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WASP-12b como un planeta prolado, inflado y perturbador por la disipación de las mareas

Shu-Lin Li¹, N Miller, Douglas N C Lin

¹Kavli Institute for Astronomy and Astrophysics, Peking University, Beijing 100871, China.

|February 26, 2010

Resumen

Exóticos exoplanetas de masa de Júpiter como WASP-12b, que orbitan muy cerca de sus estrellas, están perdiendo masa. Las fuerzas de marea distorsionan estos planetas, haciendo que se inflen y potencialmente formen un disco de gas alrededor de la estrella.

Área de la Ciencia:

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

Sus antecedentes:

Los exoplanetas de masa de Júpiter que orbitan cerca de sus estrellas (Júpiter calientes) fueron inesperados.
WASP-12b es un planeta en tránsito con una masa de 1,4 masas de Júpiter, orbitando a 3.1 radios estelares con un período de 1.1 días.
Su gran radio y su órbita no circular son sorprendentes para una proximidad tan cercana.

Objetivo del estudio:

Para analizar las propiedades del exoplaneta WASP-12b.
Comprender los procesos físicos que afectan a los exoplanetas masivos y cercanos.
Para investigar la pérdida de masa y la dinámica orbital de WASP-12b.

Principales métodos:

Análisis de los datos de observación para WASP-12b.
Modelado de las fuerzas de marea y sus efectos en la estructura planetaria.
Análisis de la curva de luz teniendo en cuenta la forma planetaria.

Principales resultados:

WASP-12b está perdiendo masa hacia su estrella anfitriona a una velocidad de 10~7 masas de Júpiter por año.
La forma del planeta está distorsionada por la intensa gravedad estelar.
La curva de luz difiere aproximadamente en un 10% de la de un planeta esférico.

Conclusiones:

La disipación de las mareas en la envoltura convectiva del planeta alimenta su gran volumen.
Un disco de gas de material planetario despojado puede rodear la estrella anfitriona.
Podría existir una súper-Tierra resonante, perturbando la órbita de WASP-12b y manteniendo su excentricidad.

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