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Collisional fragmentation is shown to not be a barrier to rocky planetformation at small distances from the host star. Simple analytic argumentsdemonstrate that rocky planet formation via collisions of homogeneousgravity-dominated bodies is possible down to distances of order the Rocheradius ($r_\mathrm{Roche}$). Extensive N-body simulations with initial bodies${\gtrsim}1700$ km that include plausible models for fragmentation and mergingof gravity-dominated bodies confirm this conclusion and demonstrate that rockyplanet formation is possible down to ${\sim}$1.1 $r_\mathrm{Roche}$. At smallerdistances, tidal effects cause collisions to be too fragmenting to allow massbuild-up to a final, dynamically stable planetary system. We argue that evendifferentiated bodies can accumulate to form planets at distances that are notmuch larger than $r_\mathrm{Roche}$.

Collisional Fragmentation is Not a Barrier to Close-in Planet Formation