Formation and survival of water vapor in the terrestrial planet-forming region.
Recent astronomical observations have revealed what may prove to be the ubiquity of water vapor during the early stages of planet formation. We present here a simple mechanism showing how water vapor forms in situ and is capable of shielding itself from molecule-destroying stellar radiation. The absorption of this radiation by water can control the thermodynamics of the terrestrial planet-forming zone. Similar to Earth's ozone layer, which shelters the chemistry of life, the water layer protects other water molecules and allows for a rich organic chemistry. The total abundance of water vapor in the natal habitable zone is equal to that of several thousand oceans.
Bethell
Thomas
T
Department of Astronomy, University of Michigan, 830 Dennison Building, 500 Church Street, Ann Arbor, MI 48109, USA. tbethell@astro.umich.edu
Bergin
Edwin
E
D019419:Evolution, Planetary; D008962:Models, Theoretical; D016083:Planets; D013227:Steam; D013696:Temperature
D013227:Steam