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Detección de ozono en Ganímedes
K S Noll1, R E Johnson, A L Lane
1Space Telescope Science Institute, Baltimore, MD 21218, USA.
Science (New York, N.Y.)
|July 19, 1996
Resumen
El ozono (O3) fue detectado en Ganímedes usando el Telescopio Espacial Hubble. Este hallazgo sugiere una atmósfera O3-O2 atrapada dentro de la superficie helada de Ganímedes.
Área de la Ciencia:
- Ciencias planetarias Ciencias planetarias.
- Astrobiología Astrobiología.
- La espectroscopia es una técnica de espectroscopia.
Sus antecedentes:
- Ganímedes, la luna más grande de Júpiter, posee una tenue atmósfera.
- Observaciones anteriores han detectado oxígeno molecular (O2) en el último hemisferio de Ganímedes.
Objetivo del estudio:
- Para detectar y caracterizar el ozono (O3) en Ganímedes.
- Investigar el origen y el estado de las especies atmosféricas detectadas.
Principales métodos:
- Utilizó el Telescopio Espacial Hubble para observar una banda de absorción a 260 nm.
- Analizó la banda de Hartley del ozono (O3) para determinar su abundancia y propiedades.
Principales resultados:
- Detectó una banda de absorción de ozono, identificándola como la banda de Hartley.
- Se midió una abundancia de columna de ozono de 4,5 x 1016 moléculas por centímetro cuadrado.
- Inferido una relación de ozono a oxígeno ([O3]/[O2]) entre 10^-4 y 10^-3.
Conclusiones:
- El ozono y el oxígeno observados probablemente forman una "atmósfera" atrapada en la superficie dentro del hielo de Ganímedes.
- Las características espectrales de la banda de ozono apoyan su confinamiento en hielo en lugar de un estado gaseoso.
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