A detection threshold in the amplitude spectra calculated from Kepler data obtained during K2 mission.
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Date
2015
Authors
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Publisher
Oxford University Press
Abstract
We present our analysis of simulated data in order to derive a detection threshold which can
be used in the pre-whitening process of amplitude spectra. In case of ground-based data of
pulsating stars, this threshold is conventionally taken to be four times the mean noise level in
an amplitude spectrum. This threshold is questionable when space-based data are analysed.
Our effort is aimed at revising this threshold in the case of continuous 90-d Kepler K2 phase
observations. Our result clearly shows that a 95 per cent confidence level, common for ground
observations, can be reached at 5.4 times the mean noise level and is coverage dependent.
In addition, this threshold varies between 4.8 and 5.7, if the number of cadences is changed.
This conclusion should secure further pre-whitening and helps to avoid over-interpretation of
spectra of pulsating stars observed with the Kepler spacecraft during K2 phase. We compare
our results with the standard approach widely used in the literature.
Description
Keywords
Astronomy, Stars, Simulated data, Spectra
Citation
Baran, A.C., et al. (2015). A detection threshold in the amplitude spectra calculated from Kepler data obtained during K2 mission. Monthly Notices of the Royal Astronomical Society, 448 (1): L16-L19.