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Title: The Origin of the Moon Within a Terrestrial Synestia

Abstract

The giant impact hypothesis remains the leading theory for lunar origin. However, current models struggle to explain the Moon’s composition and isotopic similarity with Earth. Here we present a new lunar origin model. High-energy, high-angular-momentum giant impacts can create a post-impact structure that exceeds the corotation limit, which defines the hottest thermal state and angular momentum possible for a corotating body. In a typical super-corotation-limit body, traditional definitions of mantle, atmosphere, and disk are not appropriate, and the body forms a new type of planetary structure, named a synestia. Using simulations of cooling synestias combined with dynamic, thermodynamic, and geochemical calculations, we show that satellite formation from a synestia can produce the main features of our Moon. We find that cooling drives mixing of the structure, and condensation generates moonlets that orbit within the synestia, surrounded by tens of bars of bulk silicate Earth vapor. The moonlets and growing moon are heated by the vapor until the first major element (Si) begins to vaporize and buffer the temperature. Moonlets equilibrate with bulk silicate Earth vapor at the temperature of silicate vaporization and the pressure of the structure, establishing the lunar isotopic composition and pattern of moderately volatile elements. Eventually, themore » cooling synestia recedes within the lunar orbit, terminating the main stage of lunar accretion. Our model shifts the paradigm for lunar origin from specifying a certain impact scenario to achieving a Moon-forming synestia. Giant impacts that produce potential Moon-forming synestias were common at the end of terrestrial planet formation.« less

Authors:
ORCiD logo [1]; ORCiD logo [2];  [1];  [3];  [3];  [1];  [4]
  1. Harvard Univ., Cambridge, MA (United States)
  2. Univ. of California, Davis, CA (United States)
  3. Univ. of Bristol (United Kingdom)
  4. SETI Inst., Mountain View, CA (United States)
Publication Date:
Research Org.:
Harvard Univ., Cambridge, MA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1537327
Alternate Identifier(s):
OSTI ID: 1788232
Grant/Contract Number:  
NA0001804; NA0002937
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Geophysical Research. Planets
Additional Journal Information:
Journal Volume: 123; Journal Issue: 4; Journal ID: ISSN 2169-9097
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; Geochemistry & Geophysics

Citation Formats

Lock, Simon J., Stewart, Sarah T., Petaev, Michail I., Leinhardt, Zoë, Mace, Mia T., Jacobsen, Stein B., and Cuk, Matija. The Origin of the Moon Within a Terrestrial Synestia. United States: N. p., 2018. Web. doi:10.1002/2017je005333.
Lock, Simon J., Stewart, Sarah T., Petaev, Michail I., Leinhardt, Zoë, Mace, Mia T., Jacobsen, Stein B., & Cuk, Matija. The Origin of the Moon Within a Terrestrial Synestia. United States. https://doi.org/10.1002/2017je005333
Lock, Simon J., Stewart, Sarah T., Petaev, Michail I., Leinhardt, Zoë, Mace, Mia T., Jacobsen, Stein B., and Cuk, Matija. Wed . "The Origin of the Moon Within a Terrestrial Synestia". United States. https://doi.org/10.1002/2017je005333. https://www.osti.gov/servlets/purl/1537327.
@article{osti_1537327,
title = {The Origin of the Moon Within a Terrestrial Synestia},
author = {Lock, Simon J. and Stewart, Sarah T. and Petaev, Michail I. and Leinhardt, Zoë and Mace, Mia T. and Jacobsen, Stein B. and Cuk, Matija},
abstractNote = {The giant impact hypothesis remains the leading theory for lunar origin. However, current models struggle to explain the Moon’s composition and isotopic similarity with Earth. Here we present a new lunar origin model. High-energy, high-angular-momentum giant impacts can create a post-impact structure that exceeds the corotation limit, which defines the hottest thermal state and angular momentum possible for a corotating body. In a typical super-corotation-limit body, traditional definitions of mantle, atmosphere, and disk are not appropriate, and the body forms a new type of planetary structure, named a synestia. Using simulations of cooling synestias combined with dynamic, thermodynamic, and geochemical calculations, we show that satellite formation from a synestia can produce the main features of our Moon. We find that cooling drives mixing of the structure, and condensation generates moonlets that orbit within the synestia, surrounded by tens of bars of bulk silicate Earth vapor. The moonlets and growing moon are heated by the vapor until the first major element (Si) begins to vaporize and buffer the temperature. Moonlets equilibrate with bulk silicate Earth vapor at the temperature of silicate vaporization and the pressure of the structure, establishing the lunar isotopic composition and pattern of moderately volatile elements. Eventually, the cooling synestia recedes within the lunar orbit, terminating the main stage of lunar accretion. Our model shifts the paradigm for lunar origin from specifying a certain impact scenario to achieving a Moon-forming synestia. Giant impacts that produce potential Moon-forming synestias were common at the end of terrestrial planet formation.},
doi = {10.1002/2017je005333},
journal = {Journal of Geophysical Research. Planets},
number = 4,
volume = 123,
place = {United States},
year = {Wed Feb 28 00:00:00 EST 2018},
month = {Wed Feb 28 00:00:00 EST 2018}
}

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journal, March 2020


Forming Mercury by Giant Impacts
text, January 2018


Are the Moon's nearside-farside asymmetries the result of a giant impact?
text, January 2019


Extreme Debris Disk Variability: Exploring the Diverse Outcomes of Large Asteroid Impacts During the Era of Terrestrial Planet Formation
journal, April 2019

  • Su, Kate Y. L.; Jackson, Alan P.; Gáspár, András
  • The Astronomical Journal, Vol. 157, Issue 5
  • DOI: 10.3847/1538-3881/ab1260

Onset of Giant Planet Migration before 4480 Million Years Ago
journal, August 2019

  • Mojzsis, Stephen J.; Brasser, Ramon; Kelly, Nigel M.
  • The Astrophysical Journal, Vol. 881, Issue 1
  • DOI: 10.3847/1538-4357/ab2c03

Giant impacts stochastically change the internal pressures of terrestrial planets
journal, September 2019


Water and Volatile Inventories of Mercury, Venus, the Moon, and Mars
journal, July 2018

  • Greenwood, James P.; Karato, Shun-ichiro; Vander Kaaden, Kathleen E.
  • Space Science Reviews, Vol. 214, Issue 5
  • DOI: 10.1007/s11214-018-0526-1

Modeling a Transient Secondary Paleolunar Atmosphere: 3‐D Simulations and Analysis
journal, May 2019

  • Aleinov, I.; Way, M. J.; Harman, C.
  • Geophysical Research Letters, Vol. 46, Issue 10
  • DOI: 10.1029/2019gl082494

Molybdenum isotopic evidence for the late accretion of outer Solar System material to Earth
journal, May 2019


Primordial Earth Mantle Heterogeneity Caused by the Moon-forming Giant Impact?
journal, December 2019

  • Deng, Hongping; Ballmer, Maxim D.; Reinhardt, Christian
  • The Astrophysical Journal, Vol. 887, Issue 2
  • DOI: 10.3847/1538-4357/ab50b9

Primordial Earth Mantle Heterogeneity Caused by the Moon-forming Giant Impact?
text, January 2019

  • Deng, Hongping; Ballmer, Maxim D.; Reinhardt, Christian
  • IOP Publishing
  • DOI: 10.5167/uzh-182528

A giant impact as the likely origin of different twins in the Kepler-107 exoplanet system
journal, February 2019


Tin isotopes indicative of liquid–vapour equilibration and separation in the Moon-forming disk
journal, August 2019


The energy budgets of giant impacts
text, January 2019


Impact Dynamics of Moons Within a Planetary Potential
journal, April 2019

  • Rufu, R.; Aharonson, O.
  • Journal of Geophysical Research: Planets, Vol. 124, Issue 4
  • DOI: 10.1029/2018je005798

Time‐Dependent Hybrid Plasma Simulations of Lunar Electromagnetic Induction in the Solar Wind
journal, April 2019

  • Fuqua Haviland, H.; Poppe, A. R.; Fatemi, S.
  • Geophysical Research Letters, Vol. 46, Issue 8
  • DOI: 10.1029/2018gl080523