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Making the Planetary Material Diversity during the Early Assembling of the Solar System

Abstract : Chondritic meteorites, the building blocks of terrestrial planets, are made of an out-of-equilibrium assemblage of solids formed at high and low temperatures, either in our Solar system or previous generations of stars. For decades this was considered to result from large-scale transport processes in the Sun's isolated accretion disk. However, mounting evidence suggests that refractory inclusions in chondrites formed contemporaneously with the disk building. Here we numerically investigate, using a 1D model and several physical and chemical processes, the formation and transport of rocky materials during the collapse of the Sun's parent cloud and the consequent assembling of the Solar Nebula. The interplay between the cloud collapse, the dynamics of gas and dust, vaporization, recondensation, and thermal processing of different species in the disk results in a local mixing of solids with different thermal histories. Moreover, our results also explain the overabundance of refractory materials far from the Sun and their short-formation timescales, during the first tens of kyr of the Sun, corresponding to class 0-I, opening new windows into the origin of the compositional diversity of chondrites.
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Francesco C Pignatale, Sébastien Charnoz, Marc Chaussidon, Emmanuel Jacquet. Making the Planetary Material Diversity during the Early Assembling of the Solar System. The Astrophysical journal letters, Bristol : IOP Publishing, 2018, 867 (2), pp.L23. ⟨10.3847/2041-8213/aaeb22⟩. ⟨insu-02900905⟩



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