Sachiko Amari

Sachiko Amari serves as a Research Professor of Physics in the Department of Physics at Washington University in St. Louis, where she conducts pioneering research in cosmochemistry through the McDonnell Center for the Space Sciences. Her work bridges laboratory astrophysics and planetary science, focusing on extraterrestrial materials to unravel solar system formation and stellar processes.

Amari's educational foundation includes a PhD from Kobe University and both Master of Engineering and Bachelor of Engineering degrees from Waseda University in Japan. This engineering background informs her precise analytical approach to meteoritic materials.

Her research centers on presolar grains—stardust formed in stellar outflows that were incorporated into primitive meteorites. Using secondary ion mass spectrometry, she analyzes isotopic ratios to investigate nucleosynthesis in stars, mixing processes in stellar ejecta, and Galactic chemical evolution. A secondary focus examines noble gas trapping mechanisms in meteorites to understand volatile origins and early solar system processes. Her work reveals how microscopic grains preserve macroscopic cosmic histories.

Analysis of her recent publications shows consistent emphasis on silicon carbide and graphite presolar grains, with increasing technical sophistication in NanoSIMS analysis. Research trends include correlating multi-element isotopic systems, identifying rare stellar sources like novae, and resolving phase Q—the elusive noble gas carrier in meteorites. Her work demonstrates how laboratory studies of individual grains constrain astrophysical models.

Amari leads an active research group within the McDonnell Center for the Space Sciences and collaborates on major initiatives including the Mars Sample Return Science Definition Team. She mentors graduate students in meteoritics research while developing analytical protocols for extraterrestrial material characterization. Her laboratory serves as a hub for stardust analysis, utilizing advanced mass spectrometry techniques to decode isotopic fingerprints of stellar processes.