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Contaminación del cinturón de asteroides por objetos transneptunianos primordiales
Harold F Levison1, William F Bottke, Matthieu Gounelle
1[1] Southwest Research Institute, 1050 Walnut Street, Suite 300, [2] Center for Lunar Origin & Evolution, NASA Lunar Science Institute, Boulder, Colorado 80302, USA.
Nature
|July 17, 2009
Resumen
La migración de planetas gigantes insertó objetos primitivos en el cinturón de asteroides, lo que explica su diversa composición. Estos cuerpos capturados son una fuente importante de micrometeoritos primitivos.
Área de la Ciencia:
- Ciencias planetarias Ciencias planetarias.
- La astronomía es la astronomía.
- La astrofísica es la astrofísica.
Sus antecedentes:
- El cinturón principal de asteroides exhibe diversos objetos, desde rocas heladas hasta rocas ígneas.
- Los modelos actuales sugieren que los asteroides se formaron in situ dentro de un disco primordial químicamente variado.
Objetivo del estudio:
- Para investigar el origen de la diversidad del cinturón de asteroides.
- Para probar la influencia de la dinámica orbital del planeta gigante en la composición de los asteroides.
Principales métodos:
- Simuló la evolución dinámica de las órbitas de los planetas gigantes utilizando el modelo de Niza.
- Rastreó la inserción de objetos transneptunianos en el cinturón exterior de asteroides.
Principales resultados:
- La migración de planetas gigantes del modelo de Niza inserta objetos transneptunianos primitivos en el cinturón de asteroides externo.
- Esto explica la diversidad observada sin requerir variación intrínseca de composición en el disco protoplanetario.
- Los cuerpos capturados, ricos en orgánico, contribuyen significativamente a las poblaciones de micrometeoritos, lo que explica su naturaleza primitiva e isotópicamente distinta.
Conclusiones:
- La diversidad del cinturón de asteroides está significativamente influenciada por la entrega de material externo.
- La dinámica de los planetas gigantes juega un papel crucial en la configuración de la composición de los cuerpos del sistema solar interior.
- El origen de los meteoritos primitivos está vinculado a objetos transneptunianos capturados.
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