A primordial noble gas component discovered in the Ryugu asteroid and its implications

Alexander B. Verchovsky (), Feargus A. J. Abernethy, Mahesh Anand, Ian A. Franchi, Monica M. Grady, Richard C. Greenwood, Simeon J. Barber, Martin Suttle, Motoo Ito, Naotaka Tomioka, Masayuki Uesugi, Akira Yamaguchi, Makoto Kimura, Naoya Imae, Naoki Shirai, Takuji Ohigashi, Ming-Chang Liu, Kentaro Uesugi, Aiko Nakato, Kasumi Yogata, Hayato Yuzawa, Yuzuru Karouji, Satoru Nakazawa, Tatsuaki Okada, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Makoto Yoshikawa, Akiko Miyazaki, Masahiro Nishimura, Toru Yada, Masanao Abe, Tomohiro Usui, Sen-ichiro Watanabe and Yuichi Tsuda
Additional contact information
Alexander B. Verchovsky: The Open University
Feargus A. J. Abernethy: The Open University
Mahesh Anand: The Open University
Ian A. Franchi: The Open University
Monica M. Grady: The Open University
Richard C. Greenwood: The Open University
Simeon J. Barber: The Open University
Martin Suttle: The Open University
Motoo Ito: Kochi Institute for Core Sample Research, X-star, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Nankoku
Naotaka Tomioka: Kochi Institute for Core Sample Research, X-star, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Nankoku
Masayuki Uesugi: Japan Synchrotron Radiation Research Institute (JASRI/SPring-8)
Akira Yamaguchi: National Institute of Polar Research (NIPR)
Makoto Kimura: Kanagawa University
Naoya Imae: Institute for Molecular Science
Naoki Shirai: High Energy Accelerator Research Organization
Takuji Ohigashi: Institute for Molecular Science
Ming-Chang Liu: Lawrence Livermore National Laboratory
Kentaro Uesugi: Japan Synchrotron Radiation Research Institute (JASRI/SPring-8)
Aiko Nakato: National Institute of Polar Research (NIPR)
Kasumi Yogata: Japan Aerospace Exploration Agency (JAXA)
Hayato Yuzawa: Institute for Molecular Science
Yuzuru Karouji: Osaka University, 8-1 Mihogaoka
Satoru Nakazawa: Japan Aerospace Exploration Agency (JAXA)
Tatsuaki Okada: Japan Aerospace Exploration Agency (JAXA)
Takanao Saiki: Japan Aerospace Exploration Agency (JAXA)
Satoshi Tanaka: Japan Aerospace Exploration Agency (JAXA)
Fuyuto Terui: Japan Aerospace Exploration Agency (JAXA)
Makoto Yoshikawa: Japan Aerospace Exploration Agency (JAXA)
Akiko Miyazaki: Japan Aerospace Exploration Agency (JAXA)
Masahiro Nishimura: Japan Aerospace Exploration Agency (JAXA)
Toru Yada: Japan Aerospace Exploration Agency (JAXA)
Masanao Abe: Japan Aerospace Exploration Agency (JAXA)
Tomohiro Usui: Japan Aerospace Exploration Agency (JAXA)
Sen-ichiro Watanabe: Nagoya University
Yuichi Tsuda: Japan Aerospace Exploration Agency (JAXA)

Nature Communications, 2024, vol. 15, issue 1, 1-11

Abstract: Abstract Ryugu is the C-type asteroid from which material was brought to Earth by the Hayabusa2 mission. A number of individual grains and fine-grained samples analysed so far for noble gases have indicated that solar wind and planetary (known as P1) noble gases are present in Ryugu samples with concentrations higher than those observed in CIs, suggesting the former to be more primitive compared to the latter. Here we present results of analyses of three fine-grained samples from Ryugu, in one of which Xe concentration is an order of magnitude higher than determined so far in other samples from Ryugu. Isotopically, this Xe resembles P1, but with a much stronger isotopic fractionation relative to solar wind and significantly lower 36Ar/132Xe ratio than in P1. This previously unknown primordial noble gas component (here termed P7) provides clues to constrain how the solar composition was fractionated to form the planetary components.

Date: 2024
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DOI: 10.1038/s41467-024-52165-0

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