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Sistema solar temprano. el sistema solar temprano. Acreción temprana de agua en el sistema solar interior a partir de

Adam R Sarafian¹, Sune G Nielsen², Horst R Marschall³

¹Department of Geology and Geophysics, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, USA. asarafian@whoi.edu.

Science (New York, N.Y.)

|November 1, 2014

Resumen

Los asteroides ricos en agua como Vesta entregaron volátiles esenciales a la Tierra temprana. Este hallazgo sugiere que la Tierra es la Tierra.

Área de la Ciencia:

Ciencias planetarias Ciencias planetarias.
Astrobiología Astrobiología.
La geoquímica es la geoquímica.

Sus antecedentes:

Comprender el origen y el momento de la acumulación de agua en el sistema solar interior es crucial para las teorías de formación de planetas.
El momento de la entrega de agua impacta los modelos de la aparición de la vida temprana en la Tierra.

Objetivo del estudio:

Para investigar la composición isotópica de hidrógeno de la apatita en meteoritos de eucrita del asteroide 4 Vesta.
Para determinar si Vesta representa un antiguo depósito de hidrógeno relevante para el inventario volátil de la Tierra.

Principales métodos:

Mediciones in situ de la composición isotópica del hidrógeno.
Análisis de muestras de minerales de apatita dentro de meteoritos de eucrita.

Principales resultados:

Vesta exhibe la misma composición isotópica de hidrógeno que las condritas carbonáceas.
Los meteoritos de Eucrita, originarios de Vesta, poseen antiguos depósitos de hidrógeno.
Existen similitudes isotópicas en hidrógeno, carbono y nitrógeno entre Vesta y la Tierra.

Conclusiones:

Los volátiles, incluida el agua, podrían haberse acumulado temprano en la Tierra.
Esto desafía la noción de que los volátiles se adquieren exclusivamente durante una fase de adquisición tardía.
Vesta sirve como un análogo potencial para la entrega temprana de volátiles a planetas terrestres.

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