MULTI-PERIODIC OSCILLATORY EVENT IN A STELLAR SUPERFLARE: SPECTRAL ANALYSIS AND INTERPRETATION

Abstract

We report the detection of multiple quasi-periodic pulsations (QPPs) observed during the flaring activity of a young, active solar-type star observed by NASA's Kepler Mission. The QQP signal was analyzed with a data-driven non-parametric method, Singular Spectrum Analysis (SSA), which has never been utilized previously for analyzing solar or stellar QPPs in flares. The present analysis reveals that the apparent anharmonic shape of the QPPs in this super flare results from a superposition of two intrinsic modes whose amplitude and time modulation are suggestive of specific physical processes that are also found in operation during solar flares.