A Comparison of Smooth-Disk and Clumpy-Disk Models of Terrestrial Planet Formation

We compare the bulk properties of the terrestrial planets that form from two different models: smooth-disk models in which the mass distribution of the embryos follows a simple mathematical function, and "clumpy-disk" models which include depletion zones.  Both models are solar-system analogs that include Jupiter and Saturn in their present orbits.  Clumpy-disk models produce slightly more planets on average (3.5 vs. 3.8) and a slightly greater range in the number of planets formed (up to 7 vs. 10).  Both models are equally efficient at ~40%, though the range of efficiencies is slightly greater for the clumpy-disk models.  We will compare additional bulk properties, such as accretion rates and the time of formation for planets, but, overall, the models do not differ significantly from one another with regard to their bulk properties.  The details of how individual planets form, however, vary across the two models, and we will describe the role of depletion zones in the formation of Mars-analogs.