TY - JOUR
T1 - Precometary organic matter
T2 - A hidden reservoir of water inside the snow line
AU - Nakano, Hideyuki
AU - Hirakawa, Naoki
AU - Matsubara, Yasuhiro
AU - Yamashita, Shigeru
AU - Okuchi, Takuo
AU - Asahina, Kenta
AU - Tanaka, Ryo
AU - Suzuki, Noriyuki
AU - Naraoka, Hiroshi
AU - Takano, Yoshinori
AU - Tachibana, Shogo
AU - Hama, Tetsuya
AU - Oba, Yasuhiro
AU - Kimura, Yuki
AU - Watanabe, Naoki
AU - Kouchi, Akira
N1 - Funding Information:
We thank Dr. T. Yoshizawa and Mr. T. Hirose, Global Facility Center, Hokkaido University for performing mass analysis of oil and aqueous products. The authors thank four anonymous reviewers for constructive comments. This study was carried out under the Joint Research Program of the Institute for Planetary Materials, Okayama University and the Institute of Low Temperature Science, Hokkaido University. This work was supported by the Ministry of Education, Culture, Sports, Science, and Technology Grants-in-Aid for Scientific Research (KAKENHI; grant JP25108002), and by the Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research (KAKENHI; grant JP17H06087).
Publisher Copyright:
© 2020, The Author(s).
PY - 2020/12/1
Y1 - 2020/12/1
N2 - 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.
AB - 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.
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U2 - 10.1038/s41598-020-64815-6
DO - 10.1038/s41598-020-64815-6
M3 - Article
C2 - 32385395
AN - SCOPUS:85084289592
SN - 2045-2322
VL - 10
JO - Scientific reports
JF - Scientific reports
IS - 1
M1 - 7755
ER -