Chondrule Oxygen Isotopes as Protoplanetary Disk Probes

This study investigates the oxygen isotopic compositions of chondrules as probes of solar protoplanetary disk formation. The research performs one-dimensional simulations of disk formation and evolution, solving a diffusion-advection equation with mass infall from the parental cloud core. The temporal evolution of oxygen isotopic compositions is computed using an experimentally derived isotope-exchange model. The study finds that the oxygen isotopic compositions of carbonaceous-chondrite chondrules can be reproduced if the radial extent of mass infall onto the disk is moderate or large, and that the observed bimodal trends in oxygen isotopic composition and redox state may reflect the partial escape of H2O vapor from chondrule-forming regions during heating. However, the model struggles to explain the oxygen isotopic compositions of ordinary-chondrite chondrules if they formed inside the snow line under background temperatures of less than 500 K. This research provides valuable insights into the formation and evolution of the solar protoplanetary disk and the conditions under which chondrules formed. The findings highlight the importance of considering the radial distribution of infalling material and the composition of the parental cloud core when modeling disk dynamics.

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