Formation of solar system in two stages


Internal terrestrial protoplanets grow quickly, acquire substantial amounts of radioactive 26Al, and therefore melt, form iron cores, and rapidly decrease their primordial volatile abundance. Planets in the outer solar system begin to exit later and with less radiative heat, and therefore retain the majority of their initially emitted volcanoes. Sincerely: Mark A. Garlick / markgarlick.com

An international team of researchers from the University of Oxford, LMU Munich, ETH Zurich, BGI Bayreuth and the University of Zurich found that the two-step formation process of the early solar system could explain the chronology and split into unstable and isotopic materials. Inner and outer solar system.

Their findings will be published Science.

The paper presents a new theoretical framework for the formation and structure of the solar system that explains terrestrial planets (such as Earth, Venus, and Mars), the outer solar system (like Jupiter), and several key features of the structure of asteroids and meteorites. Can. family. The team’s work combines recent advances in astronomy (namely observations of other solar systems during their formation) and meteorites – laboratory experiments and analyzes on isotopes, iron, and water content in meteorites.

The suggested combination of astronomical and geophysical phenomena during the initial formation phase of the Sun and the Solar System can only explain why the planets in the inner solar system are small and dry with mass, while the planets in the outer solar system are large and wet. There is a lot of water. It interprets the meteorite record by forming planets in two distinct phases. Internal terrestrial protoplanets quickly became accustomed and heated internally by strong radioactive decay; This left them dry and internal, divided by a population of outer, wet planets. Additionally there are many implications for the distribution of planets like Earth and the necessary formation conditions in planetary planets.







Video introduction to the main concepts of research. Credit: Tim Lichtenberg

Numerical experiments conducted by the interdisciplinary team revealed that the onset of accretion in the inner solar system and the relative chronology of longer periods and the later end of the outer solar system and more rapid accretion may be explained by two different formation epochs. Planets, the building blocks of planets. Recent observations of planet-forming disks have shown that the disc midplane, where planets are formed, may have relatively low levels of turbulence. Under such conditions, there is an interaction between disc gas and dust grains in the water around the orbital space, where it transitions from the gas to the ice phase (snow line), forming an initial formation in the inner solar system. May trigger bursts and another later and further.

Two distinct formation episodes of planetary populations, which move material from nearby disks and occur through mutual collisions, result in different geophysical modes of development intrinsic to the protoplanet. Dr. from the Department of Atmospheric, Oceanic and Planetary Physics at Oxford University. Tim Lichtenberg and lead author of the study notes: “The different formation time intervals of these planetary populations mean that their internal heat engines differ sufficiently for radioactive decay. The inner solar system planetariums became very hot, the interior Magma oceans evolved, quickly formed iron cores, and destroyed their initial volatile material, eventually resulting in dry planetary compositions. By comparison, planetariums of the outer solar system were formed later and so they formed internal Formally experienced low internal heat. Hence limited iron core formation, and unstable release.

“The early formed and dry inner solar system and the later formed and wet outer solar system were set on two different development paths very early in their history. This opens up new avenues for understanding the origins of Earth’s early atmosphere . The location of the solar system in the context of exoplanetary census like planets and across the galaxy. “

This research was supported by funding from The Origins of Life, the Swiss National Science Foundation and the Simons collaboration of the European Research Council.

A full study, “Dividing the building blocks of planets during solar system construction,” will be published on 22 January 2021. Science, 371, 6527.


Reconstruction of original architecture of solar system


more information:
“Bifurcation of planetary building blocks during solar system construction” Science (2021). science.sciencemag.org/cgi/doi… 1126 / science.abb3091

Provided by the University of Oxford

Quotes: Formation of Solar System in two phases (2021, 21 January) Retrieved 22 January 2021 from https://phys.org/news/2021-01-solar-formation.html

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