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Spectral characterization of V-type asteroids - II. A statistical analysis

Journal
Date Issued
2016
Author(s)
•
•
Lazzaro, D.
•
•
Fulvio, D.
•
Fulchignoni, M.
DOI
Description
In this article, we make use of meteorite spectra taken with the NASA RELAB facility at Brown University. This work was supported by INAF (PRIN–INAF 2011: Vesta as benchmark to understand Solar system history). DL acknowledge CNPq and FAPERJ for diverse grants. We would like to thank Ren´e Duffard and Maria Cristina De Sanctis for the useful discussions, and the Dawn Team for the use of the VIR data. We finally thank the referee Nicholas Moskovitz for the useful comments.
Abstract
In recent years, several small basaltic V-type asteroids have been identified all around the main belt. Most of them are members of the Vesta dynamical family, but an increasingly large number appear to have no link with it. The question that arises is whether all these basaltic objects do indeed come from Vesta. To find the answer to the above questioning, we decided to perform a statistical analysis of the spectroscopic and mineralogical properties of a large sample of V-types, with the objective to highlight similarities and differences among them, and shed light on their unique, or not, origin. The analysis was performed using 190 visible and near-infrared spectra from the literature for 117 V-type asteroids. The asteroids were grouped according to their dynamical properties and their computed spectral parameters compared. Comparison was also performed with spectral parameters of a sample of HED meteorites and data of the surface of Vesta taken by the VIR instrument on board of the Dawn spacecraft. Our analysis shows that although most of the V-type asteroids in the inner main belt do have a surface composition compatible with an origin from Vesta, this seem not to be the case for V-types in the middle and outer main belt.
Volume
455
Issue
3
Start page
2871
Uri
Url
Issn Identifier
0035-8711
Ads BibCode
2016MNRAS.455.2871I
Rights
open.access
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