Exoplanet secondary atmosphere loss and revival

  title={Exoplanet secondary atmosphere loss and revival},
  author={Edwin Stephen Kite and Megan N. Barnett},
  journal={Proceedings of the National Academy of Sciences},
  pages={18264 - 18271}
  • E. Kite, M. Barnett
  • Published 3 June 2020
  • Geology, Physics
  • Proceedings of the National Academy of Sciences
Significance Earth and Venus have significant atmospheres, but Mercury does not. Thousands of exoplanets are known, but we know almost nothing about rocky exoplanet atmospheres. Many rocky exoplanets were formed by a sub-Neptune-to-super-Earth conversion process during which planets lose most of their H2-rich (primary) atmospheres and are reduced in volume by a factor of >2. Does such a gas-rich adolescence increase or decrease the likelihood that super-Earths will subsequently exhibit a H2… 

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