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Title: NEW INSIGHT INTO THE SOLAR SYSTEM’S TRANSITION DISK PHASE PROVIDED BY THE METAL-RICH CARBONACEOUS CHONDRITE ISHEYEVO

Many aspects of planet formation are controlled by the amount of gas remaining in the natal protoplanetary disks (PPDs). Infrared observations show that PPDs undergo a transition stage at several megayears, during which gas densities are reduced. Our Solar System would have experienced such a stage. However, there is currently no data that provides insight into this crucial time in our PPD’s evolution. We show that the Isheyevo meteorite contains the first definitive evidence for a transition disk stage in our Solar System. Isheyevo belongs to a class of metal-rich meteorites whose components have been dated at almost 5 Myr after formation of Ca, Al-rich inclusions, and exhibits unique sedimentary layers that imply formation through gentle sedimentation. We show that such layering can occur via the gentle sweep-up of material found in the impact plume resulting from the collision of two planetesimals. Such sweep-up requires gas densities consistent with observed transition disks (10{sup −12}–10{sup −11} g cm{sup −3}). As such, Isheyevo presents the first evidence of our own transition disk and provides new constraints on the evolution of our solar nebula.
Authors:
 [1] ;  [2] ;  [3]
  1. State University of New York, Cortland, NY 13045 (United States)
  2. Center for Meteorite Studies, Arizona State University, Tempe, AZ 85287 (United States)
  3. School of Earth and Space Exploration, Arizona State University, Tempe, AZ 85287 (United States)
Publication Date:
OSTI Identifier:
22518827
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal Letters; Journal Volume: 801; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ALUMINIUM; CALCIUM; CHONDRITES; DENSITY; INCLUSIONS; LAYERS; METEOROIDS; PLANETS; PROTOPLANETS; SATELLITES; SEDIMENTATION; SOLAR NEBULA; SOLAR SYSTEM