October 15, 2021 Presentation Open Access

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

DCAT Export

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        <foaf:name>Nicola Tosi</foaf:name>
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        <foaf:name>John Lee Grenfell</foaf:name>
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    <dct:title>Water oceans on high-density exoplanets from coupled interior-atmosphere modeling</dct:title>
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    <dct:issued rdf:datatype="http://www.w3.org/2001/XMLSchema#gYear">2021</dct:issued>
    <dcat:keyword>Exoplanets</dcat:keyword>
    <dcat:keyword>Habitabiltiy</dcat:keyword>
    <dcat:keyword>Planet interiors</dcat:keyword>
    <dct:issued rdf:datatype="http://www.w3.org/2001/XMLSchema#date">2021-10-15</dct:issued>
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    <dct:description>&lt;p&gt;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.&lt;br&gt; &lt;br&gt; We 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&lt;br&gt; Sun-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&lt;br&gt; tectonics), and it includes a large number of atmosphere-interior feedback processes, such as a CO&lt;sub&gt;2&lt;/sub&gt; weathering cycle, volcanic outgassing, a water cycle between ocean and atmosphere, greenhouse heating, as well as the influence of a potential primordial H&lt;sub&gt;2&lt;/sub&gt; atmosphere, which can be lost through escape processes.&lt;br&gt; &lt;br&gt; We 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&lt;sub&gt;2&lt;/sub&gt; 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.&lt;/p&gt; &lt;p&gt;(Presenter: Philipp Baumeister)&lt;/p&gt;</dct:description>
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