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Multiwavelength Campaign Observations of a Young Solar-type Star, EK Draconis. I. Discovery of Prominence Eruptions Associated with Superflares

  • Authors: Kosuke Namekata, Vladimir S. Airapetian, Pascal Petit, Hiroyuki Maehara, Kai Ikuta, Shun Inoue, Yuta Notsu, Rishi R. Paudel, Zaven Arzoumanian, Antoaneta A. Avramova-Boncheva, Keith Gendreau, Sandra V. Jeffers, Stephen Marsden, Julien Morin, Coralie Neiner, Aline A. Vidotto, Kazunari Shibata

Kosuke Namekata et al 2024 The Astrophysical Journal 961 .

  • Provider: AAS Journals

Caption: Figure 2.

Overall light curves of EK Dra for (a) Hα EW, (b) TESS's optical white light, and (c) NICER's X-ray count rate (0.5–3 keV), taken from 2022 April 9 to 2022 April 21. Hα EW is calculated within the wavelength range of 6562.8 ± 10 Å. Note that a negative (or negative-direction) EW value corresponds to emission by definition. TESS's optical white-light fluxes are normalized to the average flux. The vertical dashed lines represent detected superflares, labeled as “E1,” “E2,” and “E3.”

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