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Showing 1–6 of 6 results
Advanced filters: Author: Takazo Shibuya Clear advanced filters

  • 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
    Research
    Nature
    Volume: 646, P: 62-67

  • Cassini’s Cosmic Dust Analyzer mass spectra of ice grains emitted by Enceladus show the presence of sodium phosphates, suggesting that phosphorus is readily available in Enceladus’s ocean in the form of orthophosphates.

    • Frank Postberg
    • Yasuhito Sekine
    • Shuya Tan
    ResearchOpen Access
    Nature
    Volume: 618, P: 489-493

  • Observations indicate that the southern hemisphere of Enceladus is geologically active, with spray containing Si nanoparticles being ejected from an underground ocean. Here, the authors report that experiments to constrain reaction conditions suggest the core is similar to that of carbonaceous chondrites.

    • Yasuhito Sekine
    • Takazo Shibuya
    • Sin-iti Sirono
    ResearchOpen Access
    Nature Communications
    Volume: 6, P: 1-8

  • Analysis of silicon-rich, nanometre-sized dust particles near Saturn shows them to consist of silica, which was initially embedded in icy grains emitted from Enceladus’ subsurface waters and released by sputter erosion in Saturn’s E ring; their properties indicate their ongoing formation and transport by high-temperature hydrothermal reactions from the ocean floor and up into the plume of Enceladus.

    • Hsiang-Wen Hsu
    • Frank Postberg
    • Ralf Srama
    Research
    Nature
    Volume: 519, P: 207-210