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

S. Scaringi, P. J. Groot, M. Still

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

We present results from long-cadence Kepler observations covering 97.6 d of the newly discovered eclipsing cataclysmic variable KIS J192748.53+444724.5/KIC 8625249.We detect deep eclipses of the accretion disc by the donor star every 3.97 h. 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 with the hotspot is visible preceding the eclipse, and that this component is swamped by the brightness increase during the outburst, potentially associated with the accretion disc. Furthermore, we present evidence for accretion disc 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 suggests disc radius changes and/or radial temperature gradient variations in the disc.

Original languageEnglish
Article numberslt099
Pages (from-to)L68-L72
JournalMonthly Notices of the Royal Astronomical Society: Letters
Volume435
Issue number1
DOIs
StatePublished - Oct 2013

Keywords

  • Accretion, accretion discs
  • Binaries:Close
  • Stars:Individual:KIS J192748.53+444724.5
  • Stars:Individual:Kic 8625249

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