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Formación de cóndrulos por colisiones de planetesimales que contienen volátiles provocados por la formación de

Sin-Iti Sirono1, Diego Turrini2

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Las colisiones entre planetesimales que contienen materiales volátiles explican la formación de cóndrulos. La formación de Júpiter desencadenó estos impactos, produciendo derretimiento de silicatos dispersos por el gas, coincidiendo con los tamaños de cóndula y las tasas de enfriamiento.

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Área de la Ciencia:

  • Ciencias planetarias
  • Cosmoquímica
  • La astrofísica

Sus antecedentes:

  • Las condrulas son componentes clave de los meteoritos condríticos, que proporcionan información sobre los primeros procesos del sistema solar.
  • Los tamaños de cóndula observados y las tasas de enfriamiento son difíciles de conciliar con los modelos de formación existentes.
  • La comprensión de la formación de cóndrulos es crucial para la datación del sistema solar temprano y la comprensión de la formación de planetas.

Objetivo del estudio:

  • Proponer y validar numéricamente un nuevo modelo para la formación de condrules.
  • Para explicar los tamaños característicos y las tasas de enfriamiento de los cóndrulos.
  • Para vincular la formación del cóndulo con las primeras etapas de la formación de Júpiter y la nebulosa solar.

Principales métodos:

  • Simulaciones numéricas de colisiones planetarias de alta velocidad.
  • Modelado de la generación y dispersión de silicatos fundidos por expansión de gases impulsados por volátiles.
  • Análisis de las tasas de producción de fusión relacionadas con la acreción de gas de Júpiter.

Principales resultados:

  • Las colisiones de alta velocidad (> 2 km / s) de planetesimales ricos en volátiles generan una fusión significativa de silicatos.
  • El gas en expansión de los volátiles calentados se dispersa y enfría la fusión, formando gotas del tamaño de una cóndula.
  • El pico de producción de fusión se correlaciona con el inicio de la acumulación de gas fuera de control de Júpiter.

Conclusiones:

  • Las colisiones planetesimales proporcionan un mecanismo natural para la formación de cóndrulos, explicando sus propiedades observadas.
  • La formación de la cóndula proporciona un marcador temporal, lo que sugiere que Júpiter se formó aproximadamente 1.8 millones de años después de las inclusiones ricas en calcio y aluminio (CAI).
  • Este modelo concilia las características del cóndrulo con la dinámica temprana del sistema solar y la línea de tiempo de formación de Júpiter.