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Una composición isotópica pobre en 15N para el sistema solar, como se muestra en las muestras de viento solar de
B Marty1, M Chaussidon, R C Wiens
1Centre de Recherches Pétrographiques et Géochimiques (CRPG), Nancy Université, Vandoeuvre-lès-Nancy, France. bmarty@crpg.cnrs-nancy.fr
Science (New York, N.Y.)
|June 25, 2011
Resumen
La misión Génesis encontró que el nitrógeno del viento solar se agota en nitrógeno-15 (15N). Esto revela variaciones isotópicas extremas en el sistema solar temprano, lo que explica los materiales empobrecidos con 15N que se encuentran en otros lugares.
Área de la Ciencia:
- Cosmoquímica es la cosmoquímica.
- Ciencias planetarias Ciencias planetarias.
- La astrofísica es la astrofísica.
Sus antecedentes:
- La composición isotópica del nitrógeno en el sistema solar es poco conocida.
- El viento solar proporciona una muestra del Sol y la nebulosa protosolar.
- La misión de Génesis tenía como objetivo analizar las composiciones elementales e isotópicas del viento solar.
Objetivo del estudio:
- Para determinar la relación nitrógeno-15/nitrógeno-14 (15N/14N) en el nitrógeno del viento solar.
- Para investigar el origen de las variaciones isotópicas de nitrógeno en el sistema solar.
- Para caracterizar la composición isotópica de nitrógeno de la nebulosa protosolar.
Principales métodos:
- Análisis de los isótopos de nitrógeno implantados en los materiales objetivo del concentrador de viento solar Genesis.
- Espectrometría de masas para mediciones precisas de la relación isotópica.
Principales resultados:
- El nitrógeno del viento solar exhibe una relación de 15N/14N de 2,18 ± 0,02 × 10−3,3.
- Esta relación es aproximadamente un 40% más baja en 15N en comparación con la atmósfera de la Tierra.
- Se ha determinado que la relación 15N/14N de la nebulosa protosolar es de 2,27 ± 0,03 × 10−3, la más baja conocida en el sistema solar.
Conclusiones:
- El sistema solar primitivo poseía una extrema heterogeneidad isotópica de nitrógeno.
- El viento solar empobrecido de 15N representa los componentes empobrecidos de 15N que se encuentran en otros materiales del sistema solar.
- Este hallazgo proporciona información crucial sobre la evolución química del sistema solar naciente.
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