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We present our analysis of simulated data in order to derive a detectionthreshold which can be used in the pre-whitening process of amplitude spectra.In case of ground-based data of pulsating stars, this threshold isconventionally taken to be four times the mean noise level in an amplitudespectrum. This threshold is questionable when space-based data are analyzed.Our effort is aimed at revising this threshold in the case of continuous 90-dayKepler K2 phase observations. Our result clearly shows that a 95% confidencelevel, common for ground observations, can be reached at 5.4 times the meannoise level and is coverage dependent. In addition, this threshold variesbetween 4.8 and 5.7, if the number of cadences is changed. This conclusionshould secure further pre-whitening and helps to avoid over-interpretation ofspectra of pulsating stars observed with the Kepler spacecraft during K2 phase.We compare our results with the standard approach widely used in theliterature.

A detection threshold in the amplitude spectra calculated from Kepler data obtained during K2 mission