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Team identifies parent body materials in Ryugu asteroid

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Team identifies parent body materials in Ryugu asteroid

A single particle from the asteroid Ryugu (named C0009) helps identify the parent body materials of a space object. Credit: A. Yamaguchi / NIPR

An international team including a researcher from Lawrence Livermore National Laboratory (LLNL) has determined that a specific particle on the asteroid Ryugu could shed light on unmodified metamaterials from its parent body.

In December 2014, the Japan Aerospace Exploration Agency launched the Hayabusa2 spacecraft to the asteroid 162173 Ryugu. In December 2020, a sample return capsule successfully landed safely on the ground with pure Ryugu pieces it had collected.

Ryugu is an ancient part of a larger asteroid that formed very early in the history of the solar system, shortly after the birth of the sun. Samples of this asteroid offer a unique opportunity to determine not only what the solar system is made of, but also how the solar system evolved.

The Solar System was formed from a large cloud of swirling gas and dust created by previous generations of stars. This “stellar dust” is nanometers of micrometer-sized particles that are incorporated into planetary bodies, such as Ryugu, when they form.

In the new research, LLNL Secondary Ion Mass Spectrometer and cosmologist Ming-Chang Liu (Department of Nuclear and Chemical Sciences) found that one particle (called C0009) is metallically different from other Ryugu particles because it contains a small amount (~0.5 volume%) of Anhydrous silicates. Other particles studied so far contain more phyllosilicates and carbonates, indicating that Ryugu underwent a large-scale water change on its parent body, similar to rare mineral-modified, but chemically primitive CI chondrites, (a group of rare stony meteorites). ). The search appears in natural astronomy.

Through isotopic analysis of magnesium-rich olive and pyroxene, the data provide “strong evidence that amoebic oil agglomerates and magnesium-rich chondrioles, two types of high-temperature bodies that formed in the solar nebula, accumulated in Ryugu’s parent body,” Liu said. , who served as the first author of the paper.

The team analyzed the results of oxygen isotope measurements of the anhydrous Ryugu silicate, which has strong implications for the origins of Ryugu and then the parent asteroids of the CI chondrite meteorites.

“Oxygen isotope data combined with grain morphology allow us to infer indigenous materials incorporated into the Ryugu protolith because they reveal a possible relationship between the anhydrous silicate in C0009 and other known high-temperature components found in non-CI carbonaceous chondrites,” Liu said. .

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Dust grains from the asteroid Ryugu older than our solar system


more information:
Ming-Chang Liu et al, Incorporation of 16O-rich anhydrous silicate into the highly hydrated asteroid Ryugu protolith, natural astronomy (2022). DOI: 10.1038 / s41550-022-01762-4

Submitted by Lawrence Livermore National Laboratory

the quote: Team identifies parent body materials in asteroid Ryugu (2022, September 23) Retrieved September 23, 2022 from

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