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Los isótopos de xenón en 67P/Churyumov-Gerasimenko muestran que los cometas contribuyeron a la atmósfera de la Tierra
B Marty1, K Altwegg2,3, H Balsiger2
1Centre de Recherches Pétrographiques et Géochimiques, CNRS, Université de Lorraine, 15 rue Notre Dame des Pauvres, BP 20, 54501 Vandoeuvre lès Nancy, France. bmarty@crpg.cnrs-nancy.fr.
Science (New York, N.Y.)
|June 10, 2017
Resumen
El cometa 67P/Churyumov-Gerasimenko
Área de la Ciencia:
- Ciencias planetarias
- Cosmoquímica
- Astrobiología
Sus antecedentes:
- El origen del material cometario y su papel en la formación de las atmósferas interiores de los planetas siguen siendo cuestiones científicas clave.
- Comprender la composición de los cometas proporciona información sobre el sistema solar temprano.
Objetivo del estudio:
- Para analizar la composición isotópica del xenón en el coma del cometa 67P/Churyumov-Gerasimenko.
- Para determinar la contribución del xenón cometario a la atmósfera de la Tierra.
Principales métodos:
- El instrumento Rosetta Orbiter Spectrometer para el análisis iónico y neutro (ROSINA) a bordo de la nave espacial Rosetta fue utilizado.
- Las órbitas de baja altitud permitieron un análisis detallado de los gases cometarios.
Principales resultados:
- Los isótopos de xenón en el cometa 67P/Churyumov-Gerasimenko mostraron déficits en isótopos pesados.
- La firma isotópica coincide con un componente atmosférico primordial.
Conclusiones:
- Los cometas potencialmente contribuyeron significativamente a la formación de la atmósfera de la Tierra.
- Aproximadamente el 22% del xenón atmosférico de la Tierra se origina en fuentes cometarias, junto con el xenón cóndrico.
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