title: Timing of the formation and migration of giant planets as constrained by CB chondrites.
abstract: The presence, formation, and migration of giant planets fundamentally shape planetary systems. However, the timing of the formation and migration of giant planets in our solar system remains largely unconstrained. Simulating planetary accretion, we find that giant planet migration produces a relatively short-lived spike in impact velocities lasting ~0.5 My. These high-impact velocities are required to vaporize a significant fraction of Fe,Ni metal and silicates and produce the CB (Bencubbin-like) metal-rich carbonaceous chondrites, a unique class of meteorites that were created in an impact vapor-melt plume ~5 My after the first solar system solids. This indicates that the region where the CB chondrites formed was dynamically excited at this early time by the direct interference of the giant planets. Furthermore, this suggests that the formation of the giant planet cores was protracted and the solar nebula persisted until ~5 My.
authors.affiliation: Department of Earth, Environmental and Planetary Sciences, Brown University, 324 Brook Street, Providence, RI 02912, USA.
authors.forename: Brandon C
authors.initials: BC
authors.lastname: Johnson
authors.affiliation: Department of Space Studies, Southwest Research Institute, 1050 Walnut Street, Suite 300, Boulder, CO 80302, USA.
authors.forename: Kevin J
authors.initials: KJ
authors.lastname: Walsh
authors.affiliation: Department of Earth, Atmospheric, and Planetary Sciences, Purdue University, 550 Stadium Mall Drive, West Lafayette, IN 47907, USA.
authors.forename: David A
authors.initials: DA
authors.lastname: Minton
authors.affiliation: Hawai'i Institute of Geophysics and Planetology, School of Ocean and Earth Science and Technology, University of Hawai'i at Mānoa, 1680 East-West Road, Honolulu, HI 96822, USA.
authors.forename: Alexander N
authors.initials: AN
authors.lastname: Krot
authors.affiliation: Department of Space Studies, Southwest Research Institute, 1050 Walnut Street, Suite 300, Boulder, CO 80302, USA.
authors.forename: Harold F
authors.initials: HF
authors.lastname: Levison
keywords: Early solar system history; giant planet; meteorites; planet migration