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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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    "description": "<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>", 
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    "keywords": [
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    "publication_date": "2021-10-15", 
    "creators": [
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        "affiliation": "DLR Berlin, Technische Universit\u00e4t Berlin", 
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        "affiliation": "DLR Berlin", 
        "name": "Nicola Tosi"
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        "orcid": "0000-0003-3646-5339", 
        "affiliation": "DLR Berlin", 
        "name": "John Lee Grenfell"
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        "affiliation": "Technische Universit\u00e4t Berlin", 
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