Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Hypothetical hyperbolic encounters between Venus and proto-Mercury that
  partially \ stripped away proto-Mercury's mantle   Mercury has an unusually large metal core comprising ~70% of its mass
comparing to all other terrestrial planets in the solar system. Giant impacts
can remove a significant fraction of the silicate mantle of a chondritic
proto-Mercury and form the iron rich present-day Mercury. However, such
high-temperature giant impacts seem at odds with the retainment of moderately
volatile elements on present-day Mercury (Peplowski et al. 2011). We simulated
a series of hyperbolic encounters between proto-Mercury and proto-Venus, which
may occur in the chaotic early solar system. Tidal disruption of proto-Mercury
always removes part of its silicate mantle while its iron core remains intact.
We find, in favourable cases, four close encounters with fast spinning
projectiles (resulting from previous encounters) can lead to present-day
Mercury iron fraction. More encounters are needed when the spin and orbital
angular momentum are not always aligned. These hyperbolic encounters have
various outcomes, such as orbital decay, binary planets and change of spin
rates. These results suggest the importance of proper treatment of close
encounters in N-body simulations of planetary accretion.

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The categories of this paper are: comp-gas
3
The categories of this paper are: physics
0
The categories of this paper are: hep-ph
20
The categories of this paper are: acc-phys
13
The categories of this paper are: quant-ph
29
The categories of this paper are: funct-an
12
The categories of this paper are: nucl-th
30
The categories of this paper are: q-alg
35
The categories of this paper are: mtrl-th
7
The categories of this paper are: hep-th
2
The categories of this paper are: math
36
The categories of this paper are: cmp-lg
37
The categories of this paper are: supr-con
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The categories of this paper are: nlin
5
The categories of this paper are: gr-qc
31
The categories of this paper are: ao-sci