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Early evolution of Venus and Earth constrained by the reproduction of measured Ar, Ne isotope and K/U elemental ratios

Lammer, H and Leitzinger, M. and Burger, C. and Kubyshkina, D. and Scherf, M. and Maindl, T. and Johnstone, Colin and Tosi, Nicola and Nikolaou, Athanasia and Marcq, E. and Fossati, L. and Erkaev, Nikolai V. and Güdel, Manuel and Noack, L. and Kislyakova, K. G. and Ragossnig, F. and Pilat-Lohinger, Elke (2018) Early evolution of Venus and Earth constrained by the reproduction of measured Ar, Ne isotope and K/U elemental ratios. European Planetary Science Congress 2018, 16 Sep - 21 Sep 2018, Berlin, Germany.

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Abstract

We show that the measured present day atmospheric Ar,Ne isotope ratios and elemental K/U ratios measured for Venus and Earth can be reproduced by a combination of EUV -driven hydrodynamic hydrogen escape and impacts happening during accretion. We find that both protoplanets formed within the solar nebula and accreted large enough masses able to capture thin hydrogen envelopes, which were then lost within a few 10s of million years after disk dispersal. We further show that early Venus was surrounded by a denser primordial hydrogen- dominated atmosphere compared to a less massive proto-Earth that accreted its final mass by pre-fractionated dry impactors and about two percent carbonaceous chondrites after the thin primordial hydrogen envelope was lost. Our results agree with hafnium-wolfram isotope chronometric evidence that favors a fast accretion scenario of the Earth with a late Moon-forming impact. We conclude with a discussion on the implications of these findings in relation to planetary evolution of terrestrial exoplanets and their potential habitability.

Item URL in elib:https://elib.dlr.de/121651/
Document Type:Conference or Workshop Item (Poster)
Title:Early evolution of Venus and Earth constrained by the reproduction of measured Ar, Ne isotope and K/U elemental ratios
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Lammer, HÖsterreichische Akademie der WissenschaftenUNSPECIFIED
Leitzinger, M.Insitute for Physics, Graz, AustriaUNSPECIFIED
Burger, C.Department of Astrophysics, University of Vienna, AustriaUNSPECIFIED
Kubyshkina, D.Space Research Institute, Austrian Academy of Sciences, Graz, AustriaUNSPECIFIED
Scherf, M.Space Research Institute, Austrian Academy of Sciences, Graz, AustriaUNSPECIFIED
Maindl, T.Department of Astrophysics, University of Vienna, AustriaUNSPECIFIED
Johnstone, ColinUniversity of Vienna, Department of AstrophysicsUNSPECIFIED
Tosi, Nicolanicola.tosi (at) dlr.deUNSPECIFIED
Nikolaou, AthanasiaAthanasia.Nikolaou (at) dlr.deUNSPECIFIED
Marcq, E.emmanuel.marcq (at) latmos.ipsl.frUNSPECIFIED
Fossati, L.Space Research Institute, Austrian Academy of Sciences, Schmiedlstrasse 6, 8042, Graz, AustriaUNSPECIFIED
Erkaev, Nikolai V.Institute of Computational Modelling, Russian Academy of Sciences, Krasnoyarsk, Russian FederationUNSPECIFIED
Güdel, ManuelInstitute for Astronomy, University of Vienna, Türkenschanzstr. 17, A-1180 Vienna, AustriaUNSPECIFIED
Noack, L.Department of Earth Sciences / Institute of Geological Sciences, Free University Berlin,UNSPECIFIED
Kislyakova, K. G.University of Vienna, Department of AstrophysicsUNSPECIFIED
Ragossnig, F.Department of Astrophysics, University of Vienna, AustriaUNSPECIFIED
Pilat-Lohinger, ElkeInstitute of Astrophysics, University of Vienna, Vienna, Austria.UNSPECIFIED
Date:2018
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:isotope, Venus, Earth, Ar, Ne, K/U, early evolution, terrestrial
Event Title:European Planetary Science Congress 2018
Event Location:Berlin, Germany
Event Type:international Conference
Event Dates:16 Sep - 21 Sep 2018
Organizer:Copernicus
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Science and Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Erforschung des Weltraums
DLR - Research theme (Project):R - Vorhaben Exploration des Sonnensystems
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Planetary Physics
Deposited By: Nikolaou, Athanasia
Deposited On:29 Oct 2018 09:14
Last Modified:31 Jul 2019 20:19

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