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Detección de carbonatos en capas de polvo alrededor de estrellas evolucionadas
F Kemper1, C Jäger, L B F M Waters
1Astronomical Institute "Anton Pannekoek", University of Amsterdam, Kruislaan 403, 1098 SJ Amsterdam, The Netherlands. ciska@science.uva.nl
Nature
|January 18, 2002
Resumen
Los carbonatos descubiertos en las conchas de polvo estelar evolucionado desafían los orígenes del Sistema Solar. Estos carbonatos extraterrestres se formaron sin agua líquida, lo que sugiere que los procesos no acuosos pueden crearlos, impactando nuestra comprensión de los primeros cuerpos del Sistema Solar.
Área de la Ciencia:
- La astroquímica es astroquímica.
- Ciencias planetarias Ciencias planetarias.
- Cosmoquímica es la cosmoquímica.
Sus antecedentes:
- Los carbonatos en la Tierra y Marte se forman a través del desgaste de silicatos en soluciones acuosas.
- Los carbonatos en los asteroides y el polvo interplanetario a menudo se atribuyen a la alteración acuosa de los cuerpos padres.
- La presencia de carbonatos más allá del Sistema Solar ha permanecido sin confirmar hasta ahora.
Objetivo del estudio:
- Investigar la presencia y los mecanismos de formación de carbonatos fuera del Sistema Solar.
- Para determinar si los carbonatos pueden formarse en ambientes que carecen de agua líquida.
- Reevaluar las implicaciones de los carbonatos del Sistema Solar para la presencia de agua líquida temprana.
Principales métodos:
- Análisis de las capas de polvo que rodean a las estrellas evolucionadas.
- Identificación espectroscópica de los minerales carbonatados (calcita y dolomita).
Principales resultados:
- Descubrimiento de calcita y dolomita en las conchas de polvo de estrellas evolucionadas.
- Estos carbonatos extraterrestres se encontraron en condiciones demasiado primitivas para los grandes cuerpos madre con agua líquida.
- El mecanismo de formación probablemente no sea acuoso, posiblemente involucrando procesos superficiales en granos de polvo / hielo o condensación de la fase gaseosa.
Conclusiones:
- Los carbonatos pueden formarse a través de procesos no acuosos en entornos interestelares.
- La presencia de carbonatos en los cuerpos del Sistema Solar puede no indicar exclusivamente el pasado de agua líquida.
- Este hallazgo amplía la comprensión de las vías de formación de carbonato en el cosmos.
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