The article reported, "Schiller and his colleagues made the finding by studying
iron isotopes, or different versions of the element iron, in meteorite dust. After looking at iron isotopes in different types of meteorites, they realized that only one type had an iron profile that was similar to Earth's: the CI chondrites, which are stony meteorites. (The "C" stands for carbonaceous and the "I" stands for Ivuna, a place in Tanzania where some CI meteorites are found.) The dust in these CI chondrites is the best approximation out there for the solar system's overall composition, the researchers said. In the solar system's early days, dust like this joined with gas and both were funneled into a accretion disk orbiting the growing sun. Over the course of 5 million years, the solar system's planets formed. According to the new study, the proto-Earth's iron core also formed during this time, snatching up accreted iron from the proto-planet's mantle. Eventually, this proto-planet became the Earth we know today."
I am reviewing different reports on this important accretion disk model for the proto-earth. Theia, the impactor with the proto-earth that created the Moon in the Giant Impact Model, the computer code likely will need some tweaks
In the giant impact model, the proto-earth was 65% of the present mass and size, other computer simulations about 90% and more than 5 million years old. The new study shows the accretion disk last only about 5E+6 years, so the planets must form quickly.
Iron Isotope Evidence for Very Rapid Accretion and Differentiation of the Proto-Earth , "Instead, the iron isotope signature of the mantle is consistent with a very rapid main accretion and differentiation of the Earth that occurred during the ~5 Myr disk lifetime."
This is a very short lifetime for the accretion disk used to explain the origin of the planets in our solar system. In 1999, studies showed T Tauri stars contained perhaps 332-333 earth masses in their *protoplanetary disks*,
The Leonard Award Address: On the Difficulties of Making Earth-Like Planets
More recent (2020) computer simulations used in the accretion disk modeling for the origin of the solar system, the inputs use a one solar mass star, and more than 39,000 earth masses for the accretion disk,
Dispersal of protoplanetary discs by the combination of magnetically driven and photoevaporative winds, "We start simulations from the early phase in which the disc mass is 0.118 M_{☉ } around a 1 M_{☉ } star and track the evolution until the disc is completely dispersed."
Today in the ecliptic that telescope users can see and study, there is about 447 earth masses documented from Mercury to Pluto. This new 5E+6 years lifetime starts to place real constraints on origin modeling for our solar system using the spinning, accretion disk approach.