Formation of Venus, Earth and Mars: Constrained by Isotopes

  title={Formation of Venus, Earth and Mars: Constrained by Isotopes},
  author={Helmut Lammer and Ramon Brasser and Anders Johansen and Manuel Scherf and Martin Leitzinger},
  journal={Space Science Reviews},
Here we discuss the current state of knowledge of terrestrial planet formation from the aspects of different planet formation models and isotopic data from Hf-W, U-Pb, lithophile-siderophile elements, Ca/Ca isotope samples from planetary building blocks, recent reproduction attempts from Ar/Ar, Ne/Ne, Ar/Ne isotope ratios in Venus’ and Earth’s atmospheres, the expected solar He abundance in Earth’s deep mantle and Earth’s D/H sea water ratios that shed light on the accretion time of the early… 

Early planetary processes and light elements in iron-dominated cores

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Future Missions Related to the Determination of the Elemental and Isotopic Composition of Earth, Moon and the Terrestrial Planets

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Loss and Fractionation of Noble Gas Isotopes and Moderately Volatile Elements from Planetary Embryos and Early Venus, Earth and Mars

Here we discuss the current state of knowledge on how atmospheric escape processes can fractionate noble gas isotopes and moderately volatile rock-forming elements that populate primordial

Solid Accretion onto Neptune-mass Planets. I. In Situ Accretion and Constraints from the Metallicity of Uranus and Neptune

  • Y. Hasegawa
  • Physics, Geology
    The Astrophysical Journal
  • 2022
The currently available, detailed properties (e.g., isotopic ratios) of solar system planets may provide guides for constructing better approaches to exoplanet characterization. With this motivation,

The Exosphere as a Boundary: Origin and Evolution of Airless Bodies in the Inner Solar System and Beyond Including Planets with Silicate Atmospheres

In this review we discuss all the relevant solar/stellar radiation and plasma parameters and processes that act together in the formation and modification of atmospheres and exospheres that consist

The Occurrence-weighted Median Planets Discovered by Transit Surveys Orbiting Solar-type Stars and Their Implications for Planet Formation and Evolution

Since planet occurrence and primordial atmospheric retention probability increase with period, the occurrence-weighted median planets discovered by transit surveys may bear little resemblance to the

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Understanding planet formation using microgravity experiments

In 2018, images were released of a planet being formed around the star PDS 70, offering a tantalizing glimpse into how planets come into being. However, many questions remain about how dust evolves



Fast accretion of the Earth with a late Moon-forming giant impact

A model of the 182W isotopic evolution of the accreting Earth, including constraints from partitioning of refractory siderophile elements (Ni, Co, W, V, and Nb) during core formation, which can explain the discrepancy in the timing of the Moon-forming giant impact (MGI).

The isotopic nature of the Earth’s accreting material through time

It is shown that elements with distinct affinities for metal can be used to decipher the isotopic nature of the Earth’s accreting material through time, and indicates that the giant impactor that formed the Moon probably had an isotopic composition similar to that of theEarth, hence relaxing the constraints on models of lunar formation.

Origin and evolution of the atmospheres of early Venus, Earth and Mars

We review the origin and evolution of the atmospheres of Earth, Venus and Mars from the time when their accreting bodies were released from the protoplanetary disk a few million years after the

HF-W Chronometry and Inner Solar System Accretion Rates

Models for the mechanisms of accretion of the terrestrial planets are re-examined using the experimental technique of high-precision isotope ratio mass spectrometry of tungsten (W). The decay of

Isotopic evolution of the protoplanetary disk and the building blocks of Earth and Moon

It is inferred that no primitive meteorite matches the terrestrial composition and the protoplanetary disk material from which Earth and the Moon accreted is therefore largely unconstrained, and that this secular evolution reflects admixing of pristine outer-Solar-System material into the thermally processed inner prot planetetary disk associated with the accretion of mass to the proto-Sun.

Iron isotope evidence for very rapid accretion and differentiation of the proto-Earth

The results suggest a rapid accretion and differentiation of Earth during the ~5–million year disk lifetime, when the volatile-rich CI-like material is accreted to the proto-Sun via the inner disk.

Origin of Earth's water: sources and constraints

We review the state of knowledge on the origin of Earth's water. Empirical constraints come from chemical and isotopic measurements of solar system bodies and of Earth itself. Dynamical models have

The Formation of Mars: Building Blocks and Accretion Time Scale

In this review paper I address the current knowledge of the formation of Mars, focusing on its primary constituents, its formation time scale and its small mass compared to Earth and Venus. I argue