Yuta Notsu Adam F. Kowalski Hiroyuki Maehara Kosuke Namekata Kenji Hamaguchi Teruaki Enoto Isaiah I. Tristan Suzanne L. Hawley James R. A. Davenport Satoshi Honda Kai Ikuta Shun Inoue Keiichi Namizaki Daisaku Nogami Kazunari Shibata
The Astrophysical Journal 961(2) 189-189 2024年1月
Abstract
We conducted the time-resolved simultaneous optical spectroscopic and photometric observations of mid-M-dwarf flare stars YZ CMi, EV Lac, and AD Leo. Spectroscopic observations were obtained using Apache Point Observatory 3.5 m and Smal...
Kai Ikuta Kosuke Namekata Yuta Notsu Hiroyuki Maehara Soshi Okamoto Satoshi Honda Daisaku Nogami Kazunari Shibata
The Astrophysical Journal 948(1) 64-64 2023年5月 [査読有り]
Abstract
Starspots and stellar flares are indicators of stellar magnetic activity. The magnetic energy stored around spots is thought to be the origin of flares, but the connection is not completely understood. To investigate the relation betwee...
The Astrophysical Journal 948(1) 9-9 2023年4月 [査読有り]
Abstract
Stellar coronal mass ejections (CMEs) have recently received much attention for their impacts on exoplanets and stellar evolution. Detecting prominence eruptions, the initial phase of CMEs, as the blueshifted excess component of Balmer ...
The Astrophysical Journal 945(1) 61-61 2023年3月 [査読有り]
<jats:title>Abstract</jats:title>
<jats:p>Active M-type stars are known to often produce superflares on the surface. Radiation from stellar (super)flares is important for exoplanet habitability, but the mechanisms are not well understood. In this...
Haining Li Wako Aoki Tadafumi Matsuno Qianfan Xing Takuma Suda Nozomu Tominaga Yuqin Chen Satoshi Honda Miho N. Ishigaki Jianrong Shi Jingkun Zhao Gang Zhao
The Astrophysical Journal 931(2) 147-147 2022年6月 [査読有り]
Abstract
We present homogeneous abundance analysis of over 20 elements for 385 very metal-poor (VMP) stars based on the LAMOST survey and follow-up observations with the Subaru Telescope. It is the largest high-resolution VMP sample (including 3...
Yuta Notsu Adam F. Kowalski Hiroyuki Maehara Kosuke Namekata Satoshi Honda Teruaki Enoto Kenji Hamaguchi Isaiah Tristan Suzanne L. Hawley James R. A. Davenport Soshi Okamoto Kai Ikuta Daisaku Nogami Kazunari Shibata
2021年7月
Flares are releases of magnetic energy in the stellar atmosphere, and they have strong emissions from radio to X-rays. During some M dwarf flares, chromospheric line profiles show blue asymmetries, although red asymmetries are more commonly observ...
Solar and stellar flares are caused by the sudden release of magnetic energy on the surfaces. In the case of the Sun, mass ejections often accompany solar flares and affect the Earth’s environment. Active solar-type stars (G-type main-sequence sta...
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自然・環境科学研究所