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Composiciones isotópicas de oxígeno de materiales asteroidales devueltos desde Itokawa por la misión Hayabusa
Hisayoshi Yurimoto1, Ken-ichi Abe, Masanao Abe
1Natural History Sciences, Hokkaido University, Sapporo 060-0810, Japan. yuri@ep.sci.hokudai.ac.jp
Science (New York, N.Y.)
|August 27, 2011
Resumen
Los investigadores descubrieron que la composición isotópica de oxígeno del asteroide Itokawa coincide con la de ciertos meteoritos. Esto proporciona evidencia directa que vincula a los asteroides con las condritas primitivas, avanzando nuestra comprensión de la formación del sistema solar.
Área de la Ciencia:
- Cosmoquímica es la cosmoquímica.
- Ciencias planetarias Ciencias planetarias.
- Geología Geología Geología.
Sus antecedentes:
- Los objetos del sistema solar poseen composiciones isotópicas únicas de oxígeno.
- Se cree que las condritas, meteoritos primitivos, se originan en los asteroides.
- Las composiciones isotópicas de oxígeno de los asteroides se mantuvieron en gran medida sin establecer.
Objetivo del estudio:
- Para determinar la composición isotópica de oxígeno del asteroide 25143 Itokawa.
- Para establecer un vínculo directo entre los asteroides y los meteoritos condríticos.
Principales métodos:
- Se utilizó la espectrometría de masas de iones secundarios para el análisis de isótopos de oxígeno.
- El análisis se realizó en partículas de roca devueltas del asteroide 25143 Itokawa por la nave espacial Hayabusa.
Principales resultados:
- Se midieron las composiciones de isótopos de oxígeno de las partículas de Itokawa.
- Estas composiciones están agotadas en oxígeno-16 en comparación con los materiales terrestres.
- La composición de Itokawa se alinea con las condritas ordinarias del grupo LL o L.
Conclusiones:
- El asteroide 25143 Itokawa es una fuente potencial de condritas ordinarias del grupo LL o L.
- Este estudio establece un vínculo directo de isótopos de oxígeno entre un asteroide progenitor y las condritas.
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