The rotation-activity relation of M dwarfs: From K2 to TESS and PLATO

Abstract

Studies of the rotation-activity relation of late-type stars are essential to enhance our understanding of stellar dynamos and angular momentum evolution. We study the rotation-activity relation with K2 for M dwarfs where it is especially poorly understood. We analyzed the light curves of all bright and nearby M dwarfs form the Superblink proper motion catalog that were in the K2 field of view. For a sample of 430 M dwarfs observed in campaigns C0-C19 in long cadence mode we determined the rotation period and a wealth of activity diagnostics. Our study of the rotation-activity relation based on photometric activity indicators confirmed the previously published abrupt change of the activity level at a rotation period of ~10d. Our more than three times larger sample increases the statistical significance of this finding.

arXiv commentAccepted for publication in Astronomical Notes (AN). 28 pages 11 figures, 4 tables. The tables are available in ascii format at http://straetz.stiller-berg.de/7.html

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Cited by in corpus (4)

• Stellar surface inhomogeneities as a potential source of the atmospheric signal detected in the K2-18 b transmission spectrum
• The most massive stars in very young star clusters with a limited mass: Evidence favours significant self-regulation in the star formation processes
• Long-term stellar activity of M dwarfs: A combined K2 and TESS study of two early M-type stars
• A systematic search for orbital periods of polars with TESS. Methods, detection limits, and results