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Posibles lagos tropicales en Titán a partir de las observaciones del terreno oscuro
Caitlin A Griffith1, Juan M Lora, Jake Turner
1Lunar and Planetary Laboratory, University of Arizona, Tucson, Arizona 85721, USA. griffith@lpl.arizona.edu
Nature
|June 16, 2012
Resumen
El titán Titan es un titán.
Área de la Ciencia:
- Ciencias planetarias Ciencias planetarias.
- Astrobiología Astrobiología.
- Ciencias de la atmósfera Ciencias atmosféricas.
Sus antecedentes:
- Titán posee características similares a las de la Tierra, como nubes, lluvia y lagos, pero está compuesto de metano.
- La mayor parte del metano de Titán es atmosférico, con líquido superficial detectado solo en latitudes altas.
- Las regiones tropicales de Titán se caracterizan por campos de dunas, no por líquidos superficiales.
Objetivo del estudio:
- Para investigar la presencia y el origen del metano líquido de superficie en las regiones de baja latitud de Titán.
- Para analizar los datos espectrales para comprender la composición y las características de las características de la superficie de Titán.
- Para conciliar la distribución observada del líquido superficial con los modelos atmosféricos.
Principales métodos:
- Análisis de imágenes espectrales del infrarrojo cercano que cubren latitudes de 20°N a 20°S.
- Identificación de las regiones con el flujo espectral superficial más bajo en siete bandas de longitud de onda.
- Aplicación de análisis de transferencia radiativa para interpretar las propiedades espectrales de la superficie.
Principales resultados:
- Se identificó una región oval persistente (60 × 40 km2) con un flujo espectral excepcionalmente bajo entre 20°N y 20°S.
- La firma espectral de esta región es consistente con una superficie negra, lo que indica la presencia de metano líquido.
- Este hallazgo desafía las suposiciones anteriores sobre la distribución del líquido superficial en Titán.
Conclusiones:
- Los perdurables lagos de baja latitud en Titán probablemente son suministrados por fuentes subterráneas, reabastecidas en los últimos 10.000 años.
- Estas fuentes subterráneas pueden ser el origen del metano atmosférico de Titán.
- La reposición continua de metano es crucial para mantener la química orgánica de Titán a través de procesos fotoquímicos.
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