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Desalineación de la órbita de giro estelar en un sistema multiplanetario

Daniel Huber¹, Joshua A Carter, Mauro Barbieri

¹NASA Ames Research Center, MS 244-30, Moffett Field, CA 94035, USA.

Science (New York, N.Y.)

|October 19, 2013

Resumen

La desalineación del espín-órbita no es exclusiva de los sistemas de Júpiter caliente. La asteroseismología reveló una gran oblicuidad para Kepler-56, un gigante rojo con dos planetas, lo que indica que las desalineaciones ocurren en configuraciones más amplias de sistemas planetarios.

Área de la Ciencia:

La ciencia exoplanetaria es la ciencia de los exoplanetas.
La astrofísica estelar es la astrofísica estelar.
Asteroseismología La Asteroseismología

Sus antecedentes:

Las estrellas con Júpiter calientes a menudo exhiben altas oblicuidades, lo que sugiere una interrupción dinámica en su formación.
Las estrellas con múltiples planetas coplanares suelen mostrar bajas oblicuidades, lo que implica la migración del disco.
Kepler-56 es una estrella gigante roja con dos planetas coplanares en tránsito conocidos.

Objetivo del estudio:

Para investigar la alineación de la órbita de giro en sistemas más allá de aquellos con Júpiter caliente.
Para determinar la oblicuidad de la gigante roja Kepler-56.
Para probar la hipótesis de que las compañeras en órbita ancha pueden inducir desalineaciones.

Principales métodos:

Se empleó asterosismología para medir con precisión la oblicuidad estelar de Kepler-56.
Análisis de los datos de tránsito de Kepler para los dos planetas conocidos.
Se realizaron mediciones de velocidad radial para buscar compañeras adicionales.

Principales resultados:

Se descubrió que Kepler-56 tiene una gran oblicuidad, lo que desafía la dicotomía entre los sistemas de Júpiter caliente y los sistemas de baja oblicuidad.
El estudio demuestra que los desajustes en la órbita de giro no se limitan a los sistemas de exoplanetas de Júpiter caliente.
Un tercer compañero de gran órbita fue detectado en el sistema Kepler-56 a través de la velocidad radial.

Conclusiones:

Las desalineaciones de espín-órbita pueden ocurrir en sistemas con múltiples planetas coplanares, no solo Júpiter calientes.
La presencia de un compañero en órbita amplia proporciona un mecanismo plausible para inducir grandes oblicuidades.
Este hallazgo amplía la comprensión de la formación del sistema planetario y las vías de evolución.

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