Hydrothermal experiments and chemical evolution model for icy bodies in the Solar system: Implications for formation of the Solar system and habitability

• Project/Area Number: 26707024
• Research Category: Grant-in-Aid for Young Scientists (A)
• Allocation Type: Partial Multi-year Fund
• Research Field: Solid earth and planetary physics
• Research Institution: The University of Tokyo
• Principal Investigator: Sekine Yasuhito 東京大学, 理学(系)研究科(研究院), 准教授 (60431897)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Project Status: Completed (Fiscal Year 2016)
• Budget Amount: ¥24,830,000 (Direct Cost: ¥19,100,000、Indirect Cost: ¥5,730,000); Fiscal Year 2016: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2015: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000); Fiscal Year 2014: ¥21,580,000 (Direct Cost: ¥16,600,000、Indirect Cost: ¥4,980,000)
• Keywords: 氷天体 / 化学進化 / 熱水環境 / 原始太陽系円盤 / 太陽系天体 / 内部海 / 惑星化学 / 惑星起源・進化 / 地球化学 / 惑星探査 / 惑星科学 / 宇宙化学

Outline of Final Research Achievements

The present study aims at understanding water environments (redox, pH, temperature) and habitability within interior oceans of geologically-active icy bodies in the Solar system, based on laboratory experiments and spacecraft observations. We have constrained chemical conditions and rock compositions of hydrothermal environments within Enceladus. We further suggest the occurence of large-scale planetary migrations at the early stage of the Solar system from the interpretations of surface materials on Ceres and Pluto.

Research Products

• [Int'l Joint Research] ハイデルベルグ大学/シュトゥッツガルト大学(ドイツ)
• [Int'l Joint Research] コロラド大学(米国)
• [Int'l Joint Research] ハイデルベルグ大学/シュトゥッツガルト大学(ドイツ)
• [Int'l Joint Research] コロラド大学(米国)
• [Int'l Joint Research] 素粒子核物理研究所(ハンガリー)
• [Int'l Joint Research] 欧州宇宙機関（ESA）(スペイン)
• [Journal Article] The Charon-forming giant impact as a source of Pluto's equatorial dark regions (2017)
  • Author(s): Sekine, Y., H. Genda, S. Kamata, T. Funatsu
  • Journal Title: Nature Astronomy Volume: 1 Issue: 2 Pages: 1-6
  • DOI: 10.1038/s41550-016-0031
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] An automated method for crater counting using rotational pixel swapping method (2017)
  • Author(s): Yamamoto, S., T. Matsunaga, R. Nakamura, Y. Sekine, N. Hirata, Y. Yamaguchi
  • Journal Title: IEEE transaction on geoscience and remote sensing Volume: 印刷中
  • Peer Reviewed
• [Journal Article] Experimental Study on Growth of Organic Aerosol in Reducing Planetary Atmospheres (2016)
  • Author(s): 洪鵬, 関根康人, 杉田精司
  • Journal Title: Earozoru Kenkyu Volume: 31 Issue: 3 Pages: 185-191
  • DOI: 10.11203/jar.31.185
  • NAID: 130005421160
  • ISSN: 0912-2834, 1881-543X
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] High-temperature water-rock interactions and hydrothermal environments in the chondrite-like core of Enceladus (2015)
  • Author(s): Sekine, Y., Shibuya, T., Postberg, F., Hsu, H.-W., Suzuki, K., Masaki, Y., Kuwatani, T., Mori, M., Hong, P.K., Yoshizaki, M., Tachibana, S., Sirono, S.
  • Journal Title: Nature Communications Volume: 6 Issue: 1 Pages: 1-8
  • DOI: 10.1038/ncomms9604
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Transition to an oxygen-rich atmosphere with an extensive overshoot triggered by the Paleoproterozoic snowball Earth (2015)
  • Author(s): Harada, M., E. Tajika, Y. Sekine
  • Journal Title: Earth and Planetary Science Letters Volume: 419 Pages: 178-186
  • DOI: 10.1016/j.epsl.2015.03.005
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Ongoing hydrothermal activities within Enceladus (2015)
  • Author(s): Hsu, H-W., F. Postberg, Y. Sekine, T. Shibuya, S. Kempf, M. Horanyi, A. Juhasz, N. Altobelli, K. Suzuki, Y. Masaki, T. Kuwatani, S. Tachibana, S. Sirono, G. Moragas-Klostermeyer, R. Srama
  • Journal Title: Nature Volume: 519 Issue: 7542 Pages: 207-219
  • DOI: 10.1038/nature14262
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Rotational pixel swapping method for detection of circular features in binary images (2015)
  • Author(s): Yamamoto, S., T. Matsunaga, R. Nakamura, Y. Sekine, N. Hirata, Y. Yamaguchi
  • Journal Title: IEEE Transactions on Geoscience and Remote Sensing Volume: 53 Issue: 2 Pages: 710-723
  • DOI: 10.1109/tgrs.2014.2327121
  • Peer Reviewed
• [Journal Article] Impact chemistry of methanol: Implications for volatile evolution on icy satellites and dwarf planets, and cometary delivery to the Moon (2014)
  • Author(s): Sekine, Y., H. Genda, Y. Muto, S. Sugita, T. Kadono, T. Matsui
  • Journal Title: Icarus Volume: 243 Pages: 39-47
  • DOI: 10.1016/j.icarus.2014.08.034
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Exploration of Enceladus' water-rich plumes toward understanding of chemistry and biology of the interior ocean (2014)
  • Author(s): Sekine, Y., Y. Takano, H. Yano, R. Funase, K. Takai, M. Ishihara, T. Shibuya, S. Tachibana, K. Kuramoto, H. Yabuta, J. Kimura, Y. Furukawa
  • Journal Title: Transactions of the Japan Society for Aeronautical and Space Sciences, Aerospace Technology Japan Volume: 12 Pages: 7-11
  • NAID: 130004548657
  • Peer Reviewed
• [Journal Article] Formation and geomorphologic history of the Lonar impact crater deduced from in situ cosmogenic 10Be and 26Al (2014)
  • Author(s): Nakamura, A., Yokoyama, Y., Sekine, Y., Goto, K., Komatsu, G., Kumar, P.S., Matsuzaki, H., Kaneoka, I., Matsui, T.
  • Journal Title: Geochemistry, Geophysics, Geosystems Volume: 15 Issue: 8 Pages: 3190-3197
  • DOI: 10.1002/2014gc005376
  • Peer Reviewed
• [Presentation] Low-CO2 atmosphere on early Mars? An interpretation of manganese oxide on Gale crater by laboratory experiments (2017)
  • Author(s): Noda, N., S. Imamura, Y. Sekine, H. Tabata, S. Uesugi, T. Murakami, Y. Takahashi
  • Organizer: Lunar and Planetary Science Conference 2017
  • Place of Presentation: Marriott Hotel and Convention Center, The Woodlands, Texas, USA
  • Year and Date: 2017-03-20
  • Int'l Joint Research
• [Presentation] Neutral pH ocean on Ceres: Implications for formation temperature of Ceres in the protoplanetary disk (2016)
  • Author(s): Sekine, Y., T. Shibuya, Y. Aikawa
  • Organizer: American Geophysical Union Fall meeting 2016
  • Place of Presentation: Moscone Center, San Francisco, California, USA
  • Year and Date: 2016-12-12
  • Int'l Joint Research
• [Presentation] Runaway acidification of surface water on early Mars in response to atmospheric evolution (2016)
  • Author(s): Sekine, Y., H. Tabata
  • Organizer: Asian Oceanian Geoscience Conference 2016
  • Place of Presentation: China National Convention Center, Beijing, China
  • Year and Date: 2016-07-31
  • Int'l Joint Research
• [Presentation] Neutral pH of water on early Ceres (2016)
  • Author(s): Sekine, Y., T. Shibuya, Y. Aikawa, T. Funatsu
  • Organizer: Goldschmidt Conference 2016
  • Place of Presentation: パシフィコ横浜、横浜市、神奈川県
  • Year and Date: 2016-06-26
  • Int'l Joint Research
• [Presentation] 木星氷衛星探査衛星 JUICE - 日本がJUICEで目指すサイエンス (2016)
  • Author(s): 関根康人、木村淳、佐々木晶、生駒大洋、笠井康子、並木則之、浅村和史、笠羽康正、高橋幸弘、齋藤義文、藤本正樹、JUICE-日本チーム
  • Organizer: 宇宙科学シンポジウム
  • Place of Presentation: 宇宙科学研究所（神奈川県相模原市）
  • Year and Date: 2016-01-06
• [Presentation] Can a Charon-forming giant impact produce enlongated dark areas on Pluto? (2015)
  • Author(s): Sekine, Y., H. Genda, T. Funatsu
  • Organizer: AGU fall meeting
  • Place of Presentation: Moscone Center, USA
  • Year and Date: 2015-12-14
  • Int'l Joint Research
• [Presentation] 冥王星の黒いクジラ模様はカロン形成巨大衝突の痕跡か？ (2015)
  • Author(s): 関根康人、玄田英典、舟津太郎
  • Organizer: 日本惑星科学会秋季講演会
  • Place of Presentation: 東京工業大学（東京都目黒区）
  • Year and Date: 2015-10-15
• [Presentation] 比較惑星海洋学とハビタビリティ (2015)
  • Author(s): 関根康人
  • Organizer: 日本地球化学会年会
  • Place of Presentation: 横浜国立大学（神奈川県横浜市）
  • Year and Date: 2015-09-16
  • Invited
• [Presentation] Enceladus' ongoing hydrothermal activity and issures for future explorations (2015)
  • Author(s): Sekine, Y.
  • Organizer: MISASA V International symposium
  • Place of Presentation: ブランナール三朝（鳥取県東伯郡三朝町）
  • Year and Date: 2015-03-06
  • Int'l Joint Research
• [Presentation] Ongoing hydrothermal activity in the chondritic core of Enceladus inferred from nano-silica particles and laboratory experiments (2014)
  • Author(s): Sekine, Y., F. Postberg, H.-W. Hsu, T. Shibuya, K. Suzuki, Y. Masaki, T. Kuwatani, S. Tachibana, S. Sirono
  • Organizer: American Geophysical Union (AGU) fall meeting
  • Place of Presentation: Moscone Center, USA
  • Year and Date: 2014-12-15
  • Int'l Joint Research / Invited
• [Presentation] Observations and science of Galilean satellites by JUICE-SWI (Submillimeter Wave Instrument) (2014)
  • Author(s): Sekine, Y., Y. Kasai, H. Sagawa, T. Kuroda, K. Kodama, Y. Hori, M. Ikoma, K. Kuramoto, H. Yurimoto
  • Organizer: JpGU Annual meeting 2014
  • Place of Presentation: パシフィコ横浜（神奈川県横浜市）
  • Year and Date: 2014-04-28