Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Did Earth eat its leftovers? Impact ejecta as a component of the late
  veneer   The presence of highly siderophile elements in Earth's mantle indicates that
a small percentage of Earth's mass was delivered after the last giant impact in
a stage of 'late accretion.' There is ongoing debate about the nature of
late-accreted material and the sizes of late-accreted bodies. Earth appears
isotopically most similar to enstatite chondrites and achondrites. It has been
suggested that late accretion must have been dominated by enstatite-like bodies
that originated in the inner disk, rather than ordinary or carbonaceous
chondrites. Here, we examine the provenances of 'leftover' planetesimals
present in the inner disk in the late stages of accretion simulations.
Dynamically excited planet formation produces planets and embryos with similar
provenances, suggesting that the Moon-forming impactor may have had a stable
isotope composition very similar to the proto-Earth. Commonly, some
planetesimal-sized bodies with similar provenances to the Earth-like planets
are left at the end of the main stage of growth. The most chemically-similar
planetesimals are typically fragments of proto-planets ejected millions of
years earlier. If these similar-provenance bodies are later accreted by the
planet, they will represent late-accreted mass that naturally matches Earth's
composition. The planetesimal-sized bodies that exist during the giant impact
phase can have large core mass fractions, with core provenances similar to the
proto-Earth. These bodies are an important potential source for highly
siderophile elements. The range of core fractions in leftover planetesimals
complicates simple inferences as to the mass and origin of late accretion based
on the highly siderophile elements in the mantle.

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The categories of this paper are: nucl-th
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The categories of this paper are: math
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The categories of this paper are: adap-org
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The categories of this paper are: physics
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The categories of this paper are: hep-th
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The categories of this paper are: mtrl-th
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The categories of this paper are: ao-sci
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The categories of this paper are: eess
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The categories of this paper are: acc-phys
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The categories of this paper are: chem-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: hep-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: atom-ph
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The categories of this paper are: nlin
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The categories of this paper are: stat