Discovery of a Long-Duration Superflare on a Young Solar-Type Star EK Draconis with Nearly Similar Time Evolution for H$α$ and White-Light Emissions
Kosuke Namekata,
Hiroyuki Maehara,
Satoshi Honda
et al.
Abstract:Young solar-type stars are known to show frequent "superflares", which may severely influence the habitable worlds on young planets via intense radiations and coronal mass ejections. Here we report an optical spectroscopic and photometric observation of a long-duration superflare on the young solar-type star EK Draconis (50-120 Myr age) with the Seimei telescope and Transiting Exoplanet Survey Satellite (TESS ). The flare energy 2.6×10 34 erg and white-light flare duration 2.2 hr are much larger than those of … Show more
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