Published February 25, 2021 | Version v1
Poster Open

From Starspots to Stellar Coronal Mass Ejections—Revisiting Empirical Stellar Relations

  • 1. Institut für Experimentelle und Angewandte Physik, Christan-Albrechts-Universität zu Kiel, Leibnizstr. 11, D-24118 Kiel, Germany
  • 2. Institute for Astronomy, Astrophysics, Space Applications and Remote Sensing (IAASARS), National Observatory of Athens, I. Metaxa & Vas. Pavlou St., 15236 Penteli, Greece
  • 3. NASA Goddard Space Flight Center, 8800 Greenbelt Rd, Greenbelt, MD 20771, USA
  • 4. Center for Space Science, New York University Abu Dhabi, P.O. Box 129188, Abu Dhabi, UAE




Upcoming missions, including the James Webb Space Telescope, will soon characterize the atmospheres of terrestrial-type exoplanets in habitable zones around cool K- and M-type stars by searching for atmospheric biosignatures. Recent observations suggest that the ionizing radiation and particle environment from active cool planet hosts may be detrimental to exoplanetary habitability. Since no direct information on the radiation field is available, empirical relations between signatures of stellar activity, including the sizes and magnetic fields of starspots, are often used. Here, we revisit the empirical relation between the starspot size and the effective stellar temperature and evaluate its impact on estimates of stellar flare energies, coronal mass ejections, and fluxes of the associated stellar energetic particle events.



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Journal article: 10.3847/1538-4357/abcc04 (DOI)