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Impacto oblicuo: un proceso para obtener muestras de meteoritos de otros planetas.
Science (New York, N.Y.)
|October 17, 1986
Resumen
Las simulaciones de impacto muestran que los chorros de vapor de los impactos de asteroides en Marte pueden impulsar los meteoritos SNC. Estos chorros, generados en ángulos y velocidades específicas, pueden acelerar las rocas marcianas para escapar de la velocidad, explicando potencialmente los orígenes de los meteoritos.
Área de la Ciencia:
- Ciencias planetarias Ciencias planetarias.
- El cráter de impacto es el cráter de impacto.
- La geofísica es la geofísica.
Sus antecedentes:
- Los meteoritos SNC se encuentran en la Tierra, pero se originan en Marte.
- Sus bajos niveles de choque y altas velocidades de eyección plantean un desafío para las teorías de origen del impacto.
Objetivo del estudio:
- Para investigar si los chorros de vapor generados por el impacto pueden lanzar meteoritos SNC desde Marte.
- Determinar las condiciones bajo las cuales tal mecanismo es factible.
Principales métodos:
- Cálculos bidimensionales de diferencias finitas de los impactos de proyectiles de silicato en una superficie de silicato.
- Modelado de la dinámica del penacho de vapor y arrastre de los materiales de la superficie.
Principales resultados:
- Los impactos oblicuos (25-60 grados) a 7,5 km/s producen chorros de vapor con velocidades de hasta 20 km/s.
- Estos chorros tienen densidades de 0.1-1 g/cm3 y fluyen paralelamente a la superficie.
- Los chorros de vapor pueden arrastrar y acelerar las rocas superficiales a velocidades que exceden la velocidad de escape de Marte (>5 km/s).
Conclusiones:
- Los chorros de vapor generados por el impacto proporcionan un mecanismo viable para expulsar meteoritos SNC de Marte.
- Este proceso satisface las restricciones de bajo impacto y alta velocidad de eyección para los meteoritos SNC.
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