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Extenso hielo de agua dentro del regolito acuoso alterado de Ceres: evidencia de la espectroscopia nuclear
T H Prettyman1, N Yamashita2, M J Toplis3
1Planetary Science Institute, 1700 East Fort Lowell, Suite 106, Tucson, AZ 85719-2395, USA. prettyman@psi.edu.
Science (New York, N.Y.)
|December 17, 2016
Resumen
La composición elemental de la superficie del planeta enano Ceres revela un contenido significativo de hielo de agua, lo que indica una alteración acuosa pasada y una posible fraccionamiento de roca de hielo. Esto sugiere la supervivencia a largo plazo del hielo bajo la superficie.
Área de la Ciencia:
- Ciencias planetarias
- Astrogeología
- Astroquímica
Sus antecedentes:
- La composición de la superficie del planeta enano Ceres proporciona información clave sobre su historia geológica y su contenido volátil.
- Comprender la composición del regolito es crucial para descifrar la alteración acuosa y los procesos de evolución interior.
Objetivo del estudio:
- Para determinar la composición elemental de la superficie (hidrógeno, hierro, potasio) de Ceres.
- Para restringir el contenido de hielo de regolito de Ceres y el historial de alteración acuosa.
- Para investigar la fraccionamiento potencial de la roca de hielo y la evolución interior.
Principales métodos:
- Análisis de los datos de espectroscopia nuclear de la misión Dawn de la NASA.
- Cuantificación de las concentraciones elementales en la superficie de Ceres.
Principales resultados:
- Los materiales de la superficie muestran evidencia de procesamiento acuoso dentro del interior de Ceres.
- El regolito con carbono de Ceres tiene altas concentraciones de hidrógeno pero menores de hierro en comparación con las condritas carbonáceas.
- Las altas concentraciones de hidrógeno en latitudes medias a altas indican abundante hielo de agua subterránea.
Conclusiones:
- La composición de la superficie de Ceres sugiere que se produjo una modesta fraccionamiento de roca de hielo.
- El hielo de agua subterránea está muy extendido y probablemente ha sobrevivido durante miles de millones de años.
- Los hallazgos apoyan los modelos teóricos de la estabilidad del hielo en Ceres.
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