Séminaire IPAG

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Asteroids and Comets: What these small bodies can tell us about the protosolar disk

jeudi 17 octobre 2024 - 11h00

Raphael Marschall - OCA
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Asteroids and comets are generally considered remnants of the planetesimal populations from the planet-forming era. Therefore, they should contain information about the properties of the protosolar disk and how it evolved. But, over the past years, it has become ever clearer that asteroids and comets might not be as pristine as we thought. They evolved through collisions, thermal heating and other processes since they formed 4.5 Gyr ago. To infer properties of the protoplanetary disk of our Solar System we need to understand how these small bodies were altered over time. I will discuss recent results of numerical models on the evolution of small bodies and then describe how the unaltered properties inform our understanding of the protosolar disk. Furthermore, I will describe the data from space missions (Rosetta, New Horizons, and others), ground-based surveys, and isotopic measurements of meteorites that constrain these disk and planetesimal evolution models. In particular, I will argue that our disk might have initially undergone a fast expansion phase and that we formed planetesimals in at least three distinct locations.

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