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Mineralogía y petrología del cometa 81P/Wild 2 muestras de núcleos del cometa 81P/Wild 2

Michael E Zolensky¹, Thomas J Zega, Hajime Yano

¹Astromaterials Research and Exploration Science, NASA Johnson Space Center, Houston, TX 77058, USA. michael.e.zolensky@nasa.gov

Science (New York, N.Y.)

|December 16, 2006

Resumen

Las muestras del cometa Wild 2 revelan una mezcla de granos de construcción débil, lo que indica diversas condiciones de formación y una mínima alteración acuosa. Una partícula refractaria sugiere un transporte radial temprano en el disco protoplanetario.

Área de la Ciencia:

Cosmoquímica es la cosmoquímica.
Ciencias planetarias Ciencias planetarias.
Ciencia de los Cometas Ciencia de los Cometas

Sus antecedentes:

Las muestras de cometas proporcionan información directa sobre los primeros materiales del sistema solar.
La misión Stardust devolvió muestras del cometa 81P/Wild 2, ofreciendo una ventana única a su composición.

Objetivo del estudio:

Para analizar las características mineralógicas y de composición de las muestras del cometa 81P/Wild 2.
Para inferir las condiciones de formación y la historia evolutiva del cometa Wild 2.

Principales métodos:

Análisis de muestras de cometas devueltos utilizando microscopía y espectroscopia avanzadas.
Caracterización de tamaños de grano, composiciones minerales y ensamblajes químicos.

Principales resultados:

Las muestras del cometa Wild 2 están compuestas principalmente de granos de escala nanométrica de agregación débil.
Los granos más grandes incluyen silicatos de ferromagnesio, sulfuros de Fe-Ni y metal Fe-Ni.
Los amplios rangos de composición en olivino y piroxeno sugieren diversas ubicaciones de formación.
Las composiciones de sulfuro restringidas y la ausencia de fases hidrosas indican una alteración acuosa limitada.
Una partícula refractaria sugiere el transporte radial dentro del disco protoplanetario.

Conclusiones:

El cometa Wild 2 se formó bajo una amplia gama de condiciones, probablemente en diferentes regiones del disco protoplanetario.
El cometa experimentó mínima o ninguna alteración acuosa.
La presencia de material refractario apunta a importantes procesos de transporte radial en el sistema solar temprano.

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