Ikuta Kai 幾田佳

Researcher Number	10964455
Other IDs
Affiliation (Current)	2026: 一橋大学, 大学院ソーシャル・データサイエンス研究科, 特任助教
Affiliation (based on the past Project Information) *help	2024 – 2025: 東京大学, 大学院総合文化研究科, 特任研究員
Review Section/Research Field	Principal Investigator Basic Section 16010:Astronomy-related Except Principal Investigator Medium-sized Section 16:Astronomy and related fields
Keywords	Principal Investigator 連続最適化 / ベイズ最適化 / 天文データ科学 / 太陽型星 / 恒星スーパーフレア / 恒星大気 / 恒星磁場 / 恒星磁気活動 Except Principal Investigator 質量放出 / スーパーフレア / 黒点 / 分光器開発 / 恒星磁気活動性

Unified Understanding of Stellar Superflares from Onset to Consequences by Observation
- Principal Investigator
  
  野上大作
- Project Period (FY)
  2024 – 2026
- Research Category
  
  Grant-in-Aid for Scientific Research (A)
- Review Section
  
  Medium-sized Section 16:Astronomy and related fields
- Research Institution
  Kyoto University
Exploring stellar magnetic activity from photometric and spectroscopic observations with astrostatisticsPrincipal Investigator
- Principal Investigator
  
  幾田佳
- Project Period (FY)
  2024 – 2026
- Research Category
  
  Grant-in-Aid for Early-Career Scientists
- Review Section
  
  Basic Section 16010:Astronomy-related
- Research Institution
  The University of Tokyo

All 2025 2024

All Journal Article Presentation

[Journal Article] TOI-5108 b and TOI 5786 b: Two transiting sub-Saturns detected and characterized with TESS, MaHPS, and SOPHIE2025
- Author(s)
  Thomas, L., ..., Ikuta, K. et al.
- Journal Title
  
  Astronomy & Astrophysics
  
  Volume: 694 Pages: A143-A143
- DOI
  10.1051/0004-6361/202451676
- Peer Reviewed / Open Access / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-24K17082
[Journal Article] TOI-2015 b: A sub-Neptune in strong gravitational interaction with an outer non-transiting planet2025
- Author(s)
  Barkaoui K.、Korth J.、Gaidos E.、Agol E.、Parviainen H.、Pozuelos F. J.、Palle E.、Narita N.、Grimm S.、Brady M.、Bean J. L.、Morello G.、Rackham B.V.、Burgasser A. J.、Isogai K.、et al.
- Journal Title
  
  Astronomy & Astrophysics
  
  Volume: 695 Pages: A281-A281
- DOI
  10.1051/0004-6361/202452916
- Peer Reviewed / Open Access / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-20K14521, KAKENHI-PROJECT-24K00689, KAKENHI-PROJECT-24K17082, KAKENHI-PROJECT-24KJ0241
[Journal Article] TOI-1408: Discovery and Photodynamical Modeling of a Small Inner Companion to a Hot Jupiter Revealed by Transit Timing Variations2024
- Author(s)
  Korth Judith、Chaturvedi Priyanka、Parviainen Hannu、et al.
- Journal Title
  
  The Astrophysical Journal Letters
  
  Volume: 971 Issue: 2 Pages: L28-L28
- DOI
  10.3847/2041-8213/ad65fd
- Peer Reviewed / Open Access / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-24K00689, KAKENHI-PROJECT-24K17082
[Journal Article] Sun-as-a-star Analysis of the X1.6 Flare on 2023 August 5: Dynamics of Postflare Loops in Spatially Integrated Observational Data2024
- Author(s)
  Otsu Takato、Asai Ayumi、Ikuta Kai、Shibata Kazunari
- Journal Title
  
  The Astrophysical Journal Letters
  
  Volume: 974 Issue: 1 Pages: L13-L13
- DOI
  10.3847/2041-8213/ad7a70
- Peer Reviewed / Open Access
- Data Source
  KAKENHI-PROJECT-24K07093, KAKENHI-PROJECT-24K17082
[Journal Article] Multiwavelength Campaign Observations of a Young Solar-type Star, EK Draconis. II. Understanding Prominence Eruption through Data-driven Modeling and Observed Magnetic Environment2024
- Author(s)
  K. Namekata, K. Shibata, et al.
- Journal Title
  
  The Astrophysical Journal
  
  Volume: 976 Issue: 2 Pages: 255-255
- DOI
  10.3847/1538-4357/ad85df
- Peer Reviewed / Open Access / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-21H01131, KAKENHI-PROJECT-24K00680, KAKENHI-PROJECT-24K00685, KAKENHI-PROJECT-24K17082, KAKENHI-PROJECT-24KJ1483
[Presentation] Mapping stellar surface for solar-type star2025
- Author(s)
  Ikuta, K., Namekata, K., Maehara, H., Airapetian, V., Petit, P., Notsu, Y., Nogami, D., Shibata, K., EK Dra collaboration
- Organizer
  Cool Stars Workshop in Japan
- Data Source
  KAKENHI-PROJECT-24K17082
[Presentation] スパースモデリングによる太陽型星表面の動的マッピング2025
- Author(s)
  幾田佳
- Organizer
  日本天文学会2025年春季年会
- Data Source
  KAKENHI-PROJECT-24K17082
[Presentation] Starspot mapping and multiwavelength variability for a young solar-type star2024
- Author(s)
  Ikuta, K., Namekata, K., Maehara, H., Airapetian, V., Petit, P., Notsu, Y., Shibata, K.
- Organizer
  TESS Science Conference III
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-24K17082
[Presentation] Simple model for filament and prominence eruptions from superflares on a young solar-type star2024
- Author(s)
  Ikuta, K., Otsu, T., Asai, A., Namekata, K., Shibata, K.
- Organizer
  Cool Stars 22
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-24K17082
[Presentation] Mapping stellar surface and exploring multiwavelength variability for a young solar-type star2024
- Author(s)
  Ikuta, K., Namekata, K., Maehara, H., Airapetian, V., Petit, P., Notsu, Y., Shibata, K.
- Organizer
  Data Oriented Astronomy 2024
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-24K17082
[Presentation] 若い太陽型星における黒点の多波長観測とその展開2024
- Author(s)
  幾田佳, 行方宏介, 前原裕之, Vladimir Airapetian, Pascal Petit, 野津湧太, 柴田一成, 李尚姫, 梶木屋裕斗, 佐藤文衛, 本田敏志, 野上大作
- Organizer
  2024年度せいめいユーザーズミーティング
- Data Source
  KAKENHI-PROJECT-24K17082
[Presentation] Discovery of a short-period sub-Neptune and an outer planetary companion around a mid M-dwarf2024
- Author(s)
  Ikuta, K., Narita, N., Takarada, T., Hirano, T., Fukui, A., Ishikawa, H. T., Kimura, T., Kodama, T., Hori, Y., Ikoma, M., Kotani, T., Tamura, M., IRD intensive and instrument teams, MuSCAT team
- Organizer
  TESS Science Conference III
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-24K17082
[Presentation] 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2024
- Author(s)
  幾田佳, 大津天斗, 浅井歩, 行方宏介, 柴田一成
- Organizer
  日本天文学会2024年秋季年会
- Data Source
  KAKENHI-PROJECT-24K17082

1. 野上大作 (20332728)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
2. 岩室史英 (80281088)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
3. 前原裕之 (40456851)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
4. 本田敏志 (20425408)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
5. 行方宏介 (30987524)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
6. 浅井歩

# of Collaborated Projects: 0 results

# of Collaborated Products: 1 results
7. 磯貝桂介

# of Collaborated Projects: 0 results

# of Collaborated Products: 1 results
8. 柴田一成

# of Collaborated Projects: 0 results

# of Collaborated Products: 1 results

Ikuta Kai 幾田 佳

Research Projects

Research Products

Co-Researchers

Unified Understanding of Stellar Superflares from Onset to Consequences by Observation

Principal Investigator

Project Period (FY)

Research Category

Review Section

Research Institution

Exploring stellar magnetic activity from photometric and spectroscopic observations with astrostatisticsPrincipal Investigator

Principal Investigator

Project Period (FY)

Research Category

Review Section

Research Institution

[Journal Article] TOI-5108 b and TOI 5786 b: Two transiting sub-Saturns detected and characterized with TESS, MaHPS, and SOPHIE2025

Author(s)

Journal Title

DOI

Data Source

[Journal Article] TOI-2015 b: A sub-Neptune in strong gravitational interaction with an outer non-transiting planet2025

Author(s)

Journal Title

DOI

Data Source

[Journal Article] TOI-1408: Discovery and Photodynamical Modeling of a Small Inner Companion to a Hot Jupiter Revealed by Transit Timing Variations2024

Author(s)

Journal Title

DOI

Data Source

[Journal Article] Sun-as-a-star Analysis of the X1.6 Flare on 2023 August 5: Dynamics of Postflare Loops in Spatially Integrated Observational Data2024

Author(s)

Journal Title

DOI

Data Source

[Journal Article] Multiwavelength Campaign Observations of a Young Solar-type Star, EK Draconis. II. Understanding Prominence Eruption through Data-driven Modeling and Observed Magnetic Environment2024

Author(s)

Journal Title

DOI

Data Source

[Presentation] Mapping stellar surface for solar-type star2025

Author(s)

Organizer

Data Source

[Presentation] スパースモデリングによる太陽型星表面の動的マッピング2025

Author(s)

Organizer

Data Source

[Presentation] Starspot mapping and multiwavelength variability for a young solar-type star2024

Author(s)

Organizer

Data Source

[Presentation] Simple model for filament and prominence eruptions from superflares on a young solar-type star2024

Author(s)

Organizer

Data Source

[Presentation] Mapping stellar surface and exploring multiwavelength variability for a young solar-type star2024

Author(s)

Organizer

Data Source

[Presentation] 若い太陽型星における黒点の多波長観測とその展開2024

Author(s)

Organizer

Data Source

[Presentation] Discovery of a short-period sub-Neptune and an outer planetary companion around a mid M-dwarf2024

Author(s)

Organizer

Data Source

[Presentation] 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2024

Author(s)

Organizer

Data Source

Ikuta Kai 幾田佳