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Una antigua dinamo de núcleo en el asteroide Vesta.

Roger R Fu1, Benjamin P Weiss, David L Shuster

  • 1Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA. rogerfu@mit.edu

Science (New York, N.Y.)
|October 16, 2012
PubMed
Resumen

Vesta, el asteroide diferenciado más pequeño, probablemente tenía un núcleo metálico y un campo magnético dinamo hace 3.690 millones de años. Este antiguo campo magnético protegía a Vesta de la intemperie espacial, como lo demuestra la magnetización de los meteoritos.

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Área de la Ciencia:

  • Ciencias planetarias Ciencias planetarias.
  • La geofísica es la geofísica.
  • Cosmoquímica es la cosmoquímica.

Sus antecedentes:

  • Vesta es el cuerpo planetario diferenciado más pequeño.
  • Existe incertidumbre con respecto a la formación de Vesta de núcleos metálicos y campos magnéticos dinamo.

Objetivo del estudio:

  • Para investigar la generación temprana del campo magnético de Vesta.
  • Para determinar si Vesta poseía un núcleo metálico líquido advector.

Principales métodos:

  • Análisis de la magnetización remanente en el meteorito de eucrita A81001 de Allan Hills.
  • Datación paleomagnética de la adquisición de la magnetización durante el enfriamiento de Vesta.

Principales resultados:

  • La magnetización remanente indica un campo magnético superficial de al menos 2 microteslas en Vesta hace 3.690 millones de años.
  • El campo magnético probablemente se originó a partir de restos de la corteza terrestre, lo que sugiere una dinamo anterior.
  • Los campos inferidos de la corteza terrestre explican la ausencia de los efectos meteorológicos de los iones del viento solar.

Conclusiones:

  • Vesta probablemente formó un núcleo metálico líquido advector.
  • Una dinamo temprana generó un campo magnético significativo en Vesta.
  • El campo magnético de Vesta jugó un papel crucial en la evolución de su superficie.