# A wavelet analysis of photometric variability in Kepler white dwarf stars

## TL;DR

This study applies wavelet analysis to Kepler white dwarf stars to confirm and explore their photometric variability and periodicities, providing detailed time-frequency insights into their behavior.

## Contribution

It introduces a wavelet-based method to analyze variability in white dwarf stars, confirming known and identifying new candidates with periodicities.

## Key findings

- Photometric variability identified in 10 white dwarfs
- Period variations range from ~2 hours to 18 days
- 3 new variability candidates confirmed, 7 previously known

## Abstract

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