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Effects of different equations of state on interior structure models of exoplanets

Baumeister, Philipp and MacKenzie, Jasmine and Tosi, Nicola and Godolt, Mareike (2018) Effects of different equations of state on interior structure models of exoplanets. 7th Joint Workshop on High Pressure, Planetary and Plasma Physics (HP4), 2018-10-10 - 2018-10-12, Berlin, Germany.

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One of the major aspects of current exoplanetary science is the characterization of the planetary interior. A common approach to characterize the interior of a known exoplanet is the use of numerical models to compute an interior structure which complies with the measured mass and radius of the planet (Sotin et al. 2007, Seager et al. 2007). In general, however, possible solutions are highly degenerate, with multiple, qualitatively different interior compositions that can match the observations equally well. It is therefore necessary to run numerous interior structure models covering a wide range of possible interior parameters to constrain solutions. In this work we aim at quantifying the influence of different isothermal and thermally-dependent equations of state (EoS) on the computation of the interior of exoplanets. We employ a 1D structure model to perform an extensive parameter study modelling the interior structure of a vast number of sub-Neptunian exoplanets of different bulk composition, ranging from super-Earths consisting just of a metallic core and a silicate mantle, to sub-Neptunes including ice and gaseous layers. Each model run is performed with a number of different isothermal as well as thermally-dependent EoS. We find that for the rocky interior of an exoplanet, the choice of EoS has little influence on the characterization of the interior structure of the planet, whereas the mineralogical composition of the planetary layers can lead to double digit uncertainties from just small compositional changes.

Item URL in elib:https://elib.dlr.de/125025/
Document Type:Conference or Workshop Item (Speech)
Title:Effects of different equations of state on interior structure models of exoplanets
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Baumeister, PhilippUNSPECIFIEDhttps://orcid.org/0000-0001-9284-0143UNSPECIFIED
MacKenzie, JasmineTechnische Universität Berlin, Zentrum für Astronomie und Astrophysik, Hardenbergstraße 36, 10623 BerlinUNSPECIFIEDUNSPECIFIED
Tosi, NicolaUNSPECIFIEDhttps://orcid.org/0000-0002-4912-2848UNSPECIFIED
Date:October 2018
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Keywords:equation of state, exoplanets, mass-radius diagrams, interior structures
Event Title:7th Joint Workshop on High Pressure, Planetary and Plasma Physics (HP4)
Event Location:Berlin, Germany
Event Type:Workshop
Event Start Date:10 October 2018
Event End Date:12 October 2018
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Space Exploration
DLR - Research theme (Project):R - Exploration of the Solar System
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Planetary Physics
Institute of Planetary Research > Extrasolar Planets and Atmospheres
Deposited By: Baumeister, Philipp
Deposited On:14 Dec 2018 08:38
Last Modified:24 Apr 2024 20:29

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