تقرير
Probable detection of an eruptive filament from a superflare on a solar-type star
| العنوان: | Probable detection of an eruptive filament from a superflare on a solar-type star |
|---|---|
| المؤلفون: | Namekata, Kosuke, Maehara, Hiroyuki, Honda, Satoshi, Notsu, Yuta, Okamoto, Soshi, Takahashi, Jun, Takayama, Masaki, Ohshima, Tomohito, Saito, Tomoki, Katoh, Noriyuki, Tozuka, Miyako, Murata, Katsuhiro L., Ogawa, Futa, Niwano, Masafumi, Adachi, Ryo, Oeda, Motoki, Shiraishi, Kazuki, Isogai, Keisuke, Seki, Daikichi, Ishii, Takako T., Ichimoto, Kiyoshi, Nogami, Daisaku, Shibata, Kazunari |
| سنة النشر: | 2021 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - Solar and Stellar Astrophysics, Astrophysics - Earth and Planetary Astrophysics |
| الوصف: | 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. Comment: 40 pages, 4 figures, 4 extended data figures, published in Nature Astronomy (2021) |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1038/s41550-021-01532-8 |
| الوصول الحر: | http://arxiv.org/abs/2112.04808Test |
| رقم الانضمام: | edsarx.2112.04808 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1038/s41550-021-01532-8 |
|---|