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Terreno abarrotado en Vesta e implicaciones para la presencia de volátiles
B W Denevi1, D T Blewett, D L Buczkowski
1The Johns Hopkins University Applied Physics Laboratory, Laurel, MD, USA. brett.denevi@jhuapl.edu
Science (New York, N.Y.)
|September 22, 2012
Resumen
El inusual terreno con hoyos en el asteroide Vesta sugiere que los impactos liberaron volátiles subterráneos. Esto indica que Vesta conserva materiales de impacto, como las condritas carbonáceas, que influyen en su geología.
Área de la Ciencia:
- Ciencias planetarias Ciencias planetarias.
- Geología de los asteroides Geología de los asteroides
- El cráter de impacto es el cráter de impacto.
Sus antecedentes:
- El asteroide Vesta exhibe un terreno agujereado único cerca de cráteres de impacto.
- Esta morfología difiere de las características de otros cuerpos sin aire.
- Pozos similares en Marte están vinculados a la desgasificación volátil desencadenada por impactos.
Objetivo del estudio:
- Para investigar el origen del terreno agujereado distintivo de Vesta.
- Para determinar si la liberación volátil inducida por el impacto es responsable de estas características.
- Evaluar el papel de los materiales exógenos en la evolución de la superficie de Vesta.
Principales métodos:
- Análisis de imágenes de alta resolución de la nave espacial Dawn.
- Comparación morfológica del terreno agujereado de Vesta con cráteres marcianos.
- Inferencia de la composición del subsuelo basada en las características geológicas observadas.
Principales resultados:
- El terreno con hoyos en Vesta comparte similitudes con los hoyos generados por el impacto marciano.
- El mecanismo de formación probablemente implica la desgasificación de materiales volátiles ricos en gases.
- La evidencia sugiere una preservación significativa de los materiales exógenos (impactor) en Vesta.
Conclusiones:
- El terreno agujereado de Vesta probablemente se formó por el calentamiento del impacto y la posterior desgasificación de los volátiles subterráneos.
- Esto implica que la superficie de Vesta contiene un componente volátil sustancial, posiblemente de impactos de condritas carbonáceas.
- La composición del impactador y su preservación local son factores clave en la configuración de las características geológicas de Vesta.
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