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La polvorienta atmósfera de la enana marrón Gliese 229B, también conocida como Gliese 229B
C A Griffith1, R V Yelle, M S Marley
1Department of Physics and Astronomy, Northern Arizona University, Flagstaff, AZ 86011-6010, USA.
Science (New York, N.Y.)
|December 16, 1998
Resumen
La enana marrón Gliese 229B es también una enana marrón.
Área de la Ciencia:
- La astronomía y la astrofísica.
- Ciencia exoplanetaria Ciencia de los exoplanetas.
- Ciencias de la atmósfera Ciencias atmosféricas.
Sus antecedentes:
- Las enanas marrones como Gliese 229B poseen atmósferas con condiciones de temperatura únicas.
- Estas condiciones son demasiado cálidas para las nubes de hielo y demasiado frías para las nubes de silicato, a diferencia de Júpiter o las estrellas de baja masa.
- Esto permite una observación atmosférica más profunda de lo que normalmente es posible.
Objetivo del estudio:
- Para analizar la composición atmosférica de la enana marrón Gliese 229B.
- Para identificar la naturaleza de las partículas observadas en las profundidades de su atmósfera.
- Para entender los procesos atmosféricos que ocurren en esta enana marrón única.
Principales métodos:
- Análisis espectral de Gliese 229B en el rango de 0,85 a 1,0 micrómetros.
- Comparación de las propiedades ópticas de partículas observadas con composiciones conocidas de nubes (hielo y silicatos).
- Modelado de procesos atmosféricos basados en datos espectrales observados y radiación estelar.
Principales resultados:
- Se detectaron partículas atmosféricas en las profundidades de Gliese 229B (10 a 50 barras).
- Estas partículas exhiben propiedades ópticas distintas tanto del hielo como de las nubes de silicato.
- Un color rojizo sugiere una composición orgánica, similar a los aerosoles estratosféricos planetarios.
- La fracción de masa de las partículas es consistente con un origen fotoquímico.
Conclusiones:
- La atmósfera de Gliese 229B alberga aerosoles orgánicos, no nubes de hielo o silicato.
- Los procesos fotoquímicos, impulsados por la radiación estelar, son probablemente los responsables de estos aerosoles.
- Estos hallazgos sugieren que los procesos atmosféricos similares a los planetarios pueden ocurrir en enanas marrones.
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