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Una clase de cálidos Júpiter con amigos cercanos inclinados mutuamente y apsidalmente desalineados

Rebekah I Dawson¹, Eugene Chiang²

¹Department of Astronomy, University of California, Berkeley, Hearst Field Annex 3411, Berkeley, CA 94720-3411, USA. rdawson@berkeley.edu.

Science (New York, N.Y.)

|October 11, 2014

Resumen

Las órbitas de los planetas gigantes con compañeros excéntricos muestran inclinaciones mutuas que oscilan entre 35° y 65°. Esto proporciona evidencia de que las oscilaciones de Kozai-Lidov esculpen sistemas multiplanetarios no planos.

Área de la Ciencia:

La astronomía y la astrofísica.
Ciencia exoplanetaria Ciencia de los exoplanetas.
La dinámica planetaria es una dinámica planetaria.

Sus antecedentes:

Los planetas extrasolares gigantes exhiben órbitas inusuales, incluidos pequeños semiejes mayores, altas excentricidades y ejes de órbita de giro desalineados.
El mecanismo de oscilación de Kozai-Lidov, impulsado por un compañero externo, es una explicación propuesta para estas anomalías orbitales.
La confirmación observacional de las grandes inclinaciones mutuas predichas por las oscilaciones de Kozai-Lidov sigue siendo limitada.

Objetivo del estudio:

Investigar y proporcionar evidencia observacional de las grandes inclinaciones mutuas en sistemas multiplanetarios.
Para probar el papel de las oscilaciones de Kozai-Lidov en la configuración de las órbitas de los exoplanetas gigantes.
Comprender las vías de formación de los excéntricos y cálidos Júpiter.

Principales métodos:

Análisis de las separaciones absidales observadas para sistemas de excéntricos Júpiter cálidos y sus compañeras gigantes.
Inferir inclinaciones mutuas basadas en el agrupamiento de separaciones apsidales cerca de 90 grados.
Modelado de la influencia gravitatoria de las compañeras externas utilizando potenciales cuadrupolares y octupolares.

Principales resultados:

La evidencia sugiere que las inclinaciones mutuas de estos sistemas oscilan entre 35° y 65°.
Las separaciones apsidales observadas se agrupan cerca de 90°, lo que indica una ortogonalidad cercana de las direcciones del periapso.
Los potenciales gravitacionales de los compañeros exteriores son responsables de esta casi ortogonalidad.

Conclusiones:

Los hallazgos apoyan la hipótesis de que las oscilaciones de Kozai-Lidov esculpen sistemas multiplanetarios, lo que lleva a configuraciones no planas.
Estos sistemas pueden representar una fase estancada de la migración de las mareas, formando Júpiter cálidos desde órbitas inicialmente más cercanas.
El estudio proporciona evidencia de una población de sistemas multiplanetarios formados por interacciones dinámicas más allá de la simple formación coplanar.

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