October 2024 - present, Tenure Track Assistant Professor at Department of Astronomy, Graduate School of Science, Kyoto University, Japan
April 2024 - September 2024, Assistant Professor (fixed-term) at Frontier Research Institute for Interdisciplinary Sciences and Department of Geophysics, Tohoku University, Japan (Mentor: Prof. Naoki Terada)
October 2023 - March 2024, Specially Appointed Assistant Professor at Institute of Space and Astronautical Science (ISAS), Japan Aerospace Exploration Agency (JAXA), Japan (Supervisor: Prof. Hajime Kawahara)
October 2020 - September 2023, Special Postdoctoral Researcher at RIKEN, Japan (Host Researcher: Prof. Nami Sakai)
October 2018 - September 2020, Research Scientist C at SRON Netherlands Institute for Space Research, The Netherlands (Supervisor: Prof. Michiel Min)
April 2018 - September 2018, Postdoctoral Researcher at Earth-Life Science Institute (ELSI), Tokyo Institute of Technology, Japan (Supervisors: Prof. Shigeru Ida and Prof. Yuka Fujii)
April 2015 - March 2018, JSPS Research Fellow (DC1)/FMSP (Leading Graduate Course for Frontiers of Mathematical Sciences and Physics) course student
September 2021 - March 2024, Part-time Lecturer at Kanagawa University, Japan (Omnibus lectures "General Astrophysics" and "Physical Science")
March 2018, Ph. D. Degree from the University of Tokyo, Japan
Supervisor: Prof. Masahiro Ikoma
Thesis title: “Theoretical modeling of transmission spectra of exoplanet atmospheres with hydrocarbon haze and applications to multi-wavelength transit observations”
March 2015, Master’s Degree from the University of Tokyo, Japan
Supervisor: Prof. Masahiro Ikoma
Thesis title: “Transmission spectrum models of exoplanet atmospheres with haze: Toward understanding the atmospheric composition and origin”
March 2013, Bachelor’s Degree from the University of Tokyo, Japan
June 2024 - September 2024, TI-FRIS fellow (Mentors: Prof. Naoki Terada and Prof. Michiel Min)
June - July 2016, Student Fellow of 2016 Kavli Summer Program in Astrophysics 2016: Exoplanetary Atmospheres
March 2015, Research Encouragement Award (Master), School of Science, The University of Tokyo
April 2025 - March 2028, Grant-in-Aid for Early-Career Scientists, 25K17429 "褐色矮星の系統的な高分散スペクトル解析から確立する系外惑星大気の特徴付け", 3,800,000 JPY, PI
April 2023 - March 2026, Grant-in-Aid for Scientific Research (B), 23H01224 "惑星大気を模した高温水素ガス下での分子線実測に基づく系外惑星探査", 15,300,000 JPY in total, Co-I (450,000 JPY to Y. Kawashima)
June 2022 – March 2027, Grant-in-Aid for Transformative Research Areas (A), 22H05150 "理論班：惑星CO環境のモデリング (Theoretical group: modeling of the planetary CO environment)", 180,700,000 JPY in total, Co-I (8,850,000 JPY to Y. Kawashima)
July 2021 – March 2023 (the program lasts until March 2026), Grant-in-Aid for Scientific Research (S), 21H04998 "Mapping Habitable Planetary Environments with Exoplanet Imaging”, 183,820,000 JPY in total, Co-I (3,200,000 JPY to Y. Kawashima)
April 2021 - March 2024, Grant-in-Aid for Early-Career Scientists, 21K13984 "原始惑星系円盤の化学・物理進化計算と系外惑星大気の観測から探る惑星形成過程", 3,500,000 JPY, PI
April 2015 - March 2018, Grant-in-Aid for JSPS Fellows, 15J08463 "ヘイズの存在可能性を考慮した短周期系外惑星の大気組成の解明", 2,800,000 JPY, PI
June 2024 - September 2024, Start-up fund for TI-FRIS fellow, 1st-year funding of 800,000 JPY (discontinued for the 2nd year due to my transfer)
June 2024 - September 2024, International Collaborative Research fund for TI-FRIS fellow, 1st-year funding of 800,000 JPY (discontinued for the 2nd-5th years due to my transfer)
April 2024 - September 2024, Research fund from Frontier Research Institute for Interdisciplinary Sciences, 1st-year funding of 2,500,000 JPY (discontinued for the 2nd-5th years due to my transfer)
October 2020 - September 2023, RIKEN Special Postdoctoral Researcher Research budget, 3,000,000 JPY in total (1,000,000 JPY per year)
March 2019, Leids Kerkhoven-Bosscha Fonds (600 EUR)
Nature Astronomy
The Astrophysical Journal Letters
The Astrophysical Journal
The Astronomical Journal
The Planetary Science Journal
Astronomy & Astrophysics
Icarus
遊星人
HST
OPTICON-TAC
Convener of the Japan Geoscience Union Meeting 2023 (P-EM11), 2024 (P-CG19), and 2025 (P-AE18) “Exoplanets”
Convener of the Goldschmidt 2023 1f "Exoplanet atmospheric characterization, interior-surface-atmosphere interactions, and planetary habitability"
SOC of the COSPAR 2022 44th Scientific Assembly, COSPAR-22-B6.1 “Exoplanet Detection and Characterisation: Current Research, Future Opportunities and the Search for Life outside the Solar System”
Y. Kawashima, K. Kawauchi et al., "GAOES-RVによるホットジュピターの系統的な大気構造の調査に向けて：ベンチマーク惑星を用いたNa I D線のパイロット観測", Seimei/GAOES-RV (5 nights), 25B-K-0033
Y. Kawashima, M. Kuzuhara et al., "直接撮像で発見された惑星・褐色矮星の力学的質量測定：詳細な特徴付けに向けて", Seimei/GAOES-RV (2.5 nights), 25B-K-0034
Y. Kawashima, M. Kuzuhara et al., "直接撮像で発見された惑星・褐色矮星の力学的質量測定：詳細な特徴付けに向けて", Seimei/GAOES-RV (3 nights), 25A-K-0032
Y. Kawashima et al., "High-precision, high-resolution spectroscopy of a benchmark brown dwarf", Subaru/IRD+NGS-AO (0.5 night), S24B-123
Y. Kawashima, K. Masuda et al., "Chemical & Kinematic Characterization of Benchmark Brown Dwarfs with IRD", Subaru/IRD+NGS-AO & REACH+NGS-AO (2.0 nights, 1.0 night of which additionally allocated), S21A-091
Y. Kawashima et al., "Exploring Nitrogen, Sulfur, and Carbon Chemistry of a Late-T Dwarf", Subaru/IRD (0.5 night), S20B-105 (additionally allocated)
Y. Kawashima et al., "Exploring Methane-Haze Photochemistry in the Atmosphere of WASP-80b", Subaru/FOCAS (1 night), S15A-109
L. Kreidberg et al., “The SPACE Program: a Sub-neptune Planetary Atmosphere Characterization Experiment”, HST (205 orbits), Cycle 30, 17192
K. Masuda et al., "Hunting Nearby Brown-dwarf Binaries with Subaru and Gaia", Subaru/IRD+NGS-AO&REACH+NGS-AO (2 nights), S22A-054
S. K. Nugroho et al., "Characterising the atmosphere of the extremely hot-Jupiter WASP-33b", Subaru/IRD+NGS-AO (2 nights), S21B-111
J. Libby-Roberts and Z. K. Berta-Thompson et al., "Unveiling the Atmospheric Composition and Haze Formation Rates in the Young, Cool, Super-Puff Kepler-51d", JWST/NIRSpec/Bright Object Time Series (20.5 hours), GO 2571
J.-M. Desert et al., "The nature, origin, and fate of two planets of a newborn system through the lens of their relative atmospheric properties", JWST/NIRSpec/Bright Object Time Series (24.6 hours), GO 2149
M. Min et al., "Mineral clouds in the atmosphere of the hot Jupiter HD189733b", JWST/MIRI/LRS (6.4 hours), GO 2001
H. Kawahara et al., "Search for C/O tracers by the First High-Dispersion Coronagraphy", Subaru/REACH+NGS-AO (2.5 nights), S21A-062
H. Kawahara et al., "Search for C/O tracers by the First High-Dispersion Coronagraphy", Subaru/IRD+SCExAO+NGS-AO (3 nights), S20B-034
L. Kreidberg et al., "Exploring the Demographics of Exo-Neptunes: Atmospheric Characterization of a Cool Sub-Neptune from TESS", HST (17 orbits), 16181
H. Kawahara et al., "Finding Methane/Ammonia in a Cloudless Warm Neptune", Subaru/IRD+NGS-AO (0.5 night), S20A-019
K. Kawauchi et al., "Detailed atmospheric investigation of cooler hot Jupiters", Subaru/HDS (2 nights), S18B-102
A. Fukui et al., "Probing the Skies of the Potentially Habitable Planets", Subaru/MOIRCS & Gemini/GMOS (0.5 + 0.5 night), S17B-120
K. Kawauchi et al., "高温のホットジュピターにおける昼夜境界層のTiO/VO検出", OAO 188cm telescope (6-8 nights), 17B-1-CN08
A. Fukui et al., "ウォームジュピターWASP-80bの大気におけるヘイズの存在確認とその特性の理解II", OAO 188cm telescope (4 nights), 16B-1-CN22
A. Fukui et al., "海王星サイズのトランジット惑星におけるレイリースロープの観測", OAO 188cm telescope (5 nights), 16A-1-CN10
T. Ryu et al., "低金属星周りのホットジュピターWASP-37bに対するトランジット観測", OAO 188cm telescope (4 nights), 15A-12
N. Narita et al., "Probing Transit Spectra of the Youngest Hot Jupiter", Subaru/FOCAS & Gemini/GMOS (1 night), S15A-073
A. Fukui et al., "Probing Molecules in the Atmosphere of Hot Uranus GJ3470b", Subaru/MOIRCS (1 night), S14B-119
N. Narita et al., "First Measurement of Mass-Loss Rate and Transmission Spectrum of CVSO30b, Subaru/MOIRCS (1 night), S14B-145
A. Fukui et al., "A Comparative Study of Atmospheres of Warm Exo-Neptunes", Subaru/MOIRCS & FOCAS (2 nights), S14A-122
N. Narita et al., "Exploring Methane-Haze Photochemistry in the Atmosphere of WASP-80b", Subaru/MOIRCS (1 night), S14A-083
K. Kawauchi et al., "Subaru-Hubble Joint Transmission Spectroscopy Low-Density Hot Jupiters II.", Subaru/HDS (1 night), S14A-171
Japan Geoscience Union, since May 2013
The Japanese Society for Planetary Sciences, since July 2013
The Astronomical Society of Japan, since 2016
ORCiD: 0000-0003-3800-7518
GitHub: ykawashima