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arXiv · 2112.04808

Probable detection of an eruptive filament from a superflare on a solar-type star

Kosuke Namekata·Hiroyuki Maehara·Satoshi Honda·Yuta Notsu·Soshi Okamoto·Jun Takahashi·Masaki Takayama·Tomohito Ohshima·Tomoki Saito·Noriyuki Katoh·Miyako Tozuka·Katsuhiro L. Murata·Futa Ogawa·Masafumi Niwano·Ryo Adachi·Motoki Oeda·Kazuki Shiraishi·Keisuke Isogai·Daikichi Seki·Takako T. Ishii·Kiyoshi Ichimoto·Daisaku Nogami·Kazunari Shibata
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Abstract

Solar flares are often accompanied by filament/prominence eruptions ($\sim10^{4}$ K and $\sim 10^{10-11}$ cm$^{-3}$), sometimes leading to coronal mass ejections (CMEs) that directly affect the Earth's environment. `Superflares' are found on some active solar-type (G-type main-sequence) stars, but the association of filament eruptions/CMEs has not been established. Here we show that our optical spectroscopic observation of the young solar-type star EK Draconis reveals the evidence for a stellar filament eruption associated with a superflare. This superflare emitted a radiated energy of $2.0\times10^{33}$ erg, and blue-shifted hydrogen absorption component with a large velocity of $-510$ km s$^{-1}$ was observed shortly after. The temporal changes in the spectra greatly resemble those of solar filament eruptions. Comparing this eruption with solar filament eruptions in terms of the length scale and velocity strongly suggests that a stellar CME occurred. The erupted filament mass of $1.1\times10^{18}$ g is 10 times larger than those of the largest solar CMEs. The massive filament eruption and an associated CME provide the opportunity to evaluate how they affect the environment of young exoplanets/young Earth and stellar mass/angular-momentum evolution.

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Kosuke Namekata, Hiroyuki Maehara, Satoshi Honda, Yuta Notsu, Soshi Okamoto, Jun Takahashi, Masaki Takayama, Tomohito Ohshima, Tomoki Saito, Noriyuki Katoh, Miyako Tozuka, Katsuhiro L. Murata, Futa Ogawa, Masafumi Niwano, Ryo Adachi, Motoki Oeda, Kazuki Shiraishi, Keisuke Isogai, Daikichi Seki, Takako T. Ishii, Kiyoshi Ichimoto, Daisaku Nogami, Kazunari Shibata. 2021-12-09. Probable detection of an eruptive filament from a superflare on a solar-type star. https://doi.org/10.1038/s41550-021-01532-8

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