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Precometary organic matter: A hidden reservoir of water inside the snow line

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Title: Precometary organic matter: A hidden reservoir of water inside the snow line
Authors: Nakano, Hideyuki Browse this author
Hirakawa, Naoki Browse this author
Matsubara, Yasuhiro Browse this author
Yamashita, Shigeru Browse this author
Okuchi, Takuo Browse this author
Asahina, Kenta Browse this author
Tanaka, Ryo Browse this author
Suzuki, Noriyuki Browse this author
Naraoka, Hiroshi Browse this author
Takano, Yoshinori Browse this author
Tachibana, Shogo Browse this author
Hama, Tetsuya Browse this author
Oba, Yasuhiro Browse this author
Kimura, Yuki Browse this author →KAKEN DB
Watanabe, Naoki Browse this author →KAKEN DB
Kouchi, Akira Browse this author →KAKEN DB
Issue Date: 8-May-2020
Publisher: Nature Publishing Group
Journal Title: Scientific reports
Volume: 10
Issue: 1
Start Page: 7755
Publisher DOI: 10.1038/s41598-020-64815-6
Abstract: The origin and evolution of solar system bodies, including water on the Earth, have been discussed based on the assumption that the relevant ingredients were simply silicates and ices. However, large amounts of organic matter have been found in cometary and interplanetary dust, which are recognized as remnants of interstellar/precometary grains. Precometary organic matter may therefore be a potential source of water; however, to date, there have been no experimental investigations into this possibility. Here, we experimentally demonstrate that abundant water and oil are formed via the heating of a precometary-organic-matter analog under conditions appropriate for the parent bodies of meteorites inside the snow line. This implies that H2O ice is not required as the sole source of water on planetary bodies inside the snow line. Further, we can explain the change in the oxidation state of the Earth from an initially reduced state to a final oxidized state. Our study also suggests that petroleum was present in the asteroids and is present in icy satellites and dwarf planets.
Type: article
Appears in Collections:低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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