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

We performed simple spot-model calculations for quasi-periodic brightnessvariations of solar-type stars showing superflares, by using Kepler photometricdata. Most of superflare stars show quasi-periodic brightness modulations withthe typical period of one to a few tens of days. Our results indicate thatthese brightness variations of superflare stars can be explained by therotation of the star with fairly large starspots. Using the result of theperiod analysis, we investigated the relation between the energy and frequencyof superflares and the rotation period. Stars with relatively slower rotationrates can still produce flares that are as energetic as those of more rapidlyrotating stars, although the average flare frequency is lower for more slowlyrotating stars. We found that the energy of superflares are related to thetotal coverage of starspots. The correlation between the spot coverage and theflare energy in superflares is similar to that in solar flares. These resultssuggest that the energy of superflares can be explained by the magnetic energystored around starspots.

astrophysical journal/the astrophysical journal

Superflares on Solar-Type Stars Observed with Kepler II. Photometric  Variability of Superflare-Generating Stars : A Signature of Stellar Rotation  and Starspots