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Radiación infrarroja de un planeta extrasolar
Drake Deming1, Sara Seager, L Jeremy Richardson
1Planetary Systems Laboratory and Goddard Center for Astrobiology, Code 693, NASA's Goddard Space Flight Center, Greenbelt, Maryland 20771, USA. Leo.D.Deming@nasa.gov
Nature
|March 24, 2005
Resumen
Los astrónomos detectaron radiación infrarroja del Júpiter caliente HD 209458b, confirmando que está calentado por su estrella. Este hallazgo sugiere que el planeta probablemente tiene una órbita circular, lo que desafía las teorías anteriores sobre su gran tamaño.
Área de la Ciencia:
- La astronomía y la astrofísica.
- Ciencia exoplanetaria Ciencia de los exoplanetas.
Sus antecedentes:
- Los Júpiter calientes son exoplanetas gigantes gaseosos que orbitan muy cerca de sus estrellas.
- Se espera que estos planetas sean calientes y emitan radiación infrarroja.
- HD 209458b es un exoplaneta con un radio inusualmente grande, posiblemente debido a la disipación de las mareas que requiere excentricidad orbital.
Objetivo del estudio:
- Para detectar y caracterizar la radiación infrarroja del exoplaneta HD 209458b.
- Para investigar la emisión térmica de HD 209458b y sus implicaciones para la dinámica orbital.
Principales métodos:
- Observando la disminución en el flujo infrarrojo (24 micrómetros) durante el eclipse secundario de HD 209458b.
- Analizando el momento del eclipse secundario en relación con los tránsitos planetarios.
Principales resultados:
- Detección directa de la radiación infrarroja de 24 micrómetros emitida por HD 209458b (55 +/- 10 microJy). detección directa de la radiación infrarroja de 24 micrómetros emitida por HD 209458b (55 +/- 10 microJy). detección directa de la radiación infrarroja de 24 micrómetros emitida por HD 209458b (55 +/- 10 microJy).
- Temperatura de brillo medida de 1,130 +/- 150 K, consistente con la irradiación estelar.
- El momento del eclipse secundario indica una órbita casi circular, lo que contradice las teorías que requieren una excentricidad orbital significativa.
Conclusiones:
- La emisión infrarroja detectada confirma el calentamiento estelar significativo de HD 209458b.
- El momento preciso del eclipse secundario sugiere que HD 209458b tiene una excentricidad orbital dinámicamente insignificante.
- Esto desafía las explicaciones para el gran radio del planeta que se basan en la disipación de las mareas impulsada por la excentricidad orbital.
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