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Dix Planetary Science Seminar

Tuesday, October 8, 2019
4:00pm to 5:00pm
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South Mudd 365
Chasing Extinct Elements and Mysterious Carriers: Isotope Constraints on Solar System Formation
Francois Tissot, Assistant Professor of Geochemistry, Geological and Planetary Sciences, Caltech,

Abstract: Calcium,Aluminum-rich inclusions (CAIs) found in primitive meteorites (chondrites) record the isotopic composition of the nascent Solar System. As a result, CAIs are a favored target when trying to understand the origin and evolution of the Solar System, including it's pre-history, the details of protoplanetary disk dynamics, and the stellar sources that contributed to the presolar molecular cloud. Here, I will discuss two recent isotopic investigations in CAIs. The first one is a wild chase looking for Curium-247, whose presence in the Early Solar System would place constraints on an old debate surrounding the number and astrophysical site of rapid-neutron capture nucleosynthesis (which forms the heaviest elements). The second one is a slow burning decomposition to identify the carriers of isotopic anomalies in CAIs, and what their identify reveals of the conditions in the early Solar System.

For more information, please contact Shreyas Vissapragada by email at