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Ciencia de los cometas. 67P/Churyumov-Gerasimenko, un cometa de la familia de Júpiter con una alta relación D/H
K Altwegg1, H Balsiger2, A Bar-Nun3
1Physikalisches Institut, University of Bern, Sidlerstrasse 5, CH-3012 Bern, Switzerland. altwegg@space.unibe.ch.
Science (New York, N.Y.)
|December 16, 2014
Resumen
El cometa 67P/Churyumov-Gerasimenko tiene una relación deuterio-hidrógeno (D/H) tres veces mayor que el valor oceánico de la Tierra. Este hallazgo sugiere que los cometas pueden no ser la única fuente de agua de la Tierra.
Área de la Ciencia:
- Ciencias planetarias Ciencias planetarias.
- La astroquímica es astroquímica.
- Ciencia de los Cometas Ciencia de los Cometas
Sus antecedentes:
- El origen del agua y los compuestos orgánicos de la Tierra sigue siendo un importante debate científico.
- Las proporciones de deuterio a hidrógeno (D/H) en los cometas y los océanos son trazadores isotópicos clave para la procedencia del agua planetaria.
Objetivo del estudio:
- Para medir directamente la relación D/H en el cometa de la familia de Júpiter 67P/Churyumov-Gerasimenko.
- Para comparar las relaciones D / H cometarias con los océanos de la Tierra para restringir los escenarios de origen del agua.
Principales métodos:
- Medición in situ de la relación D/H utilizando el espectrómetro de masas ROSINA.
- Análisis de los datos de la misión de la nave espacial Rosetta de la Agencia Espacial Europea.
Principales resultados:
- Se midió que la relación D/H en el cometa 67P/Churyumov-Gerasimenko fue de (5.3 ± 0.7) × 10(-4).
- Este valor es aproximadamente tres veces la relación D / H que se encuentra en los océanos de la Tierra.
Conclusiones:
- La amplia gama de relaciones D / H observadas en los cometas de la familia de Júpiter desafía la noción de que son la única fuente del agua del océano de la Tierra.
- La composición de agua de los cometas es más diversa de lo que se suponía anteriormente, lo que requiere una reevaluación de su papel en la formación de planetas terrestres.
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