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Evidencia de crecimiento de granos de polvo en discos circumestelares jóvenes
H B Throop1, J Bally, L W Esposito
1Laboratory for Atmospheric and Planetary Sciences, University of Colorado, Boulder, CO 80309-0392, USA. throop@boulder.swri.edu
Science (New York, N.Y.)
|April 28, 2001
Resumen
Los discos planetarios jóvenes en la nebulosa de Orión están siendo destruidos por una intensa radiación. A pesar de esto, la evidencia sugiere que la formación de planetas puede haber comenzado, con granos de polvo que crecen en partículas más grandes antes de la disipación del disco.
Área de la Ciencia:
- La astronomía es la astronomía.
- La astrofísica es la astrofísica.
- Ciencias planetarias Ciencias planetarias.
Sus antecedentes:
- Los discos circumestelares son cruciales para la formación de planetas.
- La intensa radiación ultravioleta (UV) de las estrellas masivas cercanas tiene un impacto significativo en los discos protoplanetarios.
- La nebulosa de Orión alberga numerosos objetos estelares jóvenes con discos circumestelares.
Objetivo del estudio:
- Para investigar la supervivencia de los discos circumestelares jóvenes en la nebulosa de Orión bajo intensa radiación UV.
- Para determinar si las etapas iniciales de la formación de planetas (crecimiento de granos de polvo) pueden ocurrir en estos entornos irradiados.
- Para modelar la evolución de los granos en discos protoplanetarios irradiados externamente.
Principales métodos:
- Análisis observacional de los discos circunestelares en la nebulosa de Orión.
- Desarrollo de un modelo teórico para la evolución de los granos en discos protoplanetarios irradiados.
Principales resultados:
- La evidencia observacional confirma la presencia de partículas grandes dentro de los discos circumestelares de Orión.
- El modelo desarrollado predice una rápida evolución del tamaño de las partículas.
- El modelo también predice límites agudos del disco externo debido a la irradiación externa.
Conclusiones:
- La formación de planetas, específicamente el crecimiento de granos de polvo, puede iniciarse en los discos circumestelares incluso bajo una severa irradiación UV.
- El ambiente de intensa radiación en la nebulosa de Orión influye en la estructura del disco y potencialmente en la escala de tiempo para la formación de planetas.
- Comprender estos procesos es clave para determinar las tasas de formación de sistemas planetarios en entornos similares.
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