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The VERITAS mission investigation of Venus' interior structure and thermal state

Breuer, Doris and Wagner, Frank and Walterova, Michaela and Plesa, Ana-Catalina and Cascioli, G. and Iess, L. and Mazarico, E. and Smrekar, S. and Hensley, Scott (2021) The VERITAS mission investigation of Venus' interior structure and thermal state. AGU Fall Meeting, 13.-17. Dez. 2021, New Orleans USA & Online Everywhere.

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Official URL: https://agu.confex.com/agu/fm21/meetingapp.cgi/Paper/856612

Abstract

Although Venus is similar to Earth in terms of size and composition, basic parameters such as the size and state of its core are unknown or uncertain. For a better understanding of the interior structure and thermal state of Venus important information can be gained with the moment of inertia factor (MOIF), tidal Love number, k2 and the tidal phase lag, ε. These parameters are related to the rotational dynamics and the deformational response to tidal forcing of the Sun (period of 117 days) and NASA's upcoming discovery mission VERITAS will make it possible to achieve much higher accuracy than currently available. To calculate these parameters, we first compute structural and thermal models, which are then used to compute the tidal response of the planet. The interior models consist of three chemically separated layers: an iron-rich core surrounded by a silicate mantle and a crust. The mantle mineralogy is obtained using PERPLE_X and the thermal state using a mixing length formulation. The viscoelasticity of the mantle is parameterized using an Andrade rheology to calculate potential Love number k2 and the phase lag. In general, the MOIF constrains the concentration of mass in the interior, and thus the core size, while k2 helps to determine the state of the core and for a fluid core also its size. The tidal phase lag, which is related to the dissipation factor, Q, contributes to information on the thermal state of the interior because it is mostly sensitive to the mantle viscosity profile. Jointly solving for the independent variables MOIF and tidal response, k2 and ε, allows us to better constrain the results despite the solution space being multi-valued. We perform an error analysis using a large number of simulations to show to what extent we can constrain the structure and thermal state despite unknown quantities such as density, temperature, viscosity and rigidity.

Item URL in elib:https://elib.dlr.de/148232/
Document Type:Conference or Workshop Item (Poster)
Title:The VERITAS mission investigation of Venus' interior structure and thermal state
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Breuer, DorisDoris.Breuer (at) dlr.dehttps://orcid.org/0000-0001-9019-5304
Wagner, FrankUniversity of UlmUNSPECIFIED
Walterova, Michaelamichaela.walterova (at) dlr.dehttps://orcid.org/0000-0002-6779-3848
Plesa, Ana-CatalinaAna.Plesa (at) dlr.dehttps://orcid.org/0000-0003-3366-7621
Cascioli, G.Sapienza University of RomeUNSPECIFIED
Iess, L.Sapienza Università di Roma, ItalyUNSPECIFIED
Mazarico, E.Solar System Exploration Division, NASA-GSFC, Greenbelt, MD, USAUNSPECIFIED
Smrekar, S.Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Dr., Pasadena CA, 91109UNSPECIFIED
Hensley, ScottJPL-Radar Science & Engrg, Pasadena, CA, United StatesUNSPECIFIED
Date:2021
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:P35H-2224
Status:Published
Keywords:Venus, Interior Structure, Thermal state, VERITAS mission
Event Title:AGU Fall Meeting
Event Location:New Orleans USA & Online Everywhere
Event Type:international Conference
Event Dates:13.-17. Dez. 2021
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
Deposited By: Plesa, Dr. Ana-Catalina
Deposited On:12 Jan 2022 08:03
Last Modified:12 Jan 2022 08:03

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