Curriculum Vitaes
Profile Information
- Affiliation
- Assistant professor, Institute of Space and Astronautical Science, Japan Aerospace Exploration AgencyAssistant professor, Space and Astronautical Science program, The Graduate University for Advanced Studies
- Degree
- Ph. D.(Mar, 1998, Kyoto University)master's degree(Mar, 1995, Kyoto University)
- Researcher number
- 80342624
- ORCID ID
https://orcid.org/0000-0002-9099-5755- J-GLOBAL ID
- 202001011170717781
- researchmap Member ID
- R000011919
Research Areas
2Research History
7-
Apr, 2026 - Present
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Apr, 2007 - Mar, 2026
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Oct, 2003 - Mar, 2007
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Jul, 2001 - Sep, 2003
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Apr, 2001 - Jun, 2001
Education
3-
Apr, 1995 - Mar, 1998
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Apr, 1993 - Apr, 1995
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Apr, 1989 - Mar, 1993
Papers
273-
The Astrophysical Journal, 998(2) 210, Feb, 2026 Peer-reviewed
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Nature, 650(8101) 309-313, Feb, 2026 Peer-reviewed
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Publications of the Astronomical Society of Japan, 78(1) 97-110, Feb, 2026 Peer-reviewedAbstract A high-resolution X-ray spectroscopic observation was made of the RS CVn-type binary star HR 1099 using the Resolve instrument onboard XRISM for its calibration purposes. During the $\sim$400 ks telescope time covering 1.5 binary orbit, a flare lasting for $\sim$100 ks was observed with a released X-ray radiation energy of ${\sim }10^{34}$ erg, making it the first stellar flare ever observed with an X-ray microcalorimeter spectrometer. The flare peak count rate is 6.4 times higher than that in quiescence and is distinguished clearly in time thanks to the long telescope time. Many emission lines were detected in the 1.7–10 keV range both in the flare and quiescent phases. Using the high spectral resolution of Resolve in the Fe K band (6.5–7.0 keV), we resolved the inner-shell lines of Fe xix–xxiv as well as the outer-shell lines of Fe xxv–xxvi. These lines have peaks in the contribution functions at different temperatures over a wide range, allowing us to construct the differential emission measure (DEM) distribution over the electron temperature of 1–10 keV (roughly 10–100 MK) based only on Fe lines, thus without an assumption of the elemental abundance. The reconstructed DEM has a bimodal distribution, and only the hotter component increased during the flare. The elemental abundance was derived based on the DEM distribution thus constructed. A significant abundance increase was observed during the flare for Ca and Fe, which are some of the elements with the lowest first ionization potential among those analyzed, but not for Si, S, and Ar. This behavior is seen in some giant solar flares and the present result is a clear example in stellar flares.
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Nature Astronomy, 10 144-153, Jan, 2026 Peer-reviewed
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Publications of the Astronomical Society of Japan, 77(6) 1278-1289, Dec, 2025 Peer-reviewed
Misc.
93-
日本物理学会講演概要集(CD-ROM), 79(1), 2024
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日本物理学会講演概要集(CD-ROM), 79(1), 2024
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日本物理学会講演概要集(CD-ROM), 79(2), 2024
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日本物理学会講演概要集(CD-ROM), 78(1), 2023
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日本物理学会講演概要集(CD-ROM), 78(2), 2023
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日本物理学会講演概要集(CD-ROM), 78(2), 2023
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日本物理学会講演概要集(CD-ROM), 78(2), 2023
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大気球シンポジウム: 2022年度 = Balloon Symposium: 2022, Nov, 2022大気球シンポジウム 2022年度(2022年11月7-8日. ハイブリッド開催(JAXA相模原キャンパス& オンライン)) Balloon Symposium 2022 (November 7-8, 2022. Hybrid(in-person & online) Conference (Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA)(ISAS)), Sagamihara, Kanagawa Japan 著者人数: 87名 資料番号: SA6000177030 レポート番号: isas22-sbs-030
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日本物理学会講演概要集(CD-ROM), 77(1), 2022
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日本物理学会講演概要集(CD-ROM), 77(2), 2022
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日本物理学会講演概要集(CD-ROM), 77(1), 2022
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日本物理学会講演概要集(CD-ROM), 77(2), 2022
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大気球シンポジウム: 2021年度 = Balloon Symposium: 2021, Nov, 2021大気球シンポジウム 2021年度(2021年11月1-2日. オンライン開催) Balloon Symposium 2021 (November 1-2, 2021. Online Meeting) 著者人数: 93名PDF再処理の為、2023年3月24日に差替 資料番号: SA6000166020 レポート番号: isas21-sbs-020
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日本物理学会講演概要集(CD-ROM), 76(1), 2021
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日本物理学会講演概要集(CD-ROM), 76(2), 2021
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日本物理学会講演概要集(CD-ROM), 76(2), 2021
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大気球シンポジウム: 2020年度 = Balloon Symposium: 2020, Nov, 2020大気球シンポジウム 2020年度(2020年11月5-6日. 宇宙航空研究開発機構宇宙科学研究所(JAXA)(ISAS)), 相模原市, 神奈川県 Balloon Symposium 2020 (November 5-6, 2020. Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency(JAXA)(ISAS)), Sagamihara, Kanagawa Japan 著者人数: 67名 資料番号: SA6000151012 レポート番号: isas20-sbs-012
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日本物理学会講演概要集(CD-ROM), 75(1), 2020
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日本物理学会講演概要集(CD-ROM), 75(1), 2020
Presentations
8-
Optics & Photonics Japan 2023, Nov 29, 2023 Invited
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44th COSPAR Scientific Assembly, 2022
Teaching Experience
7-
Sep, 2025 - Mar, 2026宇宙理学概論(オムニパス) (総合研究大学院大学)
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Sep, 2023 - Mar, 2024
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Apr, 2021 - Mar, 2022Space Science Review (The Graduate University for Advanced Studies)
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Oct, 2019 - Mar, 2020Space Science Review (The Graduate University for Advanced Studies)
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Oct, 2009 - Mar, 2010Applied Physics (Chuo University)
Professional Memberships
4-
Jul, 1998 - Present
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Mar, 1998 - Present
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Jan, 1997 - Present
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Aug, 1993 - Present
Research Projects
12-
Grants-in-Aid for Scientific Research, Japan Society for the Promotion of Science, Apr, 2023 - Mar, 2027
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Grants-in-Aid for Scientific Research, Japan Society for the Promotion of Science, Apr, 2022 - Mar, 2025
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Grants-in-Aid for Scientific Research, Japan Society for the Promotion of Science, Apr, 2022 - Mar, 2025
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Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A), Japan Society for the Promotion of Science, Apr, 2020 - Mar, 2023
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科学研究費助成事業 挑戦的研究(萌芽), 日本学術振興会, Jun, 2019 - Mar, 2022