Mechanical Modification of Chondrule Fine-grained Rims by Dusty Nebular Shocks

Abstract The mechanical processes that convert an initially fluffy chondrule fine-grained rim (FGR) into a more compact structure remain poorly characterized. Given the presence of shocks in protoplanetary disks, we use numerical simulations to test hypothesis dust-laden solar nebula contributed FGR modification. We iSALE2D shock physics code model collision dusty nebular fronts (which term “dust clouds”) surfaces host porous FGR. In our simulations, dust particles are modeled as dunite disks. radii follow Mathis–Rumpl–Nordsieck distribution interstellar grains. Chondrules rectangular slabs. vary impact speed v imp , fractional abundance f cloud grains impacting shock, and pre-existing thus compute temperatures pressures resulting from collisions, well net mass accretion by FGRs. Dust increase upon impact, depending on kinetic energy . rims with higher heat up than those lower possibly important implications for composition Maximum Fine-grained can experience gain cloud, but some instances, is lost rim. find qualitative similarities topography FGR–chondrule interface between petrographic analyses Paris CM chondrite other authors.