title: A deep crust-mantle boundary in the asteroid 4 Vesta.
abstract: The asteroid 4 Vesta was recently found to have two large impact craters near its south pole, exposing subsurface material. Modelling suggested that surface material in the northern hemisphere of Vesta came from a depth of about 20 kilometres, whereas the exposed southern material comes from a depth of 60 to 100 kilometres. Large amounts of olivine from the mantle were not seen, suggesting that the outer 100 kilometres or so is mainly igneous crust. Here we analyse the data on Vesta and conclude that the crust-mantle boundary (or Moho) is deeper than 80 kilometres.
authors.affiliation: EPSL, Institute of Condensed Matter Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015 Lausanne, Switzerland.
authors.forename: Harold
authors.initials: H
authors.lastname: Clenet
authors.affiliation: Physics Institute, Space Research and Planetary Sciences, Center for Space and Habitability, University of Bern, Sidlerstrasse 5, 3012 Bern, Switzerland.
authors.forename: Martin
authors.initials: M
authors.lastname: Jutzi
authors.affiliation: Université de Bretagne Occidentale, Institut Universitaire Européen de la Mer, CNRS UMR 6538, Place Nicolas Copernic, 29280 Plouzané, France.
authors.forename: Jean-Alix
authors.initials: JA
authors.lastname: Barrat
authors.affiliation: School of Earth and Space Exploration, Arizona State University, PO Box 876004, Tempe, Arizona 85287, USA.
authors.forename: Erik I
authors.initials: EI
authors.lastname: Asphaug
authors.affiliation: Physics Institute, Space Research and Planetary Sciences, Center for Space and Habitability, University of Bern, Sidlerstrasse 5, 3012 Bern, Switzerland.
authors.forename: Willy
authors.initials: W
authors.lastname: Benz
authors.affiliation: EPSL, Institute of Condensed Matter Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015 Lausanne, Switzerland.
authors.forename: Philippe
authors.initials: P
authors.lastname: Gillet