Information - SB4 Looking for Pristine Minor Bodies: Clues from Stardust and Meteoroid Studies
Event Information
First stages of planetesimal and cometesimal formation and consolidation are poorly understood despite that the models of dust grown in the protoplanetary disk have contributed to significantly constrain the coagulation process. Important theoretical and experimental progress has been made recently in the field of dust aggregation, but many questions on the formation process and the nebular processing occurred to the building blocks of planets are still open. Recent Stardust mission to comet 81P/Wild 2 has provided the first samples of cometary materials, and the study of recovered particles is particularly important for understanding the capacity of primeval objects to retain the gas, organics and ice present in the protoplanetary disk. This interdisciplinary session is devoted to develop criteria for identifying pristine objects on the basis of recent progress on their mineralogy, and physical properties (porosity, tensile strength and bulk density). Recent work suggests that the precursors of meteorites had higher microporosity than the values typically measured in chondritic meteorites. Strength and bulk density measurements of cometary meteoroids measured from meteor techniques, and values deduced from remote studies of comets suggest that some comets have been less processed by collisional compaction as well as irradiative and radiogenic heating, than chondritic asteroids. In other words, can these objects be considered representative of the first bodies born in the protoplanetary disk? Contributions related to these research fields are welcome.
Preliminary List of Solicited Speakers
Dr. Patrick Michel, Observatoire de la Cote d'Azur, Nice (France).
Dr. Adriano Campo Bagatín, Universidad de Alicante, Alicante (Spain)
Co-Sponsorship
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