The rotation–activity relation of M dwarfs: from K2 to TESS and PLATO

Stefanie Raetz, Beate Stelzer, Alexander Scholz

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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. Using 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 ∼10 days. Our sample, which is more than three times larger, increases the statistical significance of this finding.
Original languageEnglish
Pages (from-to)519-556
JournalAstronomische Nachrichten
Issue number5
Early online date25 Jun 2020
Publication statusPublished - 27 Aug 2020


  • Stars: late-type
  • Stars: activity
  • Stars: rotation
  • Stars: flare


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