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This work brings a wavelet analysis for 14 Kepler white dwarf stars, in orderto confirm their photometric variability behavior and to search forperiodicities in these targets. From the observed Kepler light curves weobtained the wavelet local and global power spectra. Through this procedure,one can perform an analysis in time-frequency domain rich in details, and so toobtain a new perspective on the time evolution of the periodicities present inthese stars. We identified a photometric variability behavior in ten whitedwarfs, corresponding to period variations of ~ 2 h to 18 days: among thesestars, three are new candidates and seven, earlier identified from otherstudies, are confirmed.

A wavelet analysis of photometric variability in Kepler white dwarf stars