Enhanced atmospheric loss on protoplanets at the giant impact phase in the presence of oceans

Article Abstract:

The absence or presence of an ocean at the surface of a protoplanet during the giant impact phase that could determine its subsequent atmospheric amount and composition is proposed. Numerical simulations are used to demonstrate that the presence of an ocean significantly enhances the loss of atmosphere during a giant impact due to evaporation of the ocean and lower shock impedance of the ocean compared to the ground.

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[super 40]Ar retention in the terrestrial planets

Article Abstract:

The solubility and diffusivity of Argon in the upper and lower mantles of the terrestrial planets is investigated. The hydration of argon-rich olivine and orthopyroxene present in the lithosphere is speculated as one of the causes of diffusion of argon into the atmosphere.

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Being there

Article Abstract:

The protoplanets that collided to make the Earth could themselves have had atmospheres and oceans. There is fossil evidence that Venus has vastly more argon and neon than Earth.

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