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Kepler-9: un sistema de múltiples planetas que transitan una estrella similar al Sol, confirmado por las variaciones
Matthew J Holman1, Daniel C Fabrycky, Darin Ragozzine
1Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA. mholman@cfa.harvard.edu
Science (New York, N.Y.)
|August 28, 2010
Resumen
Los datos de Kepler revelaron dos exoplanetas del tamaño de Saturno en una resonancia orbital de 2:1, lo que indica interacciones gravitacionales. También se detectó una tercera candidata a súper-Tierra orbitando la misma estrella.
Área de la Ciencia:
- Ciencia exoplanetaria Ciencia de los exoplanetas.
- La astrofísica es la astrofísica.
- La Dinámica Orbital es una Dinámica Orbital.
Sus antecedentes:
- La nave espacial Kepler monitorea continuamente más de 150.000 estrellas en busca de exoplanetas en tránsito.
- La detección de múltiples planetas en un solo sistema proporciona información crucial sobre la formación y la dinámica de los planetas.
Objetivo del estudio:
- Para informar sobre la detección y caracterización de dos exoplanetas del tamaño de Saturno.
- Para investigar la dinámica orbital y las interacciones gravitacionales dentro de un sistema de múltiples planetas.
- Para buscar planetas adicionales más pequeños en el sistema.
Principales métodos:
- Análisis de 7 meses de datos de fotometría de tránsito del telescopio espacial Kepler.
- Mediciones de velocidad radial para estimar las masas de los planetas.
- Modelado orbital para interpretar las variaciones observadas en el tiempo de tránsito.
Principales resultados:
- Detección de dos planetas del tamaño de Saturno que transitan una estrella similar al Sol con períodos de 19,2 y 38,9 días.
- Las variaciones de tiempo de tránsito observadas sugieren una resonancia orbital cercana a 2:1 y una interacción gravitacional significativa.
- Los datos de velocidad radial confirmaron que estos son los planetas cercanos más masivos, mejorando las estimaciones de masa.
- Se identificó un candidato a planeta del tamaño de una súper Tierra con un período de 1.6 días después de tener en cuenta los dos planetas gigantes.
Conclusiones:
- Los exoplanetas detectados exhiben fuertes interacciones gravitacionales indicativas de una resonancia orbital 2:1.
- El sistema probablemente alberga al menos tres planetas, incluidos dos planetas gigantes y una súper-Tierra cercana.
- Este descubrimiento pone de relieve la capacidad de Kepler para descubrir sistemas complejos de múltiples planetas y dinámicas de resonancia.
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