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Las sales de sodio en los granos de hielo de anillo E de un océano debajo de la superficie de Encelado
F Postberg1, S Kempf, J Schmidt
1Institut für Geowissenschaften, Universität Heidelberg, 69120 Heidelberg, Germany. frank.postberg@mpi-hd.mpg.de
Nature
|June 26, 2009
Resumen
El análisis de los granos de los anillos E de Saturno revela un alto contenido de sal de sodio, lo que confirma la existencia de Encélado.
Área de la Ciencia:
- Ciencias Planetarias: Investigando la composición y el origen de los granos del anillo E de la luna de Saturno Encélado.
Sus antecedentes:
- La luna de Saturno Encélado exhibe plumas desde su polo sur, lo que indica un potencial océano subterráneo.
- Estas columnas son la fuente principal de partículas de hielo en el anillo E de Saturno.
- Análisis anteriores sugirieron componentes orgánicos o siliciosos en los granos de pluma, lo que insinúa una interacción entre el núcleo y el agua.
Objetivo del estudio:
- Para determinar si el agua líquida subterránea de Encelado todavía está presente hoy en día.
- Para identificar la composición química de los granos del anillo E para inferir las condiciones de origen de las plumas.
Principales métodos:
- Análisis in situ de granos de hielo de anillo E. Análisis in situ de granos de hielo de anillo E.
- Identificación y cuantificación de los componentes de las sales, específicamente las sales de sodio.
- Comparación de la abundancia de sal observada y el pH inferido con modelos del océano de Encélado.
Principales resultados:
- Se identificó una población de granos de anillo E ricos en sales de sodio (0,5-2% en masa).
- La composición de la sal y el pH básico inferido coinciden estrechamente con las predicciones de que el océano de Encélado interactúa con su núcleo rocoso.
- El sodio atómico no se espera en el vapor de pluma, lo que explica su ausencia en los espectros ópticos.
Conclusiones:
- La presencia de sales de sodio en los granos del anillo E proporciona una fuerte evidencia de la existencia de columnas de agua líquida originarias de Encélado hoy en día.
- La composición de estos granos apoya la hipótesis de un océano subterráneo en Encélado que interactúa con su núcleo rocoso.
- Los hallazgos son consistentes con los modelos actuales del océano interno de Encélado y la generación de penachos.
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