Curriculum Vitaes
Profile Information
- Affiliation
- Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency
- ORCID ID
https://orcid.org/0000-0002-7962-4136- J-GLOBAL ID
- 202501003078234700
- researchmap Member ID
- R000092664
Research History
5-
Aug, 2025 - Present
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Feb, 2020 - Mar, 2022
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Apr, 2019 - Jan, 2020
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Apr, 2017 - Mar, 2019
Papers
84-
The Astrophysical Journal, 1002(2) 222-222, May 8, 2026Abstract We present updated hard X-ray polarization measurements of the Crab pulsar and nebula obtained with the balloon-borne polarimeter XL-Calibur in the ∼19–64 keV energy range. During the flight, intermittent failure of the Global Positioning System (GPS) receiver resulted in poorly constrained timing for ∼38% of the Crab dataset. By implementing a new phase recovery method that reconstructs timing during extended GPS-off intervals, phase tag data are recovered for ∼95% of the GPS-off dataset, increasing the precision of the phase-resolved analysis. Phase information for the data is recovered by using the Crab pulsar, with its 33 ms period, as an external timing source. Using a Markov Chain Monte Carlo framework to jointly fit phase offsets and frequency derivatives, sufficient phase accuracy is achieved across multiple periods without GPS for a phase-resolved analysis. This enables inclusion of nearly the full dataset in the polarization study. The polarization degree of the nebular emission is found to be (27.7 ± 4.9)% at a polarization angle of 127 2 ± 5 1, confirming previous XL-Calibur results and remaining aligned with the Crab’s spin axis, consistent with synchrotron emission from the inner nebula. Phase-resolved measurements show that the off-pulse and bridge intervals exhibit a strong polarization, while the pulsar peaks, although weakly constrained, remain in agreement with the softer-energy trends of IXPE. These findings reinforce a scenario in which hard X-ray emission arises primarily in the nebular torus and wind regions. The successful recovery of precise phase tagging from GPS-off data demonstrates the capacity to use the pulsar as an external clock even in the case of sparsely populated data.
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Publications of the Astronomical Society of Japan, Apr 28, 2026
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The Astrophysical Journal Letters, Apr 20, 2026
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Nature Astronomy, Mar 31, 2026
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Nature, 651(8107) 909-913, Mar 25, 2026
Misc.
35-
Meeting Abstracts of the Physical Society of Japan, 79.2 711-711, 2024
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Meeting Abstracts of the Physical Society of Japan, 79.1 529-529, 2024
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Meeting Abstracts of the Physical Society of Japan, 79.1 532-532, 2024
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Meeting Abstracts of the Physical Society of Japan, 79.1 533-533, 2024
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日本物理学会講演概要集(CD-ROM), 79(2) 675-675, 2024
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Meeting Abstracts of the Physical Society of Japan, 78.1 671-671, 2023
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Meeting Abstracts of the Physical Society of Japan, 78.1 666-666, 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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Meeting Abstracts of the Physical Society of Japan, 77.2 526-526, 2022
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日本物理学会講演概要集(CD-ROM), 77(1) 558-558, 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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Meeting Abstracts of the Physical Society of Japan, 76.2 504-504, 2021
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Meeting Abstracts of the Physical Society of Japan, 76.1 519-519, 2021
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Meeting Abstracts of the Physical Society of Japan, 76.2 508-508, 2021
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Meeting Abstracts of the Physical Society of Japan, 75.2 450-450, 2020
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Meeting Abstracts of the Physical Society of Japan, 75.1 610-610, 2020
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Meeting Abstracts of the Physical Society of Japan, 74.2 533-533, 2019
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Meeting Abstracts of the Physical Society of Japan, 73(1) 492-492, 2018
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Meeting Abstracts of the Physical Society of Japan, 71.2 374-374, 2016
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Meeting Abstracts of the Physical Society of Japan, 71(2) 372-372, 2016
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Meeting Abstracts of the Physical Society of Japan, 71(2) 373-373, 2016
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Meeting Abstracts of the Physical Society of Japan, 2015 472, 2015
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Meeting Abstracts of the Physical Society of Japan, 68.2.1 114, 2013
Presentations
104Professional Memberships
3-
Dec, 2013 - Present
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- Present
Research Projects
3-
Grants-in-Aid for Scientific Research, Japan Society for the Promotion of Science, Apr, 2021 - Mar, 2024
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科学研究費助成事業, 日本学術振興会, Apr, 2019 - Mar, 2022
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科学研究費助成事業, 日本学術振興会, Apr, 2017 - Mar, 2019