Progress of Theoretical and Experimental Physics 2021(5) 2021年5月
<title>Abstract</title>
The Laser Interferometer Gravitational-wave Observatory Scientific Collaboration and Virgo Collaboration (LVC) sent out 56 gravitational-wave (GW) notices during the third observing run (O3). The Japanese Collaboration for...
K. Maeda A. Tajitsu K. S. Kawabata R. J. Foley S. Honda Y. Moritani M. Tanaka O. Hashimoto M. Ishigaki J. D. Simon M. M. Phillips M. Yamanaka D. Nogami A. Arai W. Aoki K. Nomoto D. Milisavljevic P. A. Mazzali A. M. Soderberg M. Schramm B. Sato H. Harakawa N. Morrell N. Arimoto
ASTROPHYSICAL JOURNAL 816(2) 57 2016年1月 [査読有り]
Na I. D absorbing systems toward Type Ia supernovae (SNe Ia) have been intensively studied over the last decade with the aim of finding circumstellar material (CSM), which is an indirect probe of the progenitor system. However, it is difficult to ...
Solar flares are caused by the sudden release of magnetic energy stored near sunspots. They release 10(29) to 10(32) ergs of energy on a timescale of hours(1). Similar flares have been observed on many stars, with larger 'superflares' seen on a va...
Proceedings of the International Astronomical Union 8(293) 393-395 2012年 [査読有り]
We present the results of an extensive survey of superflares on late-type stars (G, K, and M-type main sequence stars) using the Kepler satellite data. Wefound about 6,800 superflares on late-type stars from the data of about 120,000 stars observe...
Tomoki Morokuma Yousuke Utsumi Kouji Ohta Masayuki Yamanaka Koji S. Kawabata Yoshiyuki Inoue Masaomi Tanaka Michitoshi Yoshida Ryosuke Itoh Mahito Sasada Nozomu Tominaga Hiroki Mori Miho Kawabata Tatsuya Nakaoka Maiko Chogi Taisei Abe Ruochen Huang Naoki Kawahara Hiroki Kimura Hiroki Nagashima Kengo Takagi Yuina Yamazaki Wei Liu Ryou Ohsawa Shigeyuki Sako Katsuhiro L. Murata Kumiko Morihana Christina K. Gilligan Keisuke Isogai Mariko Kimura Yasuyuki Wakamatsu Ryuhei Ohnishi Masaki Takayama Satoshi Honda Yoshiki Matsuoka Takuji Yamashita Shigehiro Nagataki Yasuyuki T. Tanaka
Publications of the Astronomical Society of Japan 73(1) 25-43 2020年11月
We present our follow-up observations to search for an electromagnetic
counterpart of the IceCube high-energy neutrino, IceCube-170922A. Monitoring
observations of a likely counterpart, TXS 0506+056, are also described. First,
we quickly took opti...
Soshi Okamoto Yuta Notsu Hiroyuki Maehara Kosuke Namekata Satoshi Honda Kai Ikuta Daisaku Nogami Kazunari Shibata
2020年11月
We report the latest statistical analyses of superflares on solar-type
(G-type main-sequence; effective temperature is 5100 - 6000 K) stars using all
of the primary mission data, and -DR2 (Data Release 2) catalog.
We updated the fla...
We present the results of the high-resolution spectroscopy of the FU
Orionis-type star V960 Mon. The brightness of V960 Mon decreased continuously
after the outburst was detected in 2014 November. During this dimming event, we
have carried out med...
Hiroyuki Maehara Yuta Notsu Kousuke Namekata Satoshi Honda Adam F. Kowalski Noriyuki Katoh Tomohito Ohshima Kota Iida Motoki Oeda Katsuhiro L. Murata Masayuki Yamanaka Kengo Takagi Mahito Sasada Hiroshi Akitaya Kai Ikuta Soshi Okamoto Daisaku Nogami Kazunari Shibata
2020年9月
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 ...
Kai Ikuta Hiroyuki Maehara Yuta Notsu Kosuke Namekata Taichi Kato Shota Notsu Soshi Okamoto Satoshi Honda Daisaku Nogami Kazunari Shibata
The Astrophysical Journal 902(1) 73-73 2020年8月
Starspots are thought to be regions of locally strong magnetic fields,
similar to sunspots, and they can generate photometric brightness modulations.
To deduce stellar and spot properties, such as spot emergence and decay rates,
we implement compu...
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自然・環境科学研究所