Kepler observations of the eclipsing cataclysmic variable KIS J192748.53+444724.5

Abstract

We present results from long cadence Kepler observations covering 97.6 days of the newly discovered eclipsing cataclysmic variable KIS J192748.53+444724.5/KIC 8625249. We detect deep eclipses of the accretion disk by the donor star every 3.97 hours. Additionally, the Kepler observations also cover a full outburst for this cataclysmic variable, making KIS J192748.53+444724.5 the second known eclipsing cataclysmic variable system in the Kepler field of view. We show how in quiescence a significant component associated to the hot-spot is visible preceding the eclipse, and that this component is swamped by the brightness increase during the outburst, potentially associated with the accretion disk. Furthermore we present evidence for accretion disk radius changes during the outburst by analysing the out-of-eclipse light levels and eclipse depth through each orbital cycle. We show how these parameters are linearly correlated in quiescence, and discuss how their evolution during the outburst is suggesting disk radius changes and/or radial temperature gradient variations in the disk.

5 pages, 5 figures. Accepted for publication in MNRAS Letters

References in corpus (14)

• Kepler Mission Design, Realized Photometric Performance, and Early Science
• The Evolution of Cataclysmic Variables as Revealed by their Donor Stars
• Kepler Science Operations
• Initial data release of the Kepler-INT Survey
• The Universal Nature of Accretion-induced Variability: The RMS-Flux Relation in an Accreting White Dwarf
• V344 Lyrae: A Touchstone SU UMa Cataclysmic Variable in the Kepler Field
• The Cause of the Superoutburst in SU UMa Stars is Finally Revealed by Kepler Light Curve of V1504 Cygni
• The Kepler light curves of V1504 Cygni and V344 Lyrae: A study of the Outburst Properties
• The Kepler Light Curve of V344 Lyrae: Constraining the Thermal-Viscous Limit Cycle Instability
• Broad-band timing properties of the accreting white dwarf MV Lyrae
• Quiescent Superhumps Detected in the Dwarf Nova V344 Lyrae by Kepler
• Serendipitous Kepler observations of a background dwarf nova of SU UMa type
• Kepler Observations of V447 Lyr: An Eclipsing U Gem Cataclysmic Variable
• Spectroscopic identifications of blue H-alpha excess sources in the Kepler field-of-view

Cited by in corpus (12)

• The evolutionary status of Cataclysmic Variables: Eclipse modelling of 15 systems
• A Catalogue of Potential Post Common Envelope Binaries
• Cataclysmic Variables observed during K2 Campaigns 0 and 1
• The Eclipsing Accreting White Dwarf Z Chameleontis as Seen with TESS
• New evidence for the precession of tilted disk in SDSS J081256.85+191157.8
• EX Draconis: Using Eclipses to Separate Outside-In and Inside-Out Outbursts
• A parameter study of the eclipsing CV in the Kepler field, KIS J192748.53+444724.5
• V729 Sgr: A long period dwarf nova showing negative superhumps during quiescence
• BOKS 45906: a CV with an orbital period of 56.6 min in the Kepler field?
• fBLS -- a fast-folding BLS algorithm
• The {\it K2} Light Curves and Stunted Outbursts of AC Cnc
• Optimizing Photometric Light Curve Analysis: Evaluating Scipy's Minimize Function for Eclipse Mapping of Cataclysmic Variables