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천문우주과학 연구동향

천문우주과학과 관련된 국내외 상위 학술논문 및 특허 정보를 제공해 드립니다.

엔켈라투스 상에서 현재도 진행되고 있는 열수 활성

Ongoing hydrothermal activities within Enceladus
  • 작성자 : KASI
  • 작성일 : 2015-03-13
  • 조회수 : 2502
  • 저자Hsiang-Wen Hsu, Frank Postberg et,.al
  • Absract

     

    Detection of sodium-salt-rich ice grains emitted from the plume of the Saturnianmoon Enceladus suggests that the grains formed as frozen droplets froma liquid water reservoir that is, or has been, in contact with rock. Gravitational field measurements suggest a regional south polar subsurface ocean of about 10 kilometres thickness located beneath an ice crust 30 to 40 kilometres thick. These findings imply rock–water interactions in regions surrounding the core of Enceladus.The resulting chemical ‘footprints’ are expected to be preserved in the liquid and subsequently transported upwards to the near-surface plume sources, where they eventually would be ejected and could be measured by a spacecraft. Here we report an analysis of silicon-rich, nanometre-sized dust particles(so-called stream particles) that stand out fromthe water-ice-dominated objecs characteristic of Saturn. We interpret these grains as nanometre-sized SiO2 (silica) particles, initially in icy grains emitted from Enceladus’ subsurface waters and released by sputter erosion in Saturn’s E ring. The composition and the limited size range (2 to 8 nanometres in radius) of stream particles indicate ongoing hightemperature (.90 6C) hydrothermal reactions associated with global- scale geothermal activity that quickly transports hydrothermal products from the ocean floor at a depth of at least 40 kilometres up to the plume of Enceladus.
     

     


  • 게재정보NATURE(2015.03.11)에 게재된 논문임
  • 첨부파일
  • 원 문http://www.nature.com/nature/journal/v519/n7542/pdf/nature14262.pdf
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