Thank you for visiting this website. I am a geo-cosmochemist. My research interest is origin & evolution of planetary surface system, especially (1) Mars: water and habitable history, (2) Asteroids: formation and collisions, and (3) early Earth environments.
In technical aspect, I mainly use secondary ion mass spectrometry (SIMS), X-ray Absorption Fine Structure (XAFS), SEM, EPMA, FIB, and noble gas mass spectrometry.
Here are Recent Research Highlights
A new research project concerning "Martian nitrogen-cycle" has started since 2021FY (JSPS Grant-in-Aid for Sicentific Research (B) -21H01149)
We have found 4-billion-year-old nitrogen-containing organic molecules from a famous Martian meteorite, ALH 84001. [Koike et al. (2020a)] [EurekAlert!] [ELSI research highlights] [MMX News (En) (日本語)] [academist Journal 研究コラム (日本語) ]
(Collaboration work) Scientific importance of Martian Moons sample return [Usui et al. (including Koike)(2020) ]
[日本語版 研究紹介ページ （作成中...) ]
Keywords: Mars, asteroids, meteorites, geochemistry, radiometric chronology, NanoSIMS, volatiles
News & Topics
2021.4: New undergraduate students have joined our lab.
2020.5: Publications and Profile (affiliation) were updated.
2020.05: Moved from ISAS, JAXA to Hiroshima University.
2018.11: Publications and Profile (affiliation) were updated.
2018.04: This site was opened.