English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Stellar magnetic activity, just like that of the Sun, manifests itself in theform of flares and spots on the surface of the star. In the solar case, thelargest flares originate from large active regions. In this work, we present astudy of the activity of the star Kepler-411, including spot modeling fromplanetary transits. Our goal was to search for a connection between the area ofstarspots with the energy of superflares produced by this star. Kepler-411 is aK2V-type star with an average rotation period of 10.52 days, radius of 0.79$R_{\odot}$ and a mass of 0.83 $M_{\odot} $, which was observed by the Keplersatellite for about 600 days. Transit mapping allowed for the characterizationof 198 starspots with estimates of their radius and temperature. Kepler-411starspots had an average radius of $(17 \pm 7)\times 10^3$ km and a meantemperature of $3800 \pm 700$ K. Visual inspection of the light curves ofKepler-411 yields the identification of 65 superflares. The detectedsuperflares lasted from 8 to 260 min and their energy varied from $10^{33} -10^{35}$ ergs. The power-law index of the flare frequency distribution as afunction of energy is (-2.04 $\pm$ 0.13) for the flare on Kepler-411. Apositive correlation between the area of starspots and the energy ofsuperflares was found when considering the averages taken every 16 to 35 days,with the highest correlation occurring for averages every 21 days. This timingis probably related to the lifetime of the Kepler-411 spots.

Kepler-411 star activity: connection between starspots and superflares