Journal Article

An examination of some characteristics of <i>Kepler</i> short- and long-cadence data

Simon J. Murphy

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 422, issue 1, pages 665-671
Published in print May 2012 | ISSN: 0035-8711
Published online April 2012 | e-ISSN: 1365-2966 | DOI:
An examination of some characteristics of Kepler short- and long-cadence data

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A close comparison of Kepler short- and long-cadence data released prior to 2011 November 1 has shown some subtle differences that make the short-cadence data superior to their long-cadence counterparts. The inevitable results of a faster sampling rate are present: the short-cadence data provide greater time resolution for short-lived events like flares, and have a much higher Nyquist frequency than the long-cadence data; however, they also contain fewer high-amplitude peaks at low frequency and allow a more precise determination of pulsation frequencies, amplitudes and phases. The latter observation indicates that Kepler data are not normally distributed. Moreover, a close inspection of the Pre-search Data Conditioned long-cadence data shows residuals that have increased noise on time-scales important to asteroseismology, but unimportant to planet searches.

Keywords: asteroseismology; methods: data analysis; methods: observational; techniques: photometric; stars: activity; stars: oscillations

Journal Article.  4807 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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