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Rápido calentamiento de la atmósfera de un planeta extrasolar
Gregory Laughlin1, Drake Deming, Jonathan Langton
1UCO/Lick Observatory, University of California, Santa Cruz, California 95064, USA. laughlin@ucolick.org
Nature
|January 30, 2009
Resumen
Los astrónomos observaron el exoplaneta HD 80606b de Júpiter caliente durante su mayor acercamiento a su estrella. El planeta El planeta El planeta.
Área de la Ciencia:
- Ciencia exoplanetaria Ciencia de los exoplanetas.
- Astronomía por infrarrojos Astronomía por infrarrojos
- Las atmósferas planetarias.
Sus antecedentes:
- Los exoplanetas de Júpiter caliente están sincronizados por mareas, poseen hemisferios permanentes orientados hacia las estrellas.
- Los planetas con órbitas excéntricas permiten la medición directa del calentamiento global.
- HD 80606b tiene una órbita extremadamente excéntrica, por lo que es ideal para estudiar los efectos de calentamiento de las mareas.
Objetivo del estudio:
- Para medir la emisión térmica de HD 80606b durante el paso periastron.
- Para restringir las propiedades atmosféricas del planeta y la tasa de calentamiento de las mareas.
- Para investigar la dinámica de las atmósferas exoplanetarias bajo irradiación extrema.
Principales métodos:
- Observaciones fotométricas de 8 micras durante un intervalo de 30 horas alrededor de periastron.
- Análisis de las variaciones de temperatura de brillo.
- Detección del eclipse secundario para determinar la inclinación orbital y la masa planetaria.
Principales resultados:
- Se observó un rápido aumento en la temperatura de brillo de ~800 K a ~1500 K durante seis horas.
- Se detectó un eclipse secundario, lo que implica una inclinación orbital cercana a los 90 grados.
- Se midió una constante de tiempo radiativo de ~4,5 horas en la fotosfera de 8 micrones.
Conclusiones:
- HD 80606b experimenta un calentamiento global significativo debido a su órbita excéntrica.
- La constante de tiempo radiativo del planeta es mucho más corta que el valor estratosférico de la Tierra.
- Estos hallazgos proporcionan información sobre la dinámica atmosférica de los exoplanetas altamente irradiados.
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