Zobrazeno 1 - 10
of 43
pro vyhledávání: '"OEDA, Motoki"'
Autor:
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, Nogami, Daisaku, Shibata, Kazunari
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
Externí odkaz:
http://arxiv.org/abs/2201.09416
Autor:
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
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 act
Externí odkaz:
http://arxiv.org/abs/2112.04808
Autor:
Maehara, Hiroyuki, Notsu, Yuta, Namekata, Kousuke, Honda, Satoshi, Kowalski, Adam F., Katoh, Noriyuki, Ohshima, Tomohito, Iida, Kota, Oeda, Motoki, Murata, Katsuhiro L., Yamanaka, Masayuki, Takagi, Kengo, Sasada, Mahito, Akitaya, Hiroshi, Ikuta, Kai, Okamoto, Soshi, Nogami, Daisaku, Shibata, Kazunari
In this paper, we present the results from spectroscopic and photometric observations of the M-type flare star YZ CMi in the framework of the Optical and Infrared Synergetic Telescopes for Education and Research (OISTER) collaborations during the Tra
Externí odkaz:
http://arxiv.org/abs/2009.14412
Autor:
Kimura, Mariko, Isogai, Keisuke, Kato, Taichi, Kojiguchi, Naoto, Wakamatsu, Yasuyuki, Ohnishi, Ryuhei, Sugiura, Yuki, Matsumoto, Hanami, Sumiya, Sho, Ito, Daiki, Nikai, Kengo, Matsumoto, Katsura, Shugarov, Sergey Yu., Kathysheva, Natalia, Itoh, Hiroshi, Dubovsky, Pavol A., Kudzej, Igor, Akitaya, Hiroshi, Oide, Kohei, Kanai, Takahiro, Ishioka, Chihiro, Oasa, Yumiko, Vanmunster, Tonny, Oksanen, Arto, Tordai, Tamás, Murata, Katsuhiro L., Shiraishi, Kazuki, Adachi, Ryo, Oeda, Motoki, Tachibana, Yutaro, Kiyota, Seiichiro, Pavlenko, Elena P., Antonyuk, Kirill, Antonyuk, Oksana, Pit, Nikolai, Sosnovskij, Aleksei, Babina, Julia, Baklanov, Alex, Kawabata, Koji S., Kawabata, Miho, Nakaoka, Tatsuya, Yamanaka, Masayuki, Kasai, Kiyoshi, Miller, Ian, Brincat, Stephen M., Liu, Wei, Sasada, Mahito, Nogami, Daisaku
We report on the multi-wavelength photometry of the 2018 superoutburst in EG Cnc. We have detected stage A superhumps and long-lasting late-stage superhumps via the optical photometry and have constrained the binary mass ratio and its possible range.
Externí odkaz:
http://arxiv.org/abs/2008.11871
Autor:
Sugizaki, Mutsumi, Oeda, Motoki, Kawai, Nobuyuki, Mihara, Tatehiro, Makishima, Kazuo, Nakajima, Motoki
This paper reports on the X-ray emission evolution of the ultra-luminous Galactic X-ray pulsar, Swift J0243.6+6124, during the 2017-2018 giant outburst observed by the MAXI GSC. The 2-30 keV light curve and the energy spectra confirm that the luminos
Externí odkaz:
http://arxiv.org/abs/2005.07971
Autor:
Namekata, Kosuke, Maehara, Hiroyuki, Sasaki, Ryo, Kawai, Hiroki, Notsu, Yuta, Kowalski, Adam F., Allred, Joel C., Iwakiri, Wataru, Tsuboi, Yohko, Murata, Katsuhiro L., Niwano, Masafumi, Shiraishi, Kazuki, Adachi, Ryo, Iida, Kota, Oeda, Motoki, Honda, Satoshi, Tozuka, Miyako, Katoh, Noriyuki, Onozato, Hiroki, Okamoto, Soshi, Isogai, Keisuke, Kimura, Mariko, Kojiguchi, Naoto, Wakamatsu, Yasuyuki, Tampo, Yusuke, Nogami, Daisaku, Shibata, Kazunari
We report multi-wavelength monitoring observations of an M-dwarf flare star AD Leonis with Seimei Telescope (6150--7930 {\AA}), SCAT (Spectroscopic Chuo-university Astronomical Telescope; 3700--7500 {\AA}), NICER (Neutron Star Interior Composition Ex
Externí odkaz:
http://arxiv.org/abs/2005.04336
Autor:
Tominaga, Mayu, Nakahira, Satoshi, Shidatsu, Megumi, Oeda, Motoki, Ebisawa, Ken, Sugawara, Yasuharu, Negoro, Hitoshi, Kawai, Nubuyuki, Sugizaki, Mutsumi, Ueda, Yoshihiro, Mihara, Tatehiro
We report the first half-year monitoring of the new Galactic black hole candidate MAXI J1348-630, discovered on 2019 January 26 with the Gas Slit Camera (GSC) on-board MAXI. During the monitoring period, the source exhibited two outburst peaks, where
Externí odkaz:
http://arxiv.org/abs/2004.03192
Autor:
Kawabata, Miho, Maeda, Keiichi, Yamanaka, Masayuki, Nakaoka, Tatsuya, Kawabata, Koji, Adachi, Ryo, Akitaya, Hiroshi, Burgaz, Umut, Hanayama, Hidekazu, Horiuchi, Takashi, Hosokawa, Ryohei, Iida, Kota, Imazato, Fumiya, Isogai, Keisuke, Jiang, Ji-an, Katoh, Noriyuki, Kimura, Hiroki, Kino, Masaru, Kuroda, Daisuke, Maehara, Hiroyuki, Matsubayashi, Kazuya, Morihana, Kumiko, Murata, Katsuhiro, Nagao, Takashi, Niwano, Masafumi, Nogami, Daisaku, Oeda, Motoki, Ono, Tatsuharu, Onozato, Hiroki, Otsuka, Masaaki, Saito, Tomoki, Sasada, Mahito, Shiraishi, Kazuki, Sugiyama, Haruki, Taguchi, Kenta, Takahashi, Jun, Takagi, Kengo, Takagi, Seiko, Takayama, Masaki, Tozuka, Miyako, Sekiguchi, Kazuhiro
We present optical observations of type Ia supernova (SN) 2019ein, starting at 2 days after the estimated explosion date. The spectra and the light curves show that SN 2019ein belongs to the High-Velocity (HV) and Bload Line groups with relatively ra
Externí odkaz:
http://arxiv.org/abs/1908.03001
Autor:
Wakako, Akira, Sadato, Akiyo, Oeda, Motoki, Higashiguchi, Saeko, Hayakawa, Motoharu, Oshima, Marie, Hirose, Yuichi
Publikováno v:
Asian Journal of Neurosurgery; 2023, Vol. 18 Issue 3, p499-507, 9p
Publikováno v:
Asian Journal of Neurosurgery
A 42-year-old male presented with diplopia, headache, and nausea. Magnetic resonance imaging (MRI) of the brain showed pineal tumor, and chest computed tomography (CT) demonstrated a lung tumor. Disorientation developed, with occurrence of hydrocepha