New insight into the solar system's transition disk phase provided by the metal-rich carbonaceous chondrite Isheyevo

Melissa A. Morris, Laurence Garvie, L. Paul Knauth

Research output: Contribution to journalArticle

9 Scopus citations

Abstract

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 (10-12-10-11 g cm-3). As such, Isheyevo presents the first evidence of our own transition disk and provides new constraints on the evolution of our solar nebula.

Original languageEnglish (US)
Article numberL22
JournalAstrophysical Journal Letters
Volume801
Issue number2
DOIs
StatePublished - Mar 10 2015

Keywords

  • meteorites meteors meteoroids
  • planet-disk interactions
  • planets and satellites: formation
  • protoplanetary disks

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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