The 21st Cambridge workshop on Cool Stars, Stellar Systems, and the Sun
Published December 6, 2022 | Version v1
Presentation Open

Constraining stellar CME occurrence from optical spectra

Authors/Creators

  • 1. Institute of Physics/IGAM, University of Graz, Austria
  • 2. Astronomical Institute, Czech Academy of Sciences, Ondřejov, Czech Republic, and University of Wrocław, Center of Scientific Excellence – Solar and Stellar Activity, Wrocław, Poland

Description

Optical spectroscopic observations sometimes show asymmetrically broadened wings and/or transient extra-emissions in chromospheric lines. Such events appear most commonly on active M dwarfs. These signatures could be due to prominence eruptions, which are closely related to CMEs on the Sun. We estimate the expected signatures of prominence eruptions in the Balmer lines using a simple radiative transfer model, thereby constraining the parameter ranges of observable events. In contrast to our previous study, we include the contribution of thermal emission in addition to scattering and find that this improves the observability of prominence eruptions on M dwarfs compared to a Sun-like star.

Notes

Acknowledgments: Austrian Science Fund (FWF): P30949-N36, I 5711-N; Czech Science Foundation 19-17102S, 22-34841S; 'Excellence Initiative - Research University' 2020-2026 at University of Wrocław project No. BPIDUB.4610.96.2021.KG.

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Additional details

Funding

FWF Austrian Science Fund
Superflares: Their origins and connection with planets I 5711
FWF Austrian Science Fund
CME activity of the Sun in different evolutionary stages P 30949

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