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Scattering And Absorption of Light in Planetary Regoliths
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Objetos similares a las condrulas en el cometa de corto período 81P/Wild 2
Tomoki Nakamura1, Takaaki Noguchi, Akira Tsuchiyama
1Department of Earth and Planetary Science, Faculty of Science, Kyushu University, Hakozaki, Fukuoka 812-8581, Japan. tomoki@geo.kyushu-u.ac.jp
Science (New York, N.Y.)
|September 20, 2008
Resumen
Las muestras de la misión Stardust revelan partículas cristalinas del cometa 81P/Wild 2 que se formaron a través de fusión rápida a alta temperatura. Estos objetos parecidos a cóndrulos sugieren que el material del sistema solar temprano estaba ampliamente distribuido.
Área de la Ciencia:
- Cosmoquímica es la cosmoquímica.
- Ciencias planetarias Ciencias planetarias.
- Astrogeología y Astrogeología.
Sus antecedentes:
- La misión Stardust devolvió muestras del cometa 81P/Wild 2.
- Estas muestras contienen material cristalino de origen desconocido.
- Se cree que las condrulas, partículas dominantes en las condritas, se forman en la nebulosa solar interna.
Objetivo del estudio:
- Para investigar el origen y la naturaleza del material cristalino en muestras cometarias.
- Para comparar partículas cometarias con materiales conocidos del sistema solar como cóndrulos.
- Comprender la distribución y los procesos de formación de los primeros materiales del sistema solar.
Principales métodos:
- Análisis de cuatro partículas cristalinas del cometa 81P/Wild 2.
- Análisis textural, mineralógico y de composición.
- Análisis de isótopos de oxígeno.
Principales resultados:
- Cuatro partículas cristalinas exhiben características similares a las condrulas.
- Estas partículas se formaron a través de la fusión instantánea a alta temperatura.
- Las composiciones de los isótopos de oxígeno se alinean con las cóndrulas de las cóndritas carbonáceas.
Conclusiones:
- Las partículas cometarias pueden ser similares a las cóndrulas que se encuentran en los meteoritos.
- Los procesos de alta temperatura ocurrieron en la nebulosa solar externa.
- Objetos parecidos a cóndrulos fueron transportados desde el interior al exterior del sistema solar, lo que indica una amplia distribución del material del sistema solar temprano.
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