Ryugu’s nucleosynthetic heritage from the outskirts of the Solar System
Citations Over TimeTop 1% of 2022 papers
Abstract
Little is known about the origin of the spectral diversity of asteroids and what it says about conditions in the protoplanetary disk. Here, we show that samples returned from Cb-type asteroid Ryugu have Fe isotopic anomalies indistinguishable from Ivuna-type (CI) chondrites, which are distinct from all other carbonaceous chondrites. Iron isotopes, therefore, demonstrate that Ryugu and CI chondrites formed in a reservoir that was different from the source regions of other carbonaceous asteroids. Growth and migration of the giant planets destabilized nearby planetesimals and ejected some inward to be implanted into the Main Belt. In this framework, most carbonaceous chondrites may have originated from regions around the birthplaces of Jupiter and Saturn, while the distinct isotopic composition of CI chondrites and Ryugu may reflect their formation further away in the disk, owing their presence in the inner Solar System to excitation by Uranus and Neptune.
Related Papers
- → Collisional destruction experiment of chondrules and formation of fragments in the solar nebula(2014)10 cited
- Origins of Solar Systems Program(2002)
- Final Summary of Research Report to the National Aeronautics and Space Administration Origins of Solar Systems Program(2003)