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Water oceans on high-density exoplanets from coupled interior-atmosphere modeling

Philipp Baumeister; Nicola Tosi; John Lee Grenfell; Jasmine MacKenzie


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{
  "publisher": "Zenodo", 
  "DOI": "10.5281/zenodo.5572685", 
  "title": "Water oceans on high-density exoplanets from coupled interior-atmosphere modeling", 
  "issued": {
    "date-parts": [
      [
        2021, 
        10, 
        15
      ]
    ]
  }, 
  "abstract": "<p>Liquid water is generally assumed to be the most important factor for the emergence of life, and so a major goal in exoplanet science is the search for planets with water oceans. On terrestrial planets, the silicate mantle is a large source of water, which can be outgassed into the atmosphere via volcanism. Outgassing is subject to a series of feedback processes between atmosphere and interior, which continually shape both atmospheric composition, pressure, and temperature, as well as interior dynamics.<br>\n<br>\nWe present the results of an extensive parameter study, where we use a newly developed 1D numerical model to simulate the coupled evolution of the atmosphere and interior of terrestrial exoplanets up to 5 Earth masses around<br>\nSun-like stars, with internal structures ranging from Moon- to Mercury-like. The model accounts for the main mechanisms controlling the global-scale, long-term evolution of stagnant-lid rocky planets (i.e. bodies without plate<br>\ntectonics), and it includes a large number of atmosphere-interior feedback processes, such as a CO<sub>2</sub> weathering cycle, volcanic outgassing, a water cycle between ocean and atmosphere, greenhouse heating, as well as the influence of a potential primordial H<sub>2</sub> atmosphere, which can be lost through escape processes.<br>\n<br>\nWe find that a significant majority of high-density exoplanets (i.e. Mercury-like planets with large cores) are able to outgas and sustain water on their surface. In contrast, most planets with intermediate, Earth-like densities either transition into a runaway greenhouse regime due to strong CO<sub>2</sub> outgassing, or retain part of their primordial atmosphere, which prevents water from being outgassed. This suggests that high-density planets could be the most promising targets when searching for suitable candidates for hosting liquid water.</p>\n\n<p>(Presenter: Philipp Baumeister)</p>", 
  "author": [
    {
      "family": "Philipp Baumeister"
    }, 
    {
      "family": "Nicola Tosi"
    }, 
    {
      "family": "John Lee Grenfell"
    }, 
    {
      "family": "Jasmine MacKenzie"
    }
  ], 
  "version": "v1", 
  "type": "speech", 
  "id": "5572685"
}
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