Published February 25, 2021 | Version v1
Poster Open

Rotation and flares of M dwarfs with habitable zones accessible to TESS

  • 1. Institut für Astronomie und Astrophysik Tübingen
  • 2. Institut für Astronomie und Astrophysik Tübingen, INAF - Osservatorio Astronomico di Palermo




We present an analysis of starspot modulation and flares in the TESS lightcurves of 112 M dwarfs with a TESS magnitude \(\leq 11.5\) that are listed in the TESS Habitable Zone Star Catalog (HZCat, Kaltenegger et al. 2019). Our sample is of particular interest since it comprises stars in the HZCat with sufficiently long TESS observation times for planets to be detected in the entire habitable zone. Understanding the magnetic activity of such stars is crucial for exoplanet characterization since an active, flaring host star might influence the planet’s habitability.

We detected more than 2000 flares in this sample and we discuss the relation of flares with spectral type and rotation period. We also present flare frequency distributions (FFDs) and the flux reaching the habitable zone during flare events.



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Additional details


  • Stelzer, Beate et al. (2016). A path towards understanding the rotation-activity relation of M dwarfs with K2 mission, X-ray and UV data.
  • Raetz, Stefanie et al. (2020). Rotation-activity relations and flares of M dwarfs with K2 long- and short-cadence data.
  • Hawley, Suzanne et al. (2014). Kepler Flares. I. Active and Inactive M Dwarfs.
  • Kaltenegger, L. et al. (2019). TESS Habitable Zone Star Catalog .