Double‐dipping to refine stellar rotation periods. Issue 5 (3rd August 2020)

• Record Type: Journal Article
• Authors: Tan, Joanne; Basri, Gibor
• Other Names: Barnes S.A. guestEditor.; Steffen M. guestEditor.; Strassmeier K.G. guestEditor.
• Is Part Of: Astronomische Nachrichten. Volume 341:Issue 5(2020)
• Page Start: 513
• Page End: 518
• Publication Date: 2020-08-03
• Subjects: stars: rotation – stars: activity – stars: magnetic fields, starspots – stars: statistics; Astronomy -- Periodicals; 520.5
• DOI: 10.1002/asna.202013728
• Languages: English
• ISSNs: 0004-6337

Abstract

Abstract: We present a refined analysis of 15, 038 Kepler main sequence light curves to determine the stellar rotation periods. The initial period estimates come from an autocorrelation function, as has been done before. We then measure the duration of every intensity dip in the light curve, expressed as fractions of the initial rotation period estimate. These dip duration distributions are subdivided into several regions whose relation to each other helps determine which harmonic of the initial rotation period is most physically plausible. We compare our final rotation periods to those from McQuillan et al. (2014) and find that the great majority agree, but about 10% of their periods are doubtful (usually twice as long as is most plausible). We are still refining our method, and will later extend it to more stars to substantially increase the sample of reliable stellar rotation periods.