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Un sistema muy compacto de planetas de baja masa y baja densidad que transitan por Kepler-11
Jack J Lissauer1, Daniel C Fabrycky, Eric B Ford
1NASA Ames Research Center, Moffett Field, California 94035, USA. jack.lissauer@nasa.gov
Nature
|February 5, 2011
Resumen
Los astrónomos descubrieron seis planetas en tránsito orbitando la estrella Kepler-11, revelando un sistema compacto con cinco planetas interiores. Estos planetas tienen masas y tamaños medibles, lo que indica envolturas de gas ligero y una configuración orbital altamente coplanar.
Área de la Ciencia:
- La astronomía es la astronomía.
- Ciencia exoplanetaria Ciencia de los exoplanetas.
- La astrofísica estelar es la astrofísica estelar.
Sus antecedentes:
- Los planetas extrasolares se detectan a través de la fotometría de tránsito, midiendo el radio del oscurecimiento de la luz de las estrellas y el período orbital del tiempo de tránsito.
- Múltiples planetas en tránsito proporcionan información sobre la dinámica del sistema, las masas de los planetas, las formas orbitales y la planaridad general del sistema.
- Anteriormente, se sabía que ninguna estrella albergaba más de tres planetas en tránsito.
Objetivo del estudio:
- Para informar sobre el descubrimiento y la caracterización de un sistema de múltiples planetas alrededor de la estrella similar al Sol Kepler-11.
- Para investigar las propiedades y configuraciones orbitales de los exoplanetas en tránsito.
- Explorar las implicaciones para las teorías de formación de planetas basadas en la arquitectura de sistemas.
Principales métodos:
- Utilizó datos de la nave espacial Kepler para las observaciones de tránsito de la estrella Kepler-11.
- Analizó las curvas de luz para detectar y confirmar múltiples planetas en tránsito.
- Los radios medidos de los planetas desde la disminución de la luz de las estrellas y los períodos orbitales desde el tiempo de tránsito.
Principales resultados:
- Descubrió un sistema de seis planetas en tránsito alrededor de Kepler-11.
- Cinco planetas interiores tienen períodos orbitales que van de 10 a 47 días; un sexto planeta tiene un período más largo.
- Los cinco planetas interiores se encuentran entre los más pequeños con masa y tamaño medidos, lo que sugiere importantes envolturas de gas ligero.
Conclusiones:
- La coplanaridad y la proximidad de las órbitas de los planetas interiores sugieren una disipación de energía significativa durante la formación de planetas en etapa tardía.
- El sistema Kepler-11 proporciona un laboratorio único para estudiar la formación y evolución de sistemas planetarios compactos.
- Este descubrimiento desafía los modelos existentes de la arquitectura del sistema planetario y los procesos de formación.
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