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Descubrimiento de dos jóvenes enanas marrones en un sistema binario eclipsante
Keivan G Stassun1, Robert D Mathieu, Jeff A Valenti
1Department of Physics and Astronomy, Vanderbilt University, Nashville, Tennessee 37235, USA. keivan.stassun@vanderbilt.edu
Nature
|March 17, 2006
Resumen
Descubrimos un sistema binario de enanas marrones, proporcionando mediciones directas de estos.
Área de la Ciencia:
- La astronomía y la astrofísica.
- Formación estelar y planetaria Formación estelar y planetaria
Sus antecedentes:
- Las enanas marrones cierran la brecha entre las estrellas y los planetas.
- Las propiedades fundamentales de las enanas marrones están poco restringidas.
- Comprender la formación de enanas marrones es clave para la formación de estrellas y planetas.
Objetivo del estudio:
- Para medir directamente la masa y el radio de las enanas marrones recién formadas.
- Para investigar las propiedades de las enanas marrones en un sistema binario eclipsante.
- Para probar modelos teóricos de la evolución de las enanas marrones.
Principales métodos:
- Descubrimiento de una enana marrón eclipsando el sistema binario en la Nebulosa de Orión.
- Medición directa de la masa y el radio utilizando el sistema binario eclipsante.
- Comparación de las propiedades observadas con las predicciones teóricas.
Principales resultados:
- Las masas medidas son: 0.054 ± 0.005 M (o) y 0.034 ± 0.003 M (o).
- Los radios medidos fueron: 0.669 ± 0.034 R (o) y 0.511 ± 0.026 R (o).
- Se observó que la enana marrón menos masiva es más caliente, lo que contradice los modelos.
Conclusiones:
- Las mediciones directas confirman el estatus de enana marrón y revelan tamaños estelares.
- Los resultados desafían los modelos teóricos actuales de la evolución de las enanas marrones contemporáneas.
- Proporciona datos cruciales para refinar las teorías de la formación de objetos subestelares.
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