Namekata, Kosuke(The HAKUBI Center for Advanced Research) | Activity Database on Education and Research, Kyoto University

Namekata, Kosuke

The HAKUBI Center for Advanced Research Program-Specific Assistant Professor

Last Updated :2026/07/05

Basic Information

Email Address

Email Address
namekata.kosuke.3skyoto-u.ac.jp

Professional Memberships

From Apr. 2017, To Present
Japan Geoscience Union

From Jun. 2016, To Present
Astronomical Society of Japan

From Jan. 2020, To Present
American Astronomical Society

Academic Degree

26 Mar. 2018
京都大学修士（理学）

23 Mar. 2021
京都大学博士（理学）

Academic Resume (Undergraduate School/Majors)

京都大学, 理学部理学科, 卒業

大阪大学, 工学部応用理工学科, 退学

Research History

From Dec. 2024, To Present
The Catholic University of America, Department of Physics, Adjunct Assistant Research Scientist

From Oct. 2024, To Dec. 2024
American University, Department of Physics, Adjunct Research Assistant Professor

From Oct. 2024, To Present
NASA Goddard Space Flight Center, Heliophysics Science Division, JSPS Overseas Research Fellow/Research Associate Scientist

From May 2019, To Sep. 2019
University of Colorado at Boulder, Laboratory for Atmospheric and Space Physics, Visiting Researcher

From Apr. 2024, To Mar. 2025
National Astronomical Observatory of Japan, Division of Science, Special visiting researcher

From Apr. 2024, To Present
Kyoto University, The Hakubi Center for Advanced Research/Graduate School of Science, Program-Specific Assistant Professor

From Sep. 2023, To Mar. 2024
Meisei University, School of Science and Engineering, 非常勤講師

From Apr. 2021, To Mar. 2024
National Astronomical Observatory of Japan, ALMA Project, JSPS fellow PD

From Apr. 2018, To Mar. 2021
Kyoto University, Graduate School of Science, 日本学術振興会特別研究員DC1

ID,URL

ORCID ID
0000-0002-1297-9485
J-Global ID
202301015139711470
Researcher number
30987524
External link
https://www.kwasan.kyoto-u.ac.jp/~namekata/en.html

researchmap URL

https://researchmap.jp/kosuke_namekata

Last Updated :2026/07/05

Research

Research Interests

Solar and stellar astophysics

Observational astronomy

Solar-type stars

Loss-mass stars

Magnetic activity

Solar and stellar flares

Exoplanet's environment

Research Areas

Natural sciences, Astronomy

Natural sciences, Space and planetary science

Papers

High-velocity blueshifts of Hα and Fe XXV Heα lines during superflares of the RS CVn-type stars
Shun Inoue; Teruaki Enoto; Yuta Notsu; Hiroyuki Uchida; Kosuke Namekata; Hiroyuki Maehara; Satoshi Honda; Wataru Buz Iwakiri; Miki Kurihara; Masahiro Tsujimoto; Keiichi Namizaki; Takeshi Go Tsuru; Daisaku Nogami; Kazunari Shibata
Proceedings of the International Astronomical Union, Dec. 2024

Multiwavelength Campaign Observations of a Young Solar-type Star, EK Draconis. III. Comparison between Starspot Mapping, Zeeman Doppler Imaging, and Multiwavelength Variability
Kai Ikuta; Kosuke Namekata; Pascal Petit; Vladimir S. Airapetian; Hiroyuki Maehara; Yuta Notsu; Aline A. Vidotto; Keith Gendreau; Sandra V. Jeffers; Stephen Marsden; Julien Morin; Coralie Neiner; Rishi R. Paudel; Daisaku Nogami; Kazunari Shibata
The Astrophysical Journal, 02 Apr. 2026

X-ray and H α superflare on an RS CVn-type star, UX Arietis: Constraint on the flare location from radial velocity change during the flare
Sota Urabe; Yohko Tsuboi; Kosuke Namekata; Sakura Nawa; Hiroyuki Maehara; Noboru Nemoto; Yuta Notsu; Wataru Iwakiri
Publications of the Astronomical Society of Japan, 30 Dec. 2025

Simultaneous Optical and Radio Observations of a Large Stellar Flare on EV Lac
Hong-Peng Lu; Jia-Le Zhang; Hui Tian; Li-Yun Zhang; He-Chao Chen; Jie Zheng; Jun-Bo Zhang; Jian-Guo Wang; Shun Inoue; Hiroyuki Maehara; Kosuke Namekata
The Astrophysical Journal Letters, 01 Sep. 2025

A Semiempirical Estimate of Solar Extreme-ultraviolet Evolution from 10 Myr to 10 Gyr
Kevin France; Girish Duvvuri; Cynthia S. Froning; Alexander Brown; P. Christian Schneider; J. Sebastian Pineda; David Wilson; Allison Youngblood; Vladimir S. Airapetian; Kosuke Namekata; Yuta Notsu; Tristen Sextro
The Astronomical Journal, 11 Aug. 2025

Systematic NICER study of the low-ionized Fe Kα line on RS Canum Venaticorum-type stars
Shun Inoue; Teruaki Enoto; Yuta Notsu; Hiroyuki Uchida; Wataru Buz Iwakiri; Kosuke Namekata; Keith Gendreau
Monthly Notices of the Royal Astronomical Society, 28 Jun. 2025

High-time-cadence Spectroscopy and Photometry of Stellar Flares on M dwarf YZ Canis Minoris with the Seimei Telescope and TESS. I. Discovery of Rapid and Short-duration Prominence Eruptions
Yuto Kajikiya; Kosuke Namekata; Yuta Notsu; Hiroyuki Maehara; Bunei Sato; Daisaku Nogami
The Astrophysical Journal, 01 Jan. 2025

Rising Near-ultraviolet Spectra in Stellar Megaflares
Adam F. Kowalski; Rachel A. Osten; Yuta Notsu; Isaiah I. Tristan; Antigona Segura; Hiroyuki Maehara; Kosuke Namekata; Shun Inoue
The Astrophysical Journal, 26 Dec. 2024

Multiwavelength Campaign Observations of a Young Solar-type Star, EK Draconis. II. Understanding Prominence Eruption through Data-driven Modeling and Observed Magnetic Environment
Kosuke Namekata; Kai Ikuta; Pascal Petit; Vladimir S. Airapetian; Aline A. Vidotto; Petr Heinzel; Jiří Wollmann; Hiroyuki Maehara; Yuta Notsu; Shun Inoue; Stephen Marsden; Julien Morin; Sandra V. Jeffers; Coralie Neiner; Rishi R. Paudel; Antoaneta A. Avramova-Boncheva; Keith Gendreau; Kazunari Shibata
The Astrophysical Journal, 27 Nov. 2024
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Assessing the capability of a model-based stellar XUV estimation
Munehito Shoda; Kosuke Namekata; Shinsuke Takasao
Astronomy & Astrophysics, 08 Nov. 2024

Multiwavelength Campaign Observations of a Young Solar-type Star, EK Draconis. I. Discovery of Prominence Eruptions Associated with Superflares
Kosuke Namekata; Vladimir S. Airapetian; Pascal Petit; Hiroyuki Maehara; Kai Ikuta; Shun Inoue; Yuta Notsu; Rishi R. Paudel; Zaven Arzoumanian; Antoaneta A. Avramova-Boncheva; Keith Gendreau; Sandra V. Jeffers; Stephen Marsden; Julien Morin; Coralie Neiner; Aline A. Vidotto; Kazunari Shibata
The Astrophysical Journal, 01 Jan. 2024

Temporal Variation of Flare Occurrence Rates via the Spot Evolution on the Sun and Solar-type Stars
Takato Tokuno; Kosuke Namekata; Hiroyuki Maehara; Shin Toriumi
The Astrophysical Journal, May 2025, Peer-reviewed

Doppler imaging combined with high-cadence photometry
S. Lee; E. Bahar; H. V. Şenavcı; E. Işık; K. Ikuta; K. Namekata; H. Nagata; K. Kawauchi; M. Omiya; H. Izumiura; A. Tajitsu; B. Sato; S. Honda; D. Nogami
Astronomy & Astrophysics, 02 Mar. 2026

Discovery of multi-temperature coronal mass ejection signatures from a young solar analogue
Kosuke Namekata; Kevin France; Jongchul Chae; Vladimir S. Airapetian; Adam Kowalski; Yuta Notsu; Peter R. Young; Satoshi Honda; Soosang Kang; Juhyung Kang; Kyeore Lee; Hiroyuki Maehara; Kyoung-Sun Lee; Cole Tamburri; Tomohito Ohshima; Masaki Takayama; Kazunari Shibata
Nature Astronomy, 27 Oct. 2025

Do Young Suns Produce Frequent, Massive CMEs? Results from Five-year Dedicated Optical Observations of EK Draconis and V889 Hercules
Kosuke Namekata; Hiroyuki Maehara; Yuta Notsu; Satoshi Honda; Kai Ikuta; Daisaku Nogami; Kazunari Shibata
The Astrophysical Journal, 27 Oct. 2025
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Time evolution of a white-light flare accompanied by probable postflare loops on the M-type dwarf EV Lacertae
Shinnosuke Ichihara; Daisaku Nogami; Kosuke Namekata; Hiroyuki Maehara; Yuta Notsu; Kai Ikuta; Satoshi Honda; Takato Otsu; Kazunari Shibata
Publications of the Astronomical Society of Japan, 01 Aug. 2025

High-time-cadence Spectroscopy and Photometry of Stellar Flares on M-dwarf YZ Canis Minoris with Seimei Telescope and TESS. II. Statistical Properties of Blue/Red Asymmetries in the Hα Line
Yuto Kajikiya; Kosuke Namekata; Yuta Notsu; Kai Ikuta; Hiroyuki Maehara; Bunei Sato; Daisaku Nogami
The Astrophysical Journal, 20 May 2025

Multiwavelength observation of an active M-dwarf star EV Lacertae and its stellar flare accompanied by a delayed prominence eruption
Shun Inoue; Teruaki Enoto; Kosuke Namekata; Yuta Notsu; Satoshi Honda; Hiroyuki Maehara; Jiale Zhang; Hong-Peng Lu; Hiroyuki Uchida; Takeshi Go Tsuru; Daisaku Nogami; Kazunari Shibata
Publications of the Astronomical Society of Japan, 29 Jan. 2024

Comparison of Solar Multifrequency Microwave Data with Other Solar Indices for Understanding Solar and Stellar Microwave Data
Masumi Shimojo; Kosuke Namekata; Kazumasa Iwai; Ayumi Asai; Kyoko Watanabe
The Astrophysical Journal, 01 Apr. 2024, Peer-reviewed

Apache Point Observatory (APO)/SMARTS Flare Star Campaign Observations. I. Blue Wing Asymmetries in Chromospheric Lines during Mid-M-Dwarf Flares from Simultaneous Spectroscopic and Photometric Observation Data
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, 25 Jan. 2024

Magnitude Estimates for the Carrington Flare in 1859 September: As Seen from the Original Records
Hisashi Hayakawa; Sabrina Bechet; Frédéric Clette; Hugh S. Hudson; Hiroyuki Maehara; Kosuke Namekata; Yuta Notsu
The Astrophysical Journal Letters, 29 Aug. 2023

Starspot Mapping with Adaptive Parallel Tempering. II. Application to TESS Data for M-dwarf Flare Stars AU Microscopii, YZ Canis Minoris, and EV Lacertae
Kai Ikuta; Kosuke Namekata; Yuta Notsu; Hiroyuki Maehara; Soshi Okamoto; Satoshi Honda; Daisaku Nogami; Kazunari Shibata
The Astrophysical Journal, 01 May 2023
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Detection of a High-velocity Prominence Eruption Leading to a CME Associated with a Superflare on the RS CVn-type Star V1355 Orionis
Shun Inoue; Hiroyuki Maehara; Yuta Notsu; Kosuke Namekata; Satoshi Honda; Keiichi Namizaki; Daisaku Nogami; Kazunari Shibata
The Astrophysical Journal, 27 Apr. 2023
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A Superflare on YZ Canis Minoris Observed by the Seimei Telescope and TESS: Red Asymmetry of Hα Emission Associated with White-light Emission
Keiichi Namizaki; Kosuke Namekata; Hiroyuki Maehara; Yuta Notsu; Satoshi Honda; Daisaku Nogami; Kazunari Shibata
The Astrophysical Journal, 01 Mar. 2023
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Reconstructing the XUV Spectra of Active Sun-like Stars Using Solar Scaling Relations with Magnetic Flux
Kosuke Namekata; Shin Toriumi; Vladimir Airapetian; Munehito Shoda; Kyoko Watanabe; Yuta Notsu
The Astrophysical Journal, 01 Mar. 2023

Sun-as-a-star Analyses of Various Solar Active Events Using Hα Spectral Images Taken by SMART/SDDI
Takato Otsu; Ayumi Asai; Kiyoshi Ichimoto; Takako T. Ishii; Kosuke Namekata
The Astrophysical Journal, 01 Nov. 2022
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Universal Scaling Laws for Solar and Stellar Atmospheric Heating: Catalog of Power-law Index between Solar Activity Proxies and Various Spectral Irradiances
Shin Toriumi; Vladimir Airapetian; Kosuke Namekata; Yuta Notsu
The Astrophysical Journal Supplement Series, 01 Oct. 2022

Sun-as-a-star Analysis of Hα Spectra of a Solar Flare Observed by SMART/SDDI: Time Evolution of Red Asymmetry and Line Broadening
Kosuke Namekata; Kiyoshi Ichimoto; Takako T. Ishii; Kazunari Shibata
The Astrophysical Journal, 01 Jul. 2022

The Atmospheric Response to High Nonthermal Electron-beam Fluxes in Solar Flares. II. Hydrogen-broadening Predictions for Solar Flare Observations with the Daniel K. Inouye Solar Telescope
Adam Kowalski; Joel Allred; Mats Carlsson; Graham S. Kerr; Pier-Emmanuel Tremblay; Kosuke Namekata; David Kuridze; Han Uitenbroek
The Astrophysical Journal, 01 Apr. 2022

Discovery of a Long-duration Superflare on a Young Solar-type Star EK Draconis with Nearly Similar Time Evolution for Hα and White-light Emissions
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; Daisaku Nogami; Kazunari Shibata
The Astrophysical Journal Letters, 01 Feb. 2022
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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
Nature Astronomy, 09 Dec. 2021

Spectroscopic and photometric observations of dwarf nova superoutbursts by the 3.8 m telescope Seimei and the Variable Star Network
Yusuke Tampo; Keisuke Isogai; Naoto Kojiguchi; Hiroyuki Maehara; Kenta Taguchi; Taichi Kato; Mariko Kimura; Yasuyuki Wakamatsu; Masaaki Shibata; Daisaku Nogami; Miho Kawabata; Keiichi Maeda; Kosuke Namekata; Soshi Okamoto; Masaaki Otsuka; Umut Burgaz; Shumpei Nagoshi; Hiroshi Itoh; Tonny Vanmunster; Tamás Tordai; Geoffrey Stone; Katsura Matsumoto; Daiti Fujii; Ryota Matsumura; Momoka Nakagawa; Nodoka Takeuchi; Yuki Zenkou; Elena P Pavlenko; Kirill A Antonyuk; Nikolaj V Pit; Oksana I Antonyuk; Julia V Babina; Aleksei V Baklanov; Aleksei A Sosnovskij; Sergey Yu Shugarov; Nataly Katysheva; Drahomír Chochol; Shawn Dvorak; Pavol A Dubovsky; Tomáš Medulka; Igor Kudzej; Seiichiro Kiyota; Alexandra M Zubareva; Alexandr A Belinski; Natalia P Ikonnikova; Marina A Burlak; Yasuo Sano; Masanori Mizutani; Javier Ruiz; Roger D. Pickard; Franz-Josef Hambsch
Publications of the Astronomical Society of Japan, 13 Jun. 2021

Time-resolved spectroscopy and photometry of M dwarf flare star YZ Canis Minoris with OISTER and TESS: Blue asymmetry in the Hα line during the non-white light flare
Hiroyuki Maehara; Yuta Notsu; Kosuke 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
Publications of the Astronomical Society of Japan, 05 Feb. 2021

Statistical Properties of Superflares on Solar-type Stars: Results Using All of the Kepler Primary Mission Data
Soshi Okamoto; Yuta Notsu; Hiroyuki Maehara; Kosuke Namekata; Satoshi Honda; Kai Ikuta; Daisaku Nogami; Kazunari Shibata
The Astrophysical Journal, 11 Jan. 2021

Starspot Mapping with Adaptive Parallel Tempering. I. Implementation of Computational Code
Kai Ikuta; Hiroyuki Maehara; Yuta Notsu; Kosuke Namekata; Taichi Kato; Shota Notsu; Soshi Okamoto; Satoshi Honda; Daisaku Nogami; Kazunari Shibata
The Astrophysical Journal, 13 Oct. 2020

Optical and X-ray observations of stellar flares on an active M dwarf AD Leonis with the Seimei Telescope, SCAT, NICER, and OISTER
Kosuke Namekata; Hiroyuki Maehara; Ryo Sasaki; Hiroki Kawai; Yuta Notsu; Adam F Kowalski; Joel C Allred; Wataru Iwakiri; Yohko Tsuboi; Katsuhiro L Murata; Masafumi Niwano; Kazuki Shiraishi; Ryo Adachi; Kota Iida; Motoki Oeda; Satoshi Honda; Miyako Tozuka; Noriyuki Katoh; Hiroki Onozato; Soshi Okamoto; Keisuke Isogai; Mariko Kimura; Naoto Kojiguchi; Yasuyuki Wakamatsu; Yusuke Tampo; Daisaku Nogami; Kazunari Shibata
Publications of the Astronomical Society of Japan, 01 Aug. 2020

Temporal Evolution of Spatially Resolved Individual Star Spots on a Planet-hosting Solar-type Star: Kepler-17
Kosuke Namekata
Institute of Physics Publishing IOP, Mar. 2020

Impact of Stellar Superflares on Planetary Habitability
Yosuke Yamashiki; Hiroyuki Maehara; Vladimir Airapetian; Yuta Notsu; Tatsuhiko Sato; Shota Notsu; Ryusuke Kuroki; Keiya Murashima; Hiroaki Sato; Kosuke Namekata; Takanori Sasaki; Thomas B. Scott; Hina Bando; Subaru Nashimoto; Fuka Takagi; Cassandra Ling; Daisaku Nogami; Kazunari Shibata
The Astrophysical Journal, 20 Aug. 2019

Do Kepler Superflare Stars Really Include Slowly Rotating Sun-like Stars?—Results Using APO 3.5 m Telescope Spectroscopic Observations and Gaia-DR2 Data
Yuta Notsu; Hiroyuki Maehara; Satoshi Honda; Suzanne L. Hawley; James R. A. Davenport; Kosuke Namekata; Shota Notsu; Kai Ikuta; Daisaku Nogami; Kazunari Shibata
The Astrophysical Journal, 03 May 2019, Peer-reviewed

The extreme space weather event in September 1909
Hisashi Hayakawa; Yusuke Ebihara; Edward W Cliver; Kentaro Hattori; Shin Toriumi; Jeffrey J Love; Norio Umemura; Kosuke Namekata; Takahito Sakaue; Takuya Takahashi; Kazunari Shibata
Monthly Notices of the Royal Astronomical Society, 11 Apr. 2019

Lifetimes and Emergence/Decay Rates of Star Spots on Solar-type Stars Estimated by Kepler Data in Comparison with Those of Sunspots
Kosuke Namekata
The Astrophysical Journal, 30 Jan. 2019

Time-resolved spectroscopic observations of an M-dwarf flare star EV Lacertae during a flare
Satoshi Honda; Yuta Notsu; Kosuke Namekata; Shota Notsu; Hiroyuki Maehara; Kai Ikuta; Daisaku Nogami; Kazunari Shibata
Publications of the Astronomical Society of Japan, 01 Aug. 2018

Statistical Studies of Solar White-light Flares and Comparisons with Superflares on Solar-type Stars
Kosuke Namekata
The Astrophysical Journal, 15 Dec. 2017

Starspot activity and superflares on solar-type stars
Hiroyuki Maehara; Yuta Notsu; Shota Notsu; Kosuke Namekata; Satoshi Honda; Takako T. Ishii; Daisaku Nogami; Kazunari Shibata
Publications of the Astronomical Society of Japan, Jun. 2017

Spectroscopic observations of active solar-analog stars with high X-ray luminosity, as a proxy of superflare stars
Yuta Notsu; Satoshi Honda; Hiroyuki Maehara; Shota Notsu; Kosuke Namekata; Daisaku Nogami; Kazunari Shibata
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN, Feb. 2017, Peer-reviewed

Superoutburst of WZ Sge-type dwarf nova below the period minimum: ASASSN-15po
Kosuke Namekata
Publications of the Astronomical Society of Japan, 01 Feb. 2017

Validation of a scaling law for the coronal magnetic field strength and loop length of solar and stellar flares
Kosuke Namekata
Publications of the Astronomical Society of Japan, 01 Feb. 2017

Misc.

Warm and cool components found in an eruption from a solar analogue
Kosuke Namekata; Vladimir Airapetian
Nature Astronomy, 07 Nov. 2025

Solar x-ray CubeSat for high-resolution spectroscopic polarimetry with x-ray SOI sensor and bent Bragg crystals
Hikaru Uebayashi; Takeshi G. Tsuru; Teruaki Enoto; Hiroyuki Uchida; Ayumi Asai; Kosuke Namekata; Naoki Tsuji; Shun Inoue; Yohko Tsuboi; Tomokage Yoneyama; Haruka Sugai; Takahiro Seguchi; Toru Tamagawa; Yoshitomo Maeda; Daiki Ishi; Ryusei Komatsu; Seang Shim; Yusuke Sawanishi; Riko Shimizu; Takayuki Shihara; Tatsuya Narumi; Hideki Yoshikado; Raiki Kudo; Takuro Mito; Shota Ito; Masaki Numazawa
UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XXIV, 29 Sep. 2025

The Exospace Weather Frontier
R. O. P. Loyd; E. L. Shkolnik; J. Lazio; G. W. Hallinan; J. Alvarado-Gómez; L. Amaral; I. Davis; A. Farrish; J. Green; D. Brain; B. Chen; C. Cohen; S. Curry; K. Dissauer; A. Egan; N. Gopalswamy; N. Gronoff; S. Habbal; R. Hu; M. Jin; J. P. Mason; R. Murray-Clay; K. Namekata; R. Osten; A. Segura; A. Veronig; A. Vidotto; M. Wilson; Y. Xu
Report prepared for the W. M. Keck Institute for Space Studies (KISS), California Institute of Technology, 2025, Invited

Overview of the LAPYUTA mission (Life-environmentology, Astronomy, and PlanetarY Ultraviolet Telescope Assembly)
Fuminori Tsuchiya; Go Murakami; Atsushi Yamazaki; Shingo Kameda; Tomoki Kimura; Ryoichi Koga; Kei Masunaga; Shotaro Sakai; Masahiro Ikoma; Akifumi Nakayama; Masami Ouchi; Masaomi Tanaka; Shin Toriumi; Masato Kagitani; Kazuo Yoshioka; Chihiro Tao; Hajime Kita; Hidenobu Yajima; Hideo Sagawa; Hiromu Nakagawa; Hitoshi Hamori; Jun Kimura; Keigo Enya; Kosuke Namekata; Manabu Yamada; Masaki Kuwabara; Naoki Terada; Naoya Ozaki; Norio Narita; Sae Aizawa; Seiko Takagi; Shinitiro Sakai; Shohei Aoki; Shoya Matsuda; Shuya Tan; Takahiro Sumi; Takanori Kodama; Takashi Moriya; Takatoshi Shibuya; Takehiko Satoh; Taro Kawano; Nozomu Tominaga; Toshifumi Shimizu; Yasumasa Kasaba; Yoichi Yatsu; Yoshiaki Ono; Yudai Suzuki; Yuichi Matsuda; Yuki Harada; Yuta Notsu
Space Telescopes and Instrumentation 2024: Ultraviolet to Gamma Ray, 21 Aug. 2024

M型矮星YZ CMiのフレアの測光・分光同時観測 II:プロミネンス噴出の統計性調査
梶木屋裕斗; 行方宏介; 行方宏介; 幾田佳; 野津湧太; 前原裕之; 佐藤文衛; 野上大作
日本天文学会年会講演予稿集, 2025

測光分光同時観測で迫るM型星フレア可視連続光の短時間での時間発展
市原晋之介; 野上大作; 前原裕之; 行方宏介; 野津湧太; 柴田一成; 本田敏志; 幾田佳
日本天文学会年会講演予稿集, 2024

M型星フレアの彩層線輝線輪郭の青方偏移現象 III:M型星のコロナ質量放出
野津湧太; 野津湧太; 野津湧太; KOWALSKI Adam; KOWALSKI Adam; TRISTAN Isaiah; TRISTAN Isaiah; 前原裕之; 行方宏介; 濱口健二; 濱口健二; DAVENPORT James; HAWLEY Suzanne; 本田敏志; 幾田佳; 榎戸輝揚; 井上峻; 浪崎桂一; 野上大作; 柴田一成
日本天文学会年会講演予稿集, 2023

可視光測光・分光同時観測で迫る恒星スーパーフレアの彩層放射メカニズム
浪崎桂一; 行方宏介; 前原裕之; 野津湧太; 野津湧太; 本田敏志; 幾田佳; 野上大作; 柴田一成
日本天文学会年会講演予稿集, 2022

M型星フレア中における,彩層線輝線輪郭の青方偏移現象の分光・測光観測
野津湧太; 野津湧太; 野津湧太; KOWALSKI Adam; KOWALSKI Adam; TRISTAN Isaiah; TRISTAN Isaiah; 前原裕之; 行方宏介; 本田敏志; 幾田佳; 岡本壮師; 野上大作; 柴田一成; 榎戸輝揚; 濱口健二; 濱口健二; DAVENPORT James; HAWLEY Suzanne
日本天文学会年会講演予稿集, 2022

K型主系列星V833 Tauのスーパーフレアの高時間分解能分光観測
前原裕之; 行方宏介; 野津湧太; 野津湧太; 野津湧太; 本田敏志; 幾田佳; 浪崎桂一; 井上峻; 野上大作; 柴田一成
日本天文学会年会講演予稿集, 2022

せいめい望遠鏡によるK型星BF Lynのスーパーフレアの高時間分解能分光観測
前原裕之; 行方宏介; 野津湧太; 野津湧太; 野津湧太; 本田敏志; 幾田佳; 浪崎桂一; 井上峻; 野上大作; 柴田一成
日本天文学会年会講演予稿集, 2022

白色光/Hα線同時観測による恒星スーパーフレア中の短周期QPPの検出
浪崎桂一; 行方宏介; 前原裕之; 野津湧太; 野津湧太; 本田敏志; 幾田佳; 高棹真介; 野上大作; 柴田一成
日本天文学会年会講演予稿集, 2022

M型星フレアの彩層線輝線輪郭の青方偏移現象II:NICERでのX線同時観測
野津湧太; 野津湧太; 野津湧太; KOWALSKI Adam; TRISTAN Isaiah; 前原裕之; 行方宏介; 濱口健二; 濱口健二; 榎戸輝揚; DAVENPORT James; HAWLEY Suzanne; 本田敏志; 幾田佳; 野上大作; 柴田一成
日本天文学会年会講演予稿集, 2022

多波長モニタ観測で探るM型星フレアのバルマー線の輝線輪郭非対称性III
野津湧太; KOWALSKI Adam; TRISTAN Isaiah; 前原裕之; 行方宏介; 本田敏志; 岡本壮師; 幾田佳; 野上大作; 柴田一成; DAVENPORT James; HAWLEY Suzanne
日本天文学会年会講演予稿集, 2021

Kepler全データの解析による太陽型星スーパーフレアの統計的性質
岡本壮師; 前原裕之; 野津湧太; 幾田佳; 行方宏介; 本田敏志; 野上大作; 柴田一成
日本天文学会年会講演予稿集, 2021

M型星フレアのHα線分光・可視光測光観測で迫る恒星の噴出現象
行方宏介; 岡本壮師; 前原裕之; 野津湧太; 野津湧太; 野津湧太; 本田敏志; 幾田佳; 浪崎桂一; 野上大作; 柴田一成
日本天文学会年会講演予稿集, 2021

K型主系列星LQ Hyaにおけるスーパーフレアの測光分光同時観測
前原裕之; 行方宏介; 岡本壮師; 野津湧太; 野津湧太; 野津湧太; 本田敏志; 幾田佳; 野上大作; 柴田一成
日本天文学会年会講演予稿集, 2021

多波長モニタ観則で探るM型星フレアのバルマー線の輝線輪郭非対称性
野津湧太; KOWALSKI Adam; 前原裕之; 行方宏介; 本田敏志; 榎戸輝揚; 濱口健二; 野津翔太; 岡本壮師; 幾田佳; 野上大作; 柴田一成; DAVENPORT James; HAWLEY Suzanne
日本天文学会年会講演予稿集, 2020

Kepler全データを使った太陽類似星スーパーフレアの統計解析
岡本壮師; 前原裕之; 野津湧太; 野津翔太; 幾田佳; 行方宏介; 本田敏志; 野上大作; 柴田一成
日本天文学会年会講演予稿集, 2020

太陽型星のスーパーフレアに伴うHα線放射・プラズマ噴出現象の世界初検出
行方宏介; 前原裕之; 本田敏志; 野津湧太; 岡本壮師; 磯貝桂介; 石井貴子; 一本潔; 浅井歩; 幾田佳; 野上大作; 柴田一成
日本天文学会年会講演予稿集, 2020

多波長モニタ観測で探るM型星フレアのバルマー線の輝線輪郭非対称性 II
野津湧太; KOWALSKI Adam; 前原裕之; 行方宏介; 本田敏志; 榎戸輝揚; 濱口健二; 濱口健二; 岡本壮師; 幾田佳; 野上大作; 柴田一成; DAVENPORT James; HAWLEY Suzanne
日本天文学会年会講演予稿集, 2020

光赤外線大学間連携とTESSによるフレア星YZ CMiの測光分光同時観測
前原裕之; 本田敏志; 野津湧太; 野津翔太; 行方宏介; 幾田佳; 野上大作; 柴田一成; 山中雅之; 加藤則行; 大島誠人; 村田勝寛; 飯田康太; 大枝幹; 高木健吾; 笹田真人; 秋田谷洋
日本天文学会年会講演予稿集, 2019

恒星フレアにおける元素合成の可能性
關嵩覚; 澤田涼; 本田敏志; 前原裕之; 野津湧太; 幾田佳; 行方宏介; 野津翔太; 野上大作; 柴田一成
日本天文学会年会講演予稿集, 2019

G,K.M型星の恒星黒点の統計的性質とフレア活動性との関係
前原裕之; 野津湧太; 野津翔太; 行方宏介; 幾田佳; 野上大作; 柴田一成; 山敷庸亮; 本田敏志
日本天文学会年会講演予稿集, 2019

惑星トランジットを用いた,空間分解された恒星黒点の面積の時間変化の推定
行方宏介; DAVENPORT James; MORRIS Brett; HAWLEY Suzanne; 前原裕之; 野津湧太; 野津翔太; 幾田佳; 野上大作; 柴田一成; 本田敏志
日本天文学会年会講演予稿集, 2019

Do Kepler superflare stars really include slowly-rotating Sun-like stars?-Results using Gaia-DR2 stellar radius data-
野津湧太; 前原裕之; 本田敏志; HAWLEY Suzanne; DAVENPORT James; 行方宏介; 幾田佳; 野津翔太; 野上大作; 柴田一成
日本天文学会年会講演予稿集, 2019

TESSで観測される明るい太陽型スーパーフレア星候補の高分散分光観測
野津湧太; 前原裕之; HAWLEY Suzanne; DAVENPORT James; 本田敏志; 行方宏介; 幾田佳; 野津翔太; 野上大作; 柴田一成
日本天文学会年会講演予稿集, 2018

G,K,M型星におけるスーパーフレアのエネルギーと継続時間の関係
前原裕之; 野津湧太; 野津翔太; 行方宏介; 幾田佳; 野上大作; 柴田一成; 本田敏志
日本天文学会年会講演予稿集, 2018

適応的交換モンテカルロ法で探るスーパーフレア星の巨大黒点の寿命と面積
幾田佳; 前原裕之; 野津湧太; 行方宏介; 野津翔太; 本田敏志; 野上大作; 柴田一成
日本天文学会年会講演予稿集, 2018

太陽黒点と太陽型星の巨大黒点群の時間発展の比較
行方宏介; 前原裕之; 野津湧太; 野津翔太; 幾田佳; 本田敏志; 野上大作; 柴田一成
日本天文学会年会講演予稿集, 2018

巨大黒点を持つ近傍太陽型星のK2ミッション測光観測と同時高分散分光観測
野津湧太; 前原裕之; 行方宏介; 幾田佳; 野津翔太; 野上大作; 柴田一成; 本田敏志; HAWLEY Suzanne; DAVENPORT James
日本天文学会年会講演予稿集, 2018

G,K,M型星におけるフレアと恒星黒点の関係
前原裕之; 野津湧太; 野津翔太; 行方宏介; 幾田佳; 石井貴子; 野上大作; 柴田一成; 本田敏志
日本天文学会年会講演予稿集, 2017

ベイズ推定で迫るスーパーフレア星の巨大黒点の寿命及び差動回転の検証
幾田佳; 行方宏介; 野津湧太; 野津翔太; 前原裕之; 本田敏志; 野上大作; 柴田一成
日本天文学会年会講演予稿集, 2017

太陽型星の巨大黒点群の時間発展~太陽黒点との比較~
行方宏介; 前原裕之; 野津湧太; 野津翔太; 幾田佳; 早川尚志; 本田敏志; 野上大作; 柴田一成
日本天文学会年会講演予稿集, 2017

Spectroscopic observations of solar-type superflare stars found from Kepler short (1-min) time cadence data
野津湧太; 前原裕之; HAWLEY Suzanne; 本田敏志; 行方宏介; 幾田佳; 野津翔太; 野上大作; 柴田一成
日本天文学会年会講演予稿集, 2017

適応的交換モンテカルロ法を用いたスーパーフレア星の多次元パラメータ推定
幾田佳; 前原裕之; 野津湧太; 行方宏介; 野津翔太; 本田敏志; 野上大作; 柴田一成
日本天文学会年会講演予稿集, 2017

高い磁気活動を示す近傍の太陽型星のコロナ温度とEmission Measureの探査,及びスーパーフレア星との比較
野津湧太; 前原裕之; 本田敏志; 野津翔太; 行方宏介; 幾田佳; 野上大作; 柴田一成
日本天文学会年会講演予稿集, 2016

太陽型星の光度変動に対するマルコフ連鎖モンテカルロ法の適用
幾田佳; 野上大作; 前原裕之; 野津湧太; 野津翔太; 行方宏介; 柴田一成; 本田敏志
日本天文学会年会講演予稿集, 2016

太陽型星スーパーフレアに伴うプロミネンス噴出モデル
幾田佳; 大津天斗; 浅井歩; 行方宏介; 柴田一成
日本天文学会年会講演予稿集, 2024

Starspot mapping and multi-wavelength variability for a young solar-type star
幾田佳; 行方宏介; 前原裕之; AIRAPETIAN Vladimir; PETIT Pascal; 野津湧太; 柴田一成
日本天文学会年会講演予稿集, 2024

データ科学による恒星表面マッピング
幾田佳; 森万由子; 福井暁彦; 成田憲保; 行方宏介; 前原裕之; 野津湧太; 本田敏志; 野上大作; 柴田一成
日本天文学会年会講演予稿集, 2023

Starspot mapping with parallel tempering for TESS data of M-type flare stars
幾田佳; 前原裕之; 野津湧太; 行方宏介; 加藤太一; 岡本壮師; 野津翔太; 本田敏志; 野上大作; 柴田一成
日本天文学会年会講演予稿集, 2021

Starspot mapping with parallel tempering for TESS data of M-type flare stars. II. The variation of light curves in two years
幾田佳; 前原裕之; 野津湧太; 野津湧太; 行方宏介; 岡本壮師; 本田敏志; 野上大作; 柴田一成
日本天文学会年会講演予稿集, 2021

Statistical Study of Solar White-light Flares and Comparison with Superflares on Solar-type Stars
Kosuke Namekata; Takahito Sakaue; Kyoko Watanabe; Ayumi Asai; Hiroyuki Maehara; Yuta Notsu; Shota Notsu; Satoshi Honda; Takako T. Ishii; Kai Ikuta; Daisaku Nogami; Kazunari Shibata
Proceedings of the International Astronomical Union, Feb. 2018

High Dispersion Spectroscopy Of Solar-Type Superflare Stars With Subaru/Hds
Yuta Notsu; Satoshi Honda; Hiroyuki Maehara; Shota Notsu; Takuya Shibayama; Kosuke Namekata; Daisaku Nogami; Kazunari Shibata
Zenodo, 24 Jul. 2016

Statistical Properties Of Superflares On Solar-Type Stars With Kepler Data
Yuta Notsu; Hiroyuki Maehara; Takuya Shibayama; Satoshi Honda; Shota Notsu; Kosuke Namekata; Daisaku Nogami; Kazunari Shibata
Zenodo, 24 Jul. 2016

Presentations

Coronal Mass Ejections from Superflares on Solar-Type Stars
Kosuke Namekata
Cool Stars, 17 Jun. 2026, Invited

Books and Other Publications

世界を驚かせた太陽型星のスーパーフレアの発見
行方宏介, Single work
岩波書店『科学』2024年12月号特集「スーパーフレアの時代」, Dec. 2024

多波長同時観測で開く恒星スーパーフレア
行方宏介, Single work
日本天文学会『天文月報』「欧文研究報告論文賞」, 2024

恒星フレアから探る惑星の生命居住環境
行方宏介, Single work
NPO法人花山星空ネットワーク『あすとろん』, 2023

太陽型星で発生したスーパーフレアに伴う巨大フィラメントの放出を捉えた
行方宏介, Single work
くらむぽん出版『大学ジャーナル』, 2022

京大せいめい望遠鏡による「スーパーフレア」観測～惑星への影響評価に向けて～
行方宏介, Single work
公益社団法人日本アイソトープ協会『Isotope News』No.774, 2021

せいめい望遠鏡で迫る恒星スーパーフレア
行方宏介, Single work
日本天文学会『天文月報』「特集：せいめい望遠鏡（2）」, 2021

Awards

17 Mar. 2021
京都大学総長賞

10 Oct. 2022
U30 Doctoral Scientist/Student Award 2022（AAPPS-DPP）

31 May 2017
Outstanding Student Presentation Award（JpGU-AGU）

Media Coverage

'First light' from the first commercial space science satellite heralds a new era for astronomical data
京都大学, 京都大学, https://www.kyoto-u.ac.jp/en/research-news/2026-03-06-0, Mar. 2026, Internet

超小型紫外線衛星「モーヴ」打ち上げ成功、恒星フレアをモニター観測
アストロアーツ, https://www.astroarts.co.jp/article/hl/a/14324_mauve, 05 Dec. 2025, Internet

恒星フレアの紫外線モニタリング用超小型衛星が観測開始 - 京大など
マイナビニュース, https://news.mynavi.jp/techplus/article/20251204-3761738/, Dec. 2025, Internet

超小型紫外線衛星「MAUVE」プロジェクトへの参加を決定
NAOJ, https://sci.nao.ac.jp/main/en/preparation/participation-in-the-mauve-ultraviolet-smallsat-mission, 21 May 2024, Internet

Young star’s streamer of scorching-hot gas gives astronomers a fiery first
Springer Nature, Nature Research Highlight, https://www.nature.com/articles/d41586-021-03683-0, 14 Dec. 2021, Internet

太陽型星のスーパーフレアから噴出する巨大フィラメントを初検出 —昔の、そして今の惑星環境や文明に与える脅威—
京都大学、兵庫県立大学、コロラド大学、東京工業大学、他, 10 Dec. 2021, Internet

太陽型星のスーパーフレアから噴出する巨大フィラメントを初検出 —昔の、そして今の惑星環境や文明に与える脅威—
国立天文台, https://www.nao.ac.jp/news/science/2021/20211210-okayama.html, 10 Dec. 2021, Internet

「スーパーフレア」詳細観測恒星表面の大爆発現象―京都大など
時事通信, 時事通信, https://www.jiji.com/jc/article?k=2020071000013&g=soc, 10 Jul. 2020, Internet

恒星爆発現象観測京大望遠鏡「せいめい」
産経新聞, 産経新聞, 2020/7/10 24面, 10 Jul. 2020, Paper

スーパーフレア観測成功、京大など…しし座の恒星、太陽フレアの２０倍
読売新聞, 読売新聞, https://www.yomiuri.co.jp/local/kansai/news/20200710-OYO1T50012/, 10 Jul. 2020, Paper

京大・国立天文台、「スーパーフレア」観測磁気変動の影響評価
日刊工業新聞, 日刊工業新聞, https://www.nikkan.co.jp/articles/view/00564073?twinews=20200710, 10 Jul. 2020, Paper

恒星表面の大爆発「スーパーフレア」仕組み一端解明京大望遠鏡「せいめい」で観測 | 京都新聞
京都新聞, 京都新聞, https://www.kyoto-np.co.jp/articles/-/303544, 10 Jul. 2020, Paper

スーパーフレアの観測成功浅口の望遠鏡「せいめい」：山陽新聞デジタル｜さんデジ
山陽新聞, 山陽新聞, https://www.sanyonews.jp/article/1030051, 10 Jul. 2020, Paper

「スーパーフレア」の観測に成功大規模な恒星表面の爆発現象京大など
毎日新聞, 毎日新聞, https://mainichi.jp/articles/20200709/k00/00m/040/150000c, 10 Jul. 2020, Paper

京大など、スーパーフレアを検出最大級の太陽フレアの20倍程度
オリコン、ニコニコニュース、他, https://www.oricon.co.jp/article/1217109/, Jul. 2020, Internet

恒星表面の超巨大爆発「スーパーフレア」の観測成功！
アストロピクス, https://astropics.bookbright.co.jp/ad-leonis, Jul. 2020, Internet

太陽フレア最強クラスの20倍。赤色矮星のスーパーフレアが検出される
SORAE, https://sorae.info/astronomy/20200711-ad-leonis.html, Jul. 2020, Internet

京大研究チーム「スーパーフレア」観測に成功
テレビ朝日, 静岡朝日テレビ, KFB福島放送, 広島ホームテレビ, メ〜テレ, Jul. 2020, Media report

京大など、スーパーフレアを検出最大級の太陽フレアの20倍程度
財経新聞, 財経新聞, Jul. 2020, Paper

超巨大フレア観測京大「せいめい」望遠鏡系外惑星の生命探る一歩に
しんぶん赤旗, しんぶん赤旗, Jul. 2020, Paper

京大せいめい望遠鏡でスーパーフレアの検出に成功―生命居住可能な惑星への影響の理解に向けて―
国立天文台, https://www.nao.ac.jp/news/science/2020/20200710-okayama.html, Jul. 2020, Internet

Flaring, massively
京都大学, https://www.kyoto-u.ac.jp/en/research/research_results/2020/200710_1.html, Jul. 2020, Internet

太陽系外の惑星を調べる超小型紫外線衛星「Mauve」打ち上げ成功
京都大学, https://www.kyoto-u.ac.jp/ja/research-news/2025-12-03, 03 Dec. 2025, Internet

京都大などが「恒星フレア」の高温ガスと低温ガスを同時キャッチ地球誕生の手がかりか
京都新聞, 京都新聞, https://www.kyoto-np.co.jp/articles/-/1604117, 24 Nov. 2025, Paper

若い惑星環境を揺るがす巨大フレアの多温度噴出現象―ハッブル宇宙望遠鏡と日韓地上望遠鏡で同時検出―
京都大学, https://www.kyoto-u.ac.jp/ja/research-news/2025-10-28, Oct. 2025, Internet

若い恒星の巨大フレア観測初期地球への影響手掛かりに―京大など
時事通信, https://www.jiji.com/jc/article?k=2025102700927&g=soc, Oct. 2025, Internet

若い恒星の巨大フレア観測
信濃毎日新聞, Oct. 2025, Paper

若い太陽型の恒星爆発現象を捉えた
しんぶん赤旗, Oct. 2025, Paper

複数温度帯ガス同時観測京大「恒星フレア」で成功
日刊工業新聞社, 日刊工業新聞, Oct. 2025, Paper

若い太陽地球の生命誕生に影響？せいめい望遠鏡（浅口）などスーパーフレアのガス初確認
山陽新聞社, 山陽新聞, https://www.sanyonews.jp/article/1816731, Oct. 2025, Paper

太陽似の若い星巨大フレア観測地球成り立ち解明に日米韓チーム
朝日新聞社, 朝日新聞, https://digital.asahi.com/articles/DA3S16335180.html, Oct. 2025, Paper

京都大学などの国際研究チームが高温ガス噴出の様子などを世界初確認せいめい望遠鏡（岡山・浅口市）などで太陽型の若い恒星を観測
KSBニュース, https://news.ksb.co.jp/article/16122523, Oct. 2025, Media report

ナゾの巨大爆発スーパーフレア
NHK, NHKコズミックフロント, 12 May 2022, Media report

External funds: Kakenhi

Comparative Study of Solar and Stellar Magnetic Activity for Understanding of Space Weather of Exoplanets
Grant-in-Aid for Scientific Research (B)
Basic Section 16010:Astronomy-related
Doshisha University
柴田一成
From 01 Apr. 2024, To 31 Mar. 2027, Granted
恒星フレア;太陽フレア;恒星黒点;太陽黒点;スーパーフレア;デルタ型黒点;分光観測;恒星磁気活動;系外惑星;黒点;質量噴出;磁気活動
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-24K00680/

Unified Understanding of Stellar Superflares from Onset to Consequences by Observation
Grant-in-Aid for Scientific Research (A)
Medium-sized Section 16:Astronomy and related fields
Kyoto University
野上大作
From 01 Apr. 2024, To 31 Mar. 2027, Granted
恒星磁気活動性;分光器開発;黒点;スーパーフレア;質量放出
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-24H00248/

Unveiling the Radiative Mechanisms of Stellar Flares via Ultraviolet Space Observations
Grant-in-Aid for Scientific Research (B)
Basic Section 16010:Astronomy-related
Kyoto University
行方宏介
From 01 Apr. 2025, To 31 Mar. 2029, Granted
恒星フレア;紫外線天文学;系外惑星;恒星磁気活動;X線・紫外線放射
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-25K01041/

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Namekata, Kosuke

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External funds: Kakenhi

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