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Luz reflejada por granos de arena en la zona terrestre de un disco protoplanetario
William Herbst1, Catrina M Hamilton, Katherine LeDuc
1Astronomy Department, Wesleyan University, Middletown, Connecticut 06459, USA. wherbst@wesleyan.edu
Nature
|March 14, 2008
Resumen
Los granos de polvo interestelar crecen rápidamente a tamaños milimétricos en la zona terrestre de los sistemas estelares jóvenes. Las observaciones del sistema estelar binario KH 15D revelan estos granos más grandes, cruciales para la formación de planetas.
Área de la Ciencia:
- Ciencias planetarias Ciencias planetarias.
- La astrofísica es la astrofísica.
- Astrobiología Astrobiología.
Sus antecedentes:
- La formación de planetas terrestres comienza con la coagulación del polvo interestelar en los discos protoplanetarios.
- Los granos de polvo crecen desde micrómetros hasta milímetros (arena), centímetros (peñascos) o metros (piedras).
- Los discos evolucionados con granos grandes son difíciles de observar debido a sus bajas relaciones entre superficie y volumen.
Objetivo del estudio:
- Para investigar el crecimiento de granos en la zona terrestre de una estrella de 3 millones de años.
- Comprender las primeras etapas de la formación planetaria en los discos protoplanetarios evolucionados.
- Para complementar los estudios interferométricos de discos más jóvenes y resolubles.
Principales métodos:
- Observaciones del sistema estelar binario KH 15D.
- Utilizando la geometría fortuita del sistema para la observación del disco.
- Inferir el tamaño del grano basado en la apariencia del disco durante la ocultación estelar.
Principales resultados:
- Evidencia de granos de tamaño milimétrico o más grandes dentro de aproximadamente 3 unidades astronómicas (UA) de la estrella central.
- El polvo observado sugiere que se ha producido un crecimiento significativo de los granos.
- El disco fue observado como un anillo casi en el borde iluminado por un componente binario.
Conclusiones:
- Las zonas de formación de planetas terrestres pueden albergar granos grandes en sistemas estelares relativamente jóvenes.
- Los hallazgos proporcionan información sobre las etapas iniciales de la formación de planetas terrestres.
- Este estudio mejora nuestra comprensión de la evolución del polvo en los discos protoplanetarios.
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