Poster Open Access

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

Bogner, Mirjam; Stelzer, Beate; Raetz, Stefanie

I present an analysis of starspot modulation and flares in the TESS light curves of 112 M dwarfs with a TESS magnitude <=11.5 mag that are listed in the TESS Habitable Zone Star Catalog (HZCat, Kaltenegger et al. 2019). Understanding the magnetic activity of these potential exoplanet host stars is crucial for planet characterizations since an active, flaring host star might impact planetary habitability. Our sample is of particular interest as it comprises stars in the HZCat with sufficiently long TESS observation times for planets to be detected in the entire habitable zone. We detected more than 2000 optical flares in this sample and I discuss the relation of flares with spectral type and rotation period. I also present flare frequency distributions and the flux reaching the habitable zone during flare events.

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  • Stelzer, Beate et al. (2016). A path towards understanding the rotation-activity relation of M dwarfs with K2 mission, X-ray and UV data. MNRAS, 463, 1844

  • Raetz, Stefanie et al. (2020). Rotation-activity relations and flares of M dwarfs with K2 long- and short-cadence data. A&A, 637, A22

  • Hawley, Suzanne et al. (2014). Kepler Flares. I. Active and Inactive M Dwarfs. ApJ, 797, 121

  • Kaltenegger, L. et al. (2019). TESS Habitable Zone Star Catalog . ApJ, 874, L8

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