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Abundance of water oceans on high-density exoplanets from coupled interior-atmosphere modeling

Baumeister, Philipp und Tosi, Nicola und MacKenzie, Jasmine und Grenfell, John Lee (2021) Abundance of water oceans on high-density exoplanets from coupled interior-atmosphere modeling. German-Swiss Geodynamics Workshop 2021, 2021-08-29 - 2021-09-01, Bad Belzig, Deutschland.

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Kurzfassung

Liquid water is generally assumed to be the an essential 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 [1,2]. 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 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 tectonics), and it includes a large number of atmosphere-interior feedback processes, such as a CO2 weathering cycle, volcanic outgassing, a water cycle between ocean and atmosphere, greenhouse heating, as well as the influence of a potential primordial H2 atmosphere, which can be lost through escape processes.We find that a significant majority of high-density exoplanets(i.e. Mercury-like planets with large metallic 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 CO2 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. [1] Tosi, N. et al. The habitability of a stagnant-lid earth. A&A605, A71 (2017). [2] Noack, L., Rivoldini, A. & Van Hoolst, T. Volcanism and outgassing of stagnant-lid planets: Implications for the habitable zone. Physics of the Earth and Planetary Interiors 269, 40-57 (2017).

elib-URL des Eintrags:https://elib.dlr.de/146526/
Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Abundance of water oceans on high-density exoplanets from coupled interior-atmosphere modeling
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Baumeister, PhilippPhilipp.Baumeister (at) dlr.dehttps://orcid.org/0000-0001-9284-0143NICHT SPEZIFIZIERT
Tosi, Nicolanicola.tosi (at) dlr.dehttps://orcid.org/0000-0002-4912-2848NICHT SPEZIFIZIERT
MacKenzie, JasmineTechnische Universität Berlin, Zentrum für Astronomie und Astrophysik, Hardenbergstraße 36, 10623 BerlinNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Grenfell, John LeeLee.Grenfell (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:31 August 2021
Referierte Publikation:Nein
Open Access:Ja
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:exoplanet, interior, outgassing, atmosphere, volcanism, geodynamics, habitability
Veranstaltungstitel:German-Swiss Geodynamics Workshop 2021
Veranstaltungsort:Bad Belzig, Deutschland
Veranstaltungsart:Workshop
Veranstaltungsbeginn:29 August 2021
Veranstaltungsende:1 September 2021
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Raumfahrt
HGF - Programmthema:Erforschung des Weltraums
DLR - Schwerpunkt:Raumfahrt
DLR - Forschungsgebiet:R EW - Erforschung des Weltraums
DLR - Teilgebiet (Projekt, Vorhaben):R - Planetary Evolution and Life, R - Exploration des Sonnensystems
Standort: Berlin-Adlershof
Institute & Einrichtungen:Institut für Planetenforschung > Planetenphysik
Institut für Planetenforschung > Extrasolare Planeten und Atmosphären
Hinterlegt von: Baumeister, Philipp
Hinterlegt am:01 Dez 2021 08:48
Letzte Änderung:24 Apr 2024 20:45

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