Collisionless encounters and the origin of the lunar inclination

@article{Pahlevan2015CollisionlessEA,
  title={Collisionless encounters and the origin of the lunar inclination},
  author={Kaveh Pahlevan and Alessandro Morbidelli},
  journal={Nature},
  year={2015},
  volume={527},
  pages={492-494}
}
The Moon is generally thought to have formed from the debris ejected by the impact of a planet-sized object with the proto-Earth towards the end of planetary accretion. Models of the impact process predict that the lunar material was disaggregated into a circumplanetary disk and that lunar accretion subsequently placed the Moon in a near-equatorial orbit. Forward integration of the lunar orbit from this initial state predicts a modern inclination at least an order of magnitude smaller than the… Expand

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References

SHOWING 1-10 OF 33 REFERENCES
Origin of the Moon's orbital inclination from resonant disk interactions
TLDR
It is shown that the Moon's substantial orbital inclination is probably a natural result of its formation from an impact-generated disk, and involves a gravitational resonance between the Moon and accretion-disk material, which can increase orbital inclinations up to ∼15°. Expand
Origin of the Moon in a giant impact near the end of the Earth's formation
TLDR
This work reports a class of impacts that yield an iron-poor Moon, as well as the current masses and angular momentum of the Earth–Moon system, and suggests that the Moon formed near the very end of Earth's accumulation. Expand
The lunar orbit revisited, III
In this paper we present an investigation on the tidal evolution of a system of three bodies: the Earth, the Moon and the Sun. Equations are derived including dissipation in the planet caused by theExpand
LUNAR ACCRETION FROM A ROCHE-INTERIOR FLUID DISK
We use a hybrid numerical approach to simulate the formation of the Moon from an impact-generated disk, consisting of a fluid model for the disk inside the Roche limit and an N-body code to describeExpand
A low mass for Mars from Jupiter’s early gas-driven migration
TLDR
Simulation of the early Solar System shows how the inward migration of Jupiter to 1.5 au, and its subsequent outward migration, lead to a planetesimal disk truncated at 1’au; the terrestrial planets then form from this disk over the next 30–50 million years, with an Earth/Mars mass ratio consistent with observations. Expand
Satellite-Sized Planetesimals and Lunar Origin
Abstract Exploratory calculations using accretionary theory are made to demonstrate plausible sizes of second-largest, third-largest, etc., bodies at the close of planet formation in heliocentricExpand
Dynamics of Lunar Formation
▪ Abstract The giant impact theory is the leading hypothesis for the origin of the Moon. This review focuses on dynamical aspects of an impact-induced lunar formation, in particular those areas thatExpand
Lunar-forming impacts: processes and alternatives
  • R. Canup
  • Physics, Medicine
  • Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences
  • 2014
TLDR
The formation of a protolunar disc by a giant impact with the early Earth is discussed, focusing on two classes of impacts: canonical impacts and high-angular-momentum impacts, both of which require subsequent processes for consistency with the current Earth and Moon. Expand
Tidal Dissipation in the Early Lunar Magma Ocean and its Role in the Evolution of the Earth-Moon System
Dissipation in the Earth drove the Moon outwards over time. As it did so, the Moon’s obliquity increased, reaching a maximum at the socalled Cassini state transition at a distance of ~30 Earth radiiExpand
The Tethered Moon
Abstract We address the thermal history of the Earth after the Moon-forming impact, taking tidal heating and thermal blanketing by the atmosphere into account. The atmosphere sets an upper bound ofExpand
...
1
2
3
4
...