Sohei WADA

Papers

1. Kawasaki N., Yamamoto D., Wada S., Park C., Kim H., Sakamoto N., and Yurimoto H. (2024) "²⁶Al–²⁶Mg chronology of high-temperature condensate hibonite in a fine-grained, Ca-Al-rich inclusion from reduced CV chondrite" Meteoritics & Planetary Science, 59, 630–639.
2. Kita. N, ... Wada S., ... Yurimoto H. (2024) "Disequilibrium oxygen isotope distribution among aqueously altered minerals in Ryugu asteroid returned samples" Meteoritics & Planetary Science, In press
3. Hu. Y, ... Wada S., ... Yurimoto H. (2024) "Pervasive aqueous alteration in the early Solar System revealed by potassium isotopic variations in Ryugu samples and carbonaceous chondrites" Icarus, 409, 115884.
4. Morita. M, ... Wada S., ... Yurimoto H. (2024) "Analysis of Cation Composition in Dolomites on the Intact Particles Sampled from Asteroid Ryugu" Analytical Chemistry, 96, 170–178.
5. Aléon, J., ... Wada S., ... Yurimoto H. (2024) "Hydrogen in magnetite from asteroid Ryugu" Meteoritics and Planetary Science, in press (Open access)
6. Bizzarro, M., ... Wada S., ... Yurimoto H. (2023) "The Magnesium Isotope Composition of Samples Returned from Asteroid Ryugu" Astrophysical Journal Letters, 958, L25. (Open access)
7. Yokoyama, T., ... Wada S., ... Yurimoto H. (2023) "Water circulation in Ryugu asteroid affected the distribution of nucleosynthetic isotope anomalies in returned sample" Science Advances, 9, eadi7048. (Open access)
8. Tang, H., ... Wada S., ... Yurimoto H. (2023) "The Oxygen Isotopic Composition of Samples Returned from Asteroid Ryugu with Implications for the Nature of the Parent Planetesimal" The Planetary Science Journal, 4, acea62. (Open access)
9. Nguyen, A.N., ... Wada S., ... Yurimoto H. (2023) "Abundant presolar grains and primordial organics preserved in carbon-rich exogenous clasts in asteroid Ryugu" Science Advances, 9, eadh1003. (Open access)
10. Fujiya, W., Kawasaki, N., Nagashima, K., ... Wada S., ... Yurimoto H. (2023) "Carbonate record of temporal change in oxygen fugacity and gaseous species in asteroid Ryugu" Nature Geoscience, 16, 675–682.
11. Piani, L., ... Wada S., ... Yurimoto H. et al. (2023) "Hydrogen Isotopic Composition of Hydrous Minerals in Asteroid Ryugu" The Astrophysical Journal Letters, 946, L43. (Open access)
12. Paquet M., ... Wada S., ... Yurimoto H. et al. (2022) "Contribution of Ryugu-like material to Earth’s volatile inventory by Cu and Zn isotopic analysis" Nature Astronomy, 7, 182–189.
13. Kawasaki N., ... Wada S., ... Yurimoto H. et al. (2022) "Oxygen isotopes of anhydrous primary minerals show kinship between asteroid Ryugu and comet 81P/Wild2" Science Advances, 8, eade206. (Open access)
14. Moynier, F., ... Wada S., ... Yurimoto H. et al. (2022) "Solar System calcium isotopic composition inferred from Ryugu samples" Geochemical Perspectives Letters, 24, 1–6. (Open access)
15. Hopp T., ... Wada S., ... Yurimoto H. et al. (2022) "Ryugu’s nucleosynthetic heritage from the outskirts of the Solar System" Science Advances, 8, eadd8141. (Open access)
16. Barosch J., ... Wada S., ... Yurimoto H. et al. (2022) "Presolar Stardust in Asteroid Ryugu" The Astrophysical Journal Letters, 935, L3. (Open access)
17. Yokoyama T., Nagashima K., ... Wada S., ... Yurimoto H. et al. (2022) “Samples returned from the asteroid Ryugu are similar to Ivuna-type carbonaceous meteorites” Science. (Open access)
18. Wada S., Kawasaki N., Park C., and Yurimoto H. (2020) “Melilite condensed from an ¹⁶O-poor gaseous reservoir: Evidence from a fine-grained Ca-Al-rich inclusion of Northwest Africa 8613” Geochimica et Cosmochimica Acta, 288, 161–175. (Open access)
19. Kawasaki N., Wada S., Park C., Sakamoto N. and Yurimoto H. (2020) “Variations in initial ²⁶Al/²⁷Al ratios among fine-grained Ca-Al-rich inclusions from reduced CV chondrites” Geochimica et Cosmochimica Acta, 279, 1–15. (Full-text available on ResearchGate)

International Conference

Oral presentation

1. Wada S., Bajo K. and Yurimoto H., Evidence of Solar Wind Irradiation on Regolith of a Gas-rich Carbonaceous Chondrite, Solar-System symposium in Sapporo, Sapporo, Hokkaido, Japan, February 15, 2024.
2. Wada S., Bajo K. and Yurimoto H., Imaging of solar wind helium in the Fe-Ni metal and metal hydroxide from Northwest Africa 801, JpGU Meeting 2023, PPS08-12, Makuhari Messe, Chiba, Japan, May 26, 2023.
3. Kawasaki N., Yamamoto D., Wada S., Park C., Kim H., Sakamoto N. and Yurimoto H., Al-Mg chronology of high-temperature condensate minerals in a fine-grained, Ca-Al-rich inclusion from CV chondrite, Solar-System symposium in Sapporo, Sapporo, Hokkaido, Japan, February 15, 2023.
4. Wada S., Bajo K. and Yurimoto H., Imaging of solar wind helium in the Fe-Ni metal and metal hydroxide from Northwest Africa 801, Solar-System symposium in Sapporo, Sapporo, Hokkaido, Japan, February 14, 2023.
5. Wada S., Bajo K. and Yurimoto H., Visualization of Sedimentary Structure in Chondrite by 2-D Helium Imaging, The 85th Annual Meeting of the Meteoritical Society, #6461, Glasgow, UK, August 16, 2022.
6. Wada S., Bajo K. and Yurimoto H., Host mineral phases of solar wind helium and their occurrence in Northwest Africa 801 meteorite, JpGU Meeting 2022, PPS08-10, Makuhari Messe, Chiba, Japan, May 27, 2022.
7. Wada S., Kawasaki N. and Yurimoto H., Evidence for an ¹⁶O-poor gaseous reservoir during formation of a fine-grained CAI from Northwest Africa 8613, JpGU Meeting 2020, Online meeting, July 12, 2020.
8. Wada S., Kawasaki N. and Yurimoto H., Evidence for an ¹⁶O-poor gaseous reservoir during formation of a fine-grained CAI from Northwest Africa 8613, Solar-System symposium in Sapporo, Sapporo, Hokkaido, Japan, February 19, 2020.
9. Wada S., Kawasaki N. and Yurimoto H., Oxygen and Al-Mg Isotope Systematics of a Hibonite-Melilite-Rich Fine-Grained CAI in the Reduced CV Chondrite Northwest Africa 8613, The 82nd Annual Meeting of the Meteoritical Society, #6028, Sapporo, Hokkaido, Japan, July 11, 2019.
10. Wada S., Kawasaki N. and Yurimoto H., Oxygen and Al–Mg isotope systematics of a hibonite-melilite-rich fine-grained CAI in the reduced CV chondrite NWA 8613, Solar-System symposium in Sapporo, Sapporo, Hokkaido, Japan, February 20, 2019.

Poster presentation

1. Kawasaki N., Nagashima K., Sakamoto N., Bajo K., Wada S., The Hayabusa2-initial-analysis chemistry team, The Hayabusa2-initial-analysis core and Yurimoto H., Oxygen isotopic compositions of olivine, low-Ca pyroxene and spinel in the Hayabusa-2 returned sample from Ryugu, JpGU Meeting 2022, PPS08-P03, Makuhari Messe, Chiba, Japan, June 3, 2022.
2. Wada S., Kawasaki N. and Yurimoto H., O and Al-Mg isotope systematics of a hibonite-melilite-rich fine-grained CAI in the reduced CV chondrite NWA8613, JpGU Meeting 2019, PPS07-P05, Makuhari Messe, Chiba, Japan, May 27, 2019.

Domestic Conference

Oral presentation

1. 和⽥壮平，馬上謙一，圦本尚義，Northwest Africa 801隕石に含まれる金属鉄と水酸化鉄粒子の太陽風ヘリウムイメージング．惑星物質科学のフロンティア, 2023年3月2日, 千葉県柏市（東京大学宇宙線研究所）
2. 和⽥壮平，馬上謙一，圦本尚義，ヘリウム広領域イメージング法によるNorthwest Africa 801隕石中の太陽風ヘリウム分布の解明．日本地球化学会年会, PR0095, 2022年9月9日, 高知県高知市（高知大学）
3. 和⽥壮平，馬上謙一，圦本尚義，フェムト秒レーザーを用いたポストイオン化SNMSによるヘリウム広領域イメージング法の開発．日本地球化学会年会, PR0100, 2021年9月6日, Online meeting
4. 和⽥壮平，川﨑教⾏，圦本尚義，NWA 8613隕石中のヒボナイトとメリライトに富む細粒難揮発性包有物の酸素同位体分布．日本地球化学会年会, 3A13, 2019年9月19日, 東京都文京区（東京大学）

Poster presentation

1. 和⽥壮平，川﨑教⾏，圦本尚義，NWA 8613隕石中の細粒CAIの局所酸素・マグネシウム同位体分析．日本質量分析学会同位体比部会, 2019年11月6日, 登別温泉, 北海道

Awards

1. Student Travel Support, Japan Geoscience Union Meeting 2022, Chiba, Japan, May 22-27, 2022.
2. 日本学生支援機構 第一種奨学金 特に優れた業績による奨学金返還全額免除, 2021年6月
3. 理学院優秀研究奨励賞（北海道大学 大学院理学院）, 2021年4月
4. 修士論文最優秀発表賞（北海道大学 大学院理学院 自然史科学専攻 地球惑星システム科学分野）, 2021年2月5日
5. 修士論文院生会賞（北海道大学 大学院理学院 自然史科学専攻 地球惑星システム科学分野）, 2021年2月5日
6. 最優秀ポスター発表賞, 日本質量分析学会同位体比部会, 2019年11月6日, 登別温泉, 北海道
7. 学生奨励賞（口頭発表），日本地球化学会年会, 3A13，2019年9月19日, 東京都文京区（東京大学）
8. Japan Aerospace Exploration Agency (JAXA) and Institute of Space and Astronautical Science (ISAS) Student Travel Awards, The 82nd Annual Meeting of the Meteoritical Society, #6028, Sapporo, Hokkaido, Japan, July 7-12, 2019.

Progress Seminar 🔒

18. April. 2023 Progress seminar

23. December. 2022 Progress seminar

14. October. 2022 Progress seminar

1. July. 2022 Progress seminar

21. April. 2022 Progress seminar

17. December. 2021 Progress seminar

17. December. 2021 Progress seminar

22. October. 2021 Progress seminar

11. June. 2021 Progress seminar

15. April. 2021 Progress seminar

09. April. 2021 Progress seminar

15. January. 2021 Progress seminar

13. November. 2020 Progress seminar

08. May. 2020 Progress seminar

10. April. 2020 Progress seminar

17. January. 2020 Progress seminar

31. October. 2019 Progress seminar

14. June. 2019 Progress seminar

26. April. 2019 Progress seminar

11. January. 2019 Progress seminar

16. November. 2018 Progress seminar

05. October. 2018 Mid-term report

Text Seminar 🔒

Murer et al. (1997) Helium, neon, and argon abundances in the solar wind: In vacuo etching of meteoritic iron-nickel. 4. November. 2022 Text seminar

Bischoff et al. (1983) Lithification of gas-rich chondrite regolith breccias by grain boundary and localized shock melting. 17. June. 2022 Text seminar

Nakanishi et al. (2021) Geochemical constraints on the formation of chondrules: Implication from Os and Fe isotopes and HSE abundances in metals from CR chondrites. 26. November. 2021 Text seminar

Beyersdorf-Kuis et al. (2015) Early cosmic ray irradiation of chondrules and prolonged accretion of primitive meteorites22. April. 2021 Text seminar

Okazaki et al. (2001) Noble-gas-rich chondrules in an enstatite meteorite. 02. October. 2020 Text seminar

Wieler et al. (1989) Exposure history of the regolithic chondrite Fayetteville: I. Solar-gas-rich matrix19. June. 2020 Text seminar

Tu-Han Luu et al. (2015) Short time interval for condensation of high-temperature silicates in the solar accretion disk. 05. April. 2019 Text seminar

Katayama et al. (2012) Oxygen isotopic zoning of reversely zoned melilite crystals in a fluffy type A Ca-Al-rich inclusions from the Vigarano meteorite. 14. December. 2018 Text seminar

Park et al. (2012) Oxygen isotopic composition of the solar nebula gas inferred from high-precision isotope imaging of melilite crystals in an Allende CAI. 01. June. 2018 Text seminar