Cataclysmic Variables observed during K2 Campaigns 0 and 1

Abstract

There are 15 cataclysmic variables (CVs) observed in the first two campaigns of the K2 mission. In this paper, the eight CVs showing distinct features are analyzed in detail. Among these eight, modulations during quiescence are evident at the known orbital periods in the SU UMa stars QZ Vir and RZ Leo, and at our newly determined orbital periods of 1RXS J0632+2536 and WD 1144+011. The periodogram analysis for the quiescent light curve of QZ Vir reveals multi-period modulations and the coexistence of orbital and superhump periods. The phased orbital light curves for the other 3 CVs in quiescence display wide (about half cycle) and shallow (< 0.5 mag) eclipse features. Besides these modulations, their quiescent light curves reveal several transient events: a sudden decrease of system light in 1RXS J0632+2536, a low level flare-like event in QZ Vir, a short brightening event in RZ Leo and a temporary disappearance of the orbital modulation in WD 1144+011. The two known dwarf novae UV Gem and TW Vir and the CVs USNO-B1.01144-00115322 and CSS130516:111236.7+002807 show outbursts, including 1 complete and 3 incomplete normal outbursts and 2 complete superoutbursts. An incomplete but typical normal outburst confirms the dwarf nova identification of the USNO-B1.01144-00115322. The one complete normal outburst in UV Gem possibly provides the orbital period, since its modulations are shorter than the previously observed superhump period. The superoutbursts of TW Vir and CSS130516:111236.7+002807, along with their corresponding superhump periods, indicate that both objects are SU UMa stars. The derived superhump period of CSS130516:111236.7+002807 is 1.44 hr, implying that this new SU UMa star is close to the period minimum.

arXiv comment38 pages, 14 figures, accepted by AJ

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• Hubble Space Telescope Ultraviolet Light Curves Reveal Interesting Properties of CC Sculptoris and RZ Leonis
• V729 Sgr: A long period dwarf nova showing negative superhumps during quiescence
• K2 study of the Magnetic Precataclysmic Variable V1082 Sagittarius
• AT 2020iko: a WZ Sge-type DN candidate with an anomalous precursor event
• A Phenomenological Model for the Light Curve of three Quiescent Low-inclination Dwarf Novae and one Pre-Cataclysmic Variable
• The Vast Potential of Exoplanet Satellites for High-Energy Astrophysics
• 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
• LAMOST J2043+3413 -- a Fast Disk Precession SW Sextans Candidate in Period Gap
• Full-frame data reduction method: a data mining tool to detect the potential variations in optical photometry