Evolution of Mercury’s Earliest Atmosphere

  title={Evolution of Mercury’s Earliest Atmosphere},
  author={Noah J{\"a}ggi and D. Gamborino and Dan J. Bower and Paolo A. Sossi and Aaron S. Wolf and Apurva Oza and Audrey Vorburger and Andr{\'e} Galli and Peter Wurz},
  journal={The Planetary Science Journal},
MESSENGER observations suggest a magma ocean formed on proto-Mercury, during which evaporation of metals and outgassing of C- and H-bearing volatiles produced an early atmosphere. Atmospheric escape subsequently occurred by plasma heating, photoevaporation, Jeans escape, and photoionization. To quantify atmospheric loss, we combine constraints on the lifetime of surficial melt, melt composition, and atmospheric composition. Consideration of two initial Mercury sizes and four magma ocean… 


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