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La desgasificación episódica como origen del metano atmosférico en Titán
Gabriel Tobie1, Jonathan I Lunine, Christophe Sotin
1Laboratoire de Planétologie et Géodynamique, UMR-CNRS 6112, Université de Nantes, 44322 Nantes cedex 03, France. gabriel.tobie@univ-nantes.fr
Nature
|March 3, 2006
Resumen
El titán Titan es un titán.
Área de la Ciencia:
- Ciencias planetarias Ciencias planetarias.
- Astrobiología Astrobiología.
- La geoquímica es la geoquímica.
Sus antecedentes:
- La atmósfera de Titán es principalmente nitrógeno con metano.
- El metano atmosférico en Titán se agota por la fotoquímica durante millones de años.
- Las teorías anteriores proponían reservas superficiales de hidrocarburos líquidos para la reposición de metano, pero no se han observado.
Objetivo del estudio:
- Para identificar la fuente de metano atmosférico en la luna de Saturno, Titán.
- Para conciliar la presencia de metano con la ausencia de depósitos de líquido superficial.
Principales métodos:
- Modelado de la desgasificación de metano de los hidratos de clatrato.
- Analizando el estado energético y térmico del interior de Titán.
- Evaluación de los mecanismos de fuentes de metano propuestos frente a los datos de observación.
Principales resultados:
- La desgasificación episódica de metano de los hidratos clatrados dentro de una cáscara helada es la fuente más probable.
- Este modelo explica la ausencia de depósitos de líquidos superficiales.
- También explica el bajo estado de disipación interior de Titán.
Conclusiones:
- El metano en Titán es probablemente suministrado por la desgasificación episódica de los hidratos clatrados subterráneos.
- Las misiones futuras pueden detectar un océano subterráneo, un núcleo rocoso y actividad criovolcánica.
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