improved orbital period of 0.182682(3) day. The flat patterns shown in the colormaps of the flux ratios for KZ Gem demonstrate the stability of their orbital modulations, while TW Vir show variable orbital modulations during the K2 datasets. In TW Vir, the single versus double-peaked nature of the quiescent orbital variations before and after superoutburst may be related to the effect of the superoutburst on the accretion disk.

arXiv comment10 pages, 12 figures, accepted by A&A

References in corpus (13)

• The K2 Mission: Characterization and Early results
• Catalogue of cataclysmic binaries, low-mass X-ray binaries and related objects (Seventh edition)
• A Technique for Extracting Highly Precise Photometry for the Two-Wheeled Kepler Mission
• A Catalog and Atlas of Cataclysmic Variables - The Living Edition
• K2 Variable Catalogue II: Machine Learning Classification of Variable Stars and Eclipsing Binaries in K2 Fields 0-4
• Superhumps in Cataclysmic Binaries. XXIV. Twenty More Dwarf Novae
• K2 Variable Catalogue: Variable Stars and Eclipsing Binaries in K2 Campaigns 1 and 0
• Survey of Period Variations of Superhumps in SU UMa-Type Dwarf Novae. IV: The Fourth Year (2011-2012)
• LS Peg: A Low-Inclination SW Sextantis-Type Cataclysmic Binary with High-Velocity Balmer Emission Line Wings
• Analysis of Three SU UMa-Type Dwarf Novae in the Kepler Field
• Cataclysmic Variables observed during K2 Campaigns 0 and 1
• On the orbital period of the cataclysmic variable RZ Leonis
• Kepler K2 Observations of the Intermediate Polar FO Aquarii

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• A Phenomenological Model for the Light Curve of three Quiescent Low-inclination Dwarf Novae and one Pre-Cataclysmic Variable
• Followup ground-based observations of the dwarf nova KZ Gem
• Photometric Analysis of the eclipsing Polar MN Hya
• Evolution of the Quiescent Disk surrounding a Superoutburst of the Dwarf Nova TW Virginis
• Full-frame data reduction method: a data mining tool to detect the potential variations in optical photometry