Narrow-ring accretion models for terrestrial planets cannot reproduce bulk silicate Earth composition because embryos mix reduced and oxidized planetesimals early, requiring segregated reservoirs and late oxidized delivery.
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An open-source GCE code with a 100x faster solver demonstrates that refractory ratios Mg/Si and Fe/Si control carbon partitioning and atmospheric properties in water-accreting sub-Neptunes.
Coupling Bern formation models with extended chemical equilibrium including S and N shows equilibration depletes atmospheric nitrogen, shifts C/O higher outside the ice line, generates Si species, and leaves sulfur abundances weakly dependent on formation location.
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