Presolar grains
arXiv:2406.14694 · doi:10.1016/B978-0-323-99762-1.00129-7
Abstract
The chemical makeup of our solar system is a reflection of Galactic chemical evolution in the local interstellar medium (ISM) over the past ~9 Ga before the formation of the solar system. Although the incorporated ISM dust was mostly destroyed during the solar system formation, a small fraction of the ISM dust, known as presolar grains, is preserved in pristine extraterrestrial materials and identified through their exotic isotopic compositions, pointing to their formation in gas outflows or explosions of ancient stars. Since their stellar birth at more than 4.6 Ga, presolar grains have borne witness to a diverse array of astrophysical and cosmochemical processes. In this chapter, I will review recent progress in utilizing the isotopic and structural compositions of presolar grains to constrain physical mixing processes and dust formation in stars, stellar nucleosynthesis, ISM processes, and the origin and evolution of the solar system.
In press; Geochemistry Treatise chapter
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