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A primordial origin for the composition similarity between the Earth and the Moon

dc.contributor.authorMASTROBUONO-BATTISTI, Alessandra,
dc.contributor.authorPERETS, Hagai B.,
hal.structure.identifierECLIPSE 2015
dc.contributor.authorRAYMOND, Sean N.
dc.date.issued2015
dc.identifier.issn0028-0836
dc.description.abstractEnMost of the properties of the Earth-Moon system can be explained by a collision between a planetary embryo and the growing Earth late in the accretion process. Simulations show that most of the material that eventually aggregates to form the Moon originates from the impactor. However, analysis of the terrestrial and lunar isotopic composition show them to be highly similar. In contrast, the compositions of other solar system bodies are significantly different than the Earth and Moon. This poses a major challenge to the giant impact scenario since the Moon-forming impactor is then thought to also have differed in composition from the proto-Earth. Here we track the feeding zones of growing planets in a suite of simulations of planetary accretion, in order to measure the composition of Moon-forming impactors. We find that different planets formed in the same simulation have distinct compositions, but the compositions of giant impactors are systematically more similar to the planets they impact. A significant fraction of planet-impactor pairs have virtually identical compositions. Thus, the similarity in composition between the Earth and Moon could be a natural consequence of a late giant impact.
dc.language.isoen
dc.publisherNature Publishing Group
dc.subject.enAstrophysics - Earth and Planetary Astrophysics
dc.title.enA primordial origin for the composition similarity between the Earth and the Moon
dc.typeArticle de revue
dc.identifier.doi10.1038/nature14333
dc.subject.halPlanète et Univers [physics]/Astrophysique [astro-ph]/Planétologie et astrophysique de la terre [astro-ph.EP]
dc.identifier.arxiv1502.07346
bordeaux.journalNature
bordeaux.page212-215
bordeaux.volume520
bordeaux.issue7546
bordeaux.peerReviewedoui
hal.identifierhal-01137371
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-01137371v1
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