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Modeling of giant impact into a differentiated asteroid and implications for the large scale throughs on Vesta

Buczkowski, D. L. and Iyer, K. A. and Raymond, C. A. and Wyrick, D. Y. and Kahn, E. G. and Nathues, A. and Gaskell, R. W. and Roatsch, Thomas and Preusker, Frank and Russell, C. T. (2012) Modeling of giant impact into a differentiated asteroid and implications for the large scale throughs on Vesta. AGU Fall Meeting 2012, 3.-7. Dez. 2012, San Francisco.

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Abstract

Linear structures have been identified in a concentric orientation around impact craters on several asteroids (e.g. Ida [1], Eros [2], Lutetia [3]) and their formation tied to the impact event [1,2]. Images of Vesta taken by the Dawn spacecraft reveal large-scale linear structural features in a similar orientation around the Rheasilvia and Veneneia basins [4]. However, the dimensions and shape of these features suggest that they are graben similar to those observed on terrestrial planets, not fractures or grooves such as are found on Ida, Eros and Lutetia [5]. Although the fault plane analysis [4] implies that impact may have been responsible for triggering the formation of these features as on the smaller asteroids, we suggest the significantly different morphology implies that some other component must also have been involved in their development. It has been established that Vesta is a differentiated body with a core [6]. This differentiated interior could be a factor in the troughs’ resemblance to planetary faults rather than asteroidal fractures, as it is predicted that the stresses resultant from impact would be amplified and reoriented compared to a similar impact on an undifferentiated body. Preliminary CTH hydrocode [7] models of a 530 km sphere composed of a basalt analog with a 220 km iron core [6] show that the impact of a 50 km object results in different patterns of tensile stress and pressure compared to an undifferentiated sphere of the same material and diameter. While these first-order models have yet to fully mimic the observations we’ve made on Vesta, they do demonstrate that the density contrast in Vesta’s differentiated interior affects the stresses resulting from the Rheasilivia and Veneneia impacts. It is this impedance mismatch that we suggest is responsible for the development of Vesta’s planet-like troughs. Thus, future identification of planetary-style tectonic features on small solar system bodies may then imply a differentiated interior like Vesta’s. The authors gratefully acknowledge the support of the Dawn Instrument, Operations, and Science Teams. This work was funded by the Dawn at Vesta Participating Science Program.

Item URL in elib:https://elib.dlr.de/78901/
Document Type:Conference or Workshop Item (Speech)
Title:Modeling of giant impact into a differentiated asteroid and implications for the large scale throughs on Vesta
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Buczkowski, D. L.JHU-APLUNSPECIFIED
Iyer, K. A.JHU-APLUNSPECIFIED
Raymond, C. A.NASA/JPLUNSPECIFIED
Wyrick, D. Y.SWRI, San Antonio, Texas, USAUNSPECIFIED
Kahn, E. G.JHU-APLUNSPECIFIED
Nathues, A.MPSUNSPECIFIED
Gaskell, R. W.PSI, Tucson, Arizona,UNSPECIFIED
Roatsch, Thomasthomas.roatsch (at) dlr.deUNSPECIFIED
Preusker, Frankfrank.preusker (at) dlr.deUNSPECIFIED
Russell, C. T.UCLA, Los Angeles, California, USAUNSPECIFIED
Date:6 December 2012
Open Access:No
In DOAJ:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Asteorids, Dawn, Vesta
Event Title:AGU Fall Meeting 2012
Event Location:San Francisco
Event Type:international Conference
Event Dates:3.-7. Dez. 2012
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 - Projekt DAWN
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Planetary Geology
Deposited By: Roatsch, Dr.rer.nat. Thomas
Deposited On:04 Dec 2012 10:02
Last Modified:09 Jan 2013 14:48

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