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Filosilicatos amoniados con un probable origen en el Sistema Solar exterior en (1) Ceres
M C De Sanctis1, E Ammannito1,2, A Raponi1
1Istituto di Astrofisica e Planetologia Spaziali, INAF, Via del Fosso del Cavaliere 100, 00133 Roma, Italy.
Nature
|December 15, 2015
Resumen
Los espectros del planeta enano Ceres revelan filosilicatos amoniacados extendidos, no hielo de agua detectable. Esto sugiere que el material del Sistema Solar exterior se incorporó a Ceres durante su formación o más tarde.
Área de la Ciencia:
- Ciencias planetarias
- Astrobiología
- Minerología
Sus antecedentes:
- Se debate la composición de la superficie del planeta enano Ceres, con análogos propuestos que incluyen condritas carbonáceas CI y CM.
- Estudios anteriores sugirieron agua en minerales de arcilla, filosilicatos amoniacados o brucita en la superficie de Ceres.
- Los datos espectrales limitados impidieron la identificación definitiva de los materiales de superficie, especialmente en el rango de 2,5 a 2,9 micrómetros.
Objetivo del estudio:
- Para investigar la composición de la superficie del planeta enano Ceres utilizando nuevos datos espectrales.
- Para identificar minerales y volátiles específicos presentes en la superficie de Ceres.
- Para entender el origen y la evolución de los materiales de Ceres.
Principales métodos:
- Adquisición de espectros de Ceres en el rango de longitud de onda de 0,4 a 5 micrómetros.
- Las mediciones se tomaron desde diferentes distancias, desde ~ 82,000 km hasta 4,300 km de la superficie.
- Análisis de datos espectrales para identificar las firmas mineralógicas.
Principales resultados:
- Se detectaron filosilicatos amoniacados generalizados en toda la superficie de Ceres.
- No se encontró hielo detectable en la superficie.
- El amoníaco puede haber reaccionado con filosilicatos durante la diferenciación de Ceres.
Conclusiones:
- La composición de la superficie de Ceres está dominada por filosilicatos amoniacados, lo que desafía las hipótesis previas de hielo de agua extendido.
- La presencia de amoníaco sugiere la incorporación de material del sistema solar exterior en Ceres.
- Esto implica la formación a una gran distancia heliocéntrica o una acreción posterior de material volátil.
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