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El origen de la heterogeneidad de isótopos nucleosintéticos en el disco protoplanetario solar
Anne Trinquier1, Tim Elliott, David Ulfbeck
1Center for Stars and Planets, Natural History Museum of Denmark, University of Copenhagen, Copenhagen DK-1350, Denmark.
Science (New York, N.Y.)
|April 18, 2009
Resumen
Las variaciones correlacionadas de isótopos de titanio revelan que el polvo presolar fue procesado antes de la formación del planeta. Este procesamiento térmico creó heterogeneidad isotópica, impactando la composición de los planetas terrestres.
Área de la Ciencia:
- Ciencias planetarias Ciencias planetarias.
- Cosmoquímica es la cosmoquímica.
- La geoquímica de los isótopos es la geoquímica de los isótopos.
Sus antecedentes:
- Las variaciones de isótopos estables se observan en los materiales del sistema solar interior, pero su importancia sigue sin estar clara.
- Los isótopos de titanio (por ejemplo, titanio-46, titanio-50) poseen orígenes nucleosintéticos distintos.
Objetivo del estudio:
- Para investigar la importancia de las variaciones de isótopos estables en los sólidos del sistema solar interior.
- Para analizar variaciones correlacionadas e independientes de la masa del titanio-46 y el titanio-50.
Principales métodos:
- Análisis masivo de sólidos del sistema solar interior, planetas y asteroides.
- Análisis isotópico centrado en las variaciones de titanio-46 y titanio-50.
Principales resultados:
- Descubrimiento de variaciones correlacionadas e independientes de la masa del titanio-46 y el titanio-50.
- La evidencia sugiere una mezcla inicial de polvo presolar seguida de una modificación isotópica a escala planetaria.
Conclusiones:
- El procesamiento térmico de material presolar, relacionado con el agotamiento de elementos volátiles, destruyó selectivamente componentes anómalos.
- Los planetas terrestres probablemente se acrecentaron a partir de sólidos procesados térmicamente con composiciones isotópicas no solares.
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