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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
PubMed
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.

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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.