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Showing 1–12 of 12 results

Advanced filters: Author: Sachiko Amari Clear advanced filters

The isotopic compositions and stellar sources of meteoritic graphite grains

Sachiko Amari
Peter Hoppe
Roy S. Lewis
Research28 Oct 1993
Nature

Volume: 365, P: 806-809
Large amounts of extinct²⁶AI in interstellar grains from the Murchison meteorite

Ernst Zinner
Sachiko Amari
Roy Lewis
Research03 Jan 1991
Nature

Volume: 349, P: 51-54
Search for the origin of exotic helium in deep-sea sediments

Sachiko Amari
Minoru Ozima
Research01 Oct 1985
Nature

Volume: 317, P: 520-522
Meteoritic silicon carbide: pristine material from carbon stars

Roy S. Lewis
Sachiko Amari
Edward Anders
Research22 Nov 1990
Nature

Volume: 348, P: 293-298
Interstellar graphite in meteorites

Sachiko Amari
Edward Anders
Ernst Zinner
Research17 May 1990
Nature

Volume: 345, P: 238-240
Erratum: Meteoritic silicon carbide: pristine material from carbon stars

Roy S. Lewis
Sachiko Amari
Edward Anders
Amendments and Corrections14 Mar 1991
Nature

Volume: 350, P: 174
History of individual presolar SiC grains revealed by stellar winds

Origin of abundant noble gases in presolar silicon carbide (SiC) grains is under debate. Here, the authors measure 3D maps of helium within the SiC grains and reveal that these noble gases are evidence of hot stellar wind irradiation from central stars of planetary nebulae.

Ken-ichi Bajo
Tatsuki Izumi
Hisayoshi Yurimoto
ResearchOpen Access14 Oct 2025
Nature Communications

Volume: 16, P: 1-11
Late fluid flow in a primitive asteroid revealed by Lu–Hf isotopes in Ryugu

Analysis of samples from the asteroid Ryugu provide evidence of late fluid flow in a carbonaceous asteroid, indicating that such bodies may have retained two to three times more water than previously thought.

Tsuyoshi Iizuka
Takazo Shibuya
Hisayoshi Yurimoto
Research10 Sept 2025
Nature

Volume: 646, P: 62-67
Laboratory evidence for co-condensed oxygen- and carbon-rich meteoritic stardust from nova outbursts

Carbon-rich and oxygen-rich material coexist in a presolar grain originated by an outburst of a CO nova and found within the LaPaz Icefield 031117 meteorite. Condensation of both carbon and oxygen can thus happen in the same circumstellar environment, contrary to previous assumptions.

Pierre Haenecour
Jane Y. Howe
Atsushi Muto
Research29 Apr 2019
Nature Astronomy

Volume: 3, P: 626-630
Contribution of Ryugu-like material to Earth’s volatile inventory by Cu and Zn isotopic analysis

A comparison of copper and zinc isotopic measurements between the Ryugu samples and various carbonaceous chondrites excludes any genetic link between the two except for the CI (Ivuna-type) chondrites. Ryugu-like material might have accounted for ~5% of Earth’s mass.

Marine Paquet
Frederic Moynier
Hisayoshi Yurimoto
Research12 Dec 2022
Nature Astronomy

Volume: 7, P: 182-189
Carbonate record of temporal change in oxygen fugacity and gaseous species in asteroid Ryugu

The asteroid Ryugu experienced aqueous alteration under changing temperature and redox conditions, according to an isotopic analysis of secondary calcite and dolomite grains in samples from Ryugu obtained by the Hayabusa2 spacecraft.

Wataru Fujiya
Noriyuki Kawasaki
Hisayoshi Yurimoto
Research10 Jul 2023
Nature Geoscience

Volume: 16, P: 675-682
Author Correction: Contribution of Ryugu-like material to Earth’s volatile inventory by Cu and Zn isotopic analysis

Marine Paquet
Frederic Moynier
Hisayoshi Yurimoto
Amendments and Corrections14 Mar 2023
Nature Astronomy

Volume: 7, P: 633