Discovery of the Evolving Process of Planetary Embryos of Terrestrial Planets Early in the Solar System
May 27(Sat), 2017
Associate Professor Ryoji Tanaka and Professor Eizo Nakamura of the Institute for Planetary Materials at Okayama University have separated a spherical particle called a chondrule from an enstatite chondrite, a kind of primordial meteorite that is considered to be a fragment of an astronomical body formed early in the formation period of the Solar System, and have succeeded in conducting a high precision oxygen isotope ratio analysis of the chondrule. They have shown that the oxygen isotopic compositions of terrestrial planets and protoplanets that underwent differentiation processes were determined by a reaction between olivine-rich chondrule and silicon monoxide (SiO)-rich gas. This reaction occurred within a few million years of the birth of the Solar System, as the inner solar protoplanetary disk changed to a reductive environment. Their research results will be published online in the British scientific journal “Nature Astronomy” at 4 pm on May 26th (midnight on the 27th in Japan).
These research results not only make the oxidation-reduction status of the inner solar protoplanetary disk clear in a material scientific way, but also offer important knowledge in understanding the chemical compositions of terrestrial planets as well as planet interior chemical compositions.
Journal: Nature Astronomy
Title: Silicate–SiO reaction in a protoplanetary disk recorded by oxygen isotopes in chondrules
Authors: Ryoji Tanaka & Eizo Nakamura
Year of Publication: 2017
Article number: 0137
Okayama University Silicon Valley Office (OUSVO)
Contact: Mototaka Senda, Ph.D.
- Solar System, chondrule, solar protoplanetary