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The presence of highly siderophile elements in Earth's mantle indicates thata small percentage of Earth's mass was delivered after the last giant impact ina stage of 'late accretion.' There is ongoing debate about the nature oflate-accreted material and the sizes of late-accreted bodies. Earth appearsisotopically most similar to enstatite chondrites and achondrites. It has beensuggested that late accretion must have been dominated by enstatite-like bodiesthat originated in the inner disk, rather than ordinary or carbonaceouschondrites. Here, we examine the provenances of 'leftover' planetesimalspresent in the inner disk in the late stages of accretion simulations.Dynamically excited planet formation produces planets and embryos with similarprovenances, suggesting that the Moon-forming impactor may have had a stableisotope composition very similar to the proto-Earth. Commonly, someplanetesimal-sized bodies with similar provenances to the Earth-like planetsare left at the end of the main stage of growth. The most chemically-similarplanetesimals are typically fragments of proto-planets ejected millions ofyears earlier. If these similar-provenance bodies are later accreted by theplanet, they will represent late-accreted mass that naturally matches Earth'scomposition. The planetesimal-sized bodies that exist during the giant impactphase can have large core mass fractions, with core provenances similar to theproto-Earth. These bodies are an important potential source for highlysiderophile elements. The range of core fractions in leftover planetesimalscomplicates simple inferences as to the mass and origin of late accretion basedon the highly siderophile elements in the mantle.

Did Earth eat its leftovers? Impact ejecta as a component of the late veneer