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Los chorros de vapor de agua dentro del penacho de gas que sale de Encelado
C J Hansen1, L W Esposito, A I F Stewart
1Jet Propulsion Laboratory/California Institute of Technology, Pasadena, California 91109, USA. candice.j.hansen@jpl.nasa.gov
Nature
|November 28, 2008
Resumen
Las columnas de vapor de agua de Saturno provienen de Saturno.
Área de la Ciencia:
- Ciencias planetarias Ciencias planetarias.
- Astrobiología Astrobiología.
- La geofísica es la geofísica.
Sus antecedentes:
- Encélado, una luna de Saturno, exhibe penachos de vapor de agua de su región polar sur.
- Las fuerzas de marea influyen en las fisuras y la liberación de vapor de agua del océano interno de Encélado.
- Comprender la composición y la densidad del penacho es clave para estudiar el control de las mareas de la ventilación.
Objetivo del estudio:
- Para analizar la densidad y las características de la pluma de vapor de agua de Encelado.
- Para investigar la relación entre las características de las plumas y las tensiones de las mareas.
- Para apoyar o refutar las hipótesis sobre el origen de la pluma y los mecanismos de aceleración.
Principales métodos:
- Observación de una ocultación estelar por el penacho de Encelado el 24 de octubre de 2007.
- Análisis de chorros de gas de alta densidad dentro del penacho de fondo.
- Medición de la densidad de la columna de agua y las velocidades de los chorros.
Principales resultados:
- Se detectaron cuatro chorros de gas de alta densidad, coincidiendo con chorros de polvo previamente reportados.
- La densidad de la columna de agua observada fue aproximadamente el doble de la de las mediciones anteriores.
- La relación entre las velocidades verticales y térmicas (1.5 +/- 0.2) soporta una fuente de agua líquida y la aceleración supersónica del gas.
Conclusiones:
- La densidad de pluma observada excede las predicciones, lo que indica una dinámica de ventilación compleja.
- Los hallazgos apoyan la hipótesis de que el agua líquida estalla a través de canales en forma de boquilla.
- Las plumas de Encélado proporcionan información crucial sobre la actividad del océano subterráneo y las interacciones de las mareas.
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