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"Isocrater" impacts: Conditions and mantle dynamical responses for different impactor types

Ruedas, T. and Breuer, Doris (2018) "Isocrater" impacts: Conditions and mantle dynamical responses for different impactor types. Icarus, 306, pp. 94-115. Elsevier. DOI: 10.1016/j.icarus.2018.02.005 ISSN 0019-1035

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Official URL: http://dx.doi.org/10.1016/j.icarus.2018.02.005


Impactors of different types and sizes can produce a final crater of the same diameter on a planet under certain conditions. We derive the condition for such "isocrater impacts" from scaling laws, as well as relations that describe how the different impactors affect the interior of the target planet; these relations are also valid for impacts that are too small to affect the mantle. The analysis reveals that in a given isocrater impact, asteroidal impactors produce anomalies in the interior of smaller spatial extent than cometary or similar impactors. The differences in the interior could be useful for characterizing the projectile that formed a given crater on the basis of geophysical observations and potentially offer a possibility to help constrain the demographics of the ancient impactor population. A series of numerical models of basin-forming impacts on Mercury, Venus, the Moon, and Mars illustrates the dynamical effects of the different impactor types on different planets. It shows that the signature of large impacts may be preserved to the present in Mars, the Moon, and Mercury, where convection is less vigorous and much of the anomaly merges with the growing lid. On the other hand, their signature will long have been destroyed in Venus, whose vigorous convection and recurring lithospheric instabilities obliterate larger coherent anomalies.

Item URL in elib:https://elib.dlr.de/118772/
Document Type:Article
Title:"Isocrater" impacts: Conditions and mantle dynamical responses for different impactor types
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Ruedas, T.thomas.ruedas (at) dlr.dehttps://orcid.org/0000-0002-7739-1412
Breuer, DorisDoris.Breuer (at) dlr.dehttps://orcid.org/0000-0001-9019-5304
Date:May 2018
Journal or Publication Title:Icarus
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1016/j.icarus.2018.02.005
Page Range:pp. 94-115
Keywords:Mars; mantle convection; impacts
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 Planetary Evolution and Life
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Planetary Physics
Deposited By: Ruedas Gomez, Thomas
Deposited On:19 Mar 2018 10:42
Last Modified:06 Sep 2019 15:26

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