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Glóbulos orgánicos en el meteorito del lago Tagish: restos del disco protosolar
Keiko Nakamura-Messenger1, Scott Messenger, Lindsay P Keller
1Robert M. Walker Laboratory for Space Science, Astromaterials Research and Exploration Science Directorate, NASA Johnson Space Center, Houston, TX 77058, USA. keiko.nakamura-1@nasa.gov
Science (New York, N.Y.)
|December 2, 2006
Resumen
Los glóbulos orgánicos en el meteorito del lago Tagish revelan anomalías isotópicas extremas. Estos hallazgos sugieren que la materia orgánica extraterrestre se formó en ambientes fríos y tempranos del sistema solar, similar a las partículas cometarias.
Área de la Ciencia:
- Cosmoquímica es la cosmoquímica.
- Astrobiología Astrobiología.
- Ciencias planetarias Ciencias planetarias.
Sus antecedentes:
- Los meteoritos proporcionan información crucial sobre la composición del sistema solar temprano.
- La materia orgánica en los meteoritos ofrece pistas sobre la química prebiótica.
Objetivo del estudio:
- Para investigar el origen y las condiciones de formación de glóbulos orgánicos encontrados en el meteorito del lago Tagish.
- Determinar la composición isotópica de la materia orgánica para comprender sus orígenes extraterrestres.
Principales métodos:
- Microscopía electrónica de transmisión coordinada (TEM) y mediciones isotópicas.
- Análisis de las proporciones de nitrógeno-15 a nitrógeno-14 y deuterio a hidrógeno en glóbulos orgánicos.
Principales resultados:
- Los glóbulos orgánicos exhiben proporciones significativamente elevadas de nitrógeno-15/nitrógeno-14 y deuterio/hidrógeno en comparación con los valores terrestres.
- Las anomalías isotópicas indican la formación por fraccionamiento de masa a temperaturas extremadamente bajas (10-20 K).
- La composición se asemeja a las partículas cometarias de carbono, hidrógeno, oxígeno y nitrógeno (CHON).
Conclusiones:
- Los glóbulos orgánicos probablemente se formaron como recubrimientos de hielo procesados fotoquímicamente en granos en nubes moleculares frías o en el disco protosolar externo.
- Estos hallazgos sugieren que los granos presolares, procesados en materia orgánica refractaria, fueron componentes significativos del sistema solar temprano.
- El estudio apoya la hipótesis de que el material parecido a un cometa contribuyó al inventario orgánico del sistema solar.
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