2008/08/13 by L. T. Elkins‐Tanton, L. Elkins-Tanton, Sara Seager +1
Earth and Planetary Sciences · Physics and Astronomy · #Accretion (finance) #Astro and Planetary Science #Astrobiology #Astronomy #Astrophysics #Atmosphere (unit) #Carbonaceous chondrite #Chondrite #Earth (classical element) #Exoplanet #Geology #High-pressure geophysics and materials #Hydrogen #Meteorite #Outgassing #Physics #Planet #Stellar, planetary, and galactic studies #Terrestrial planet #astro-ph
paper · pdf · doi:10.1086/591433
ApJ, in press. 32 pages, 6 figures
arxiv created 2008/08/13 · openalex publication_date 2008/09/26 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Terrestrial-like exoplanets may obtain atmospheres from three primary sources: capture of nebular gases, degassing during accretion, and degassing from subsequent tectonic activity. Here we model degassing during accretion to estimate the range of atmospheric mass and composition on exoplanets ranging from 1 to 30 Earth masses. We use bulk compositions drawn from primitive and differentiated meteorite compositions. Degassing alone can create a wide range of masses of planetary atmospheres, ranging from less than 1% of the planet's total mass up to ~6 percent by mass (mass%) of hydrogen, ~20 mass% of water, and/or ~5 mass% of carbon compounds. Hydrogen-rich atmospheres can be outgassed as a result of oxidizing metallic iron with water, and excess water and carbon can produce atmospheres through simple degassing. As a byproduct of our atmospheric outgassing models we find that modest initial water contents (10 mass% of the planet and above) create planets with deep surface liquid water oceans soon after accretion is complete.