Stars and neighboring planets can fling giant worlds toward their suns.
The new study, though, favors the third idea: Gravitational interactions with another giant planet or a companion star first hurl a Jupiter-sized planet onto a highly elliptical and inclined orbit that brings it close to its star. In some cases, the planet even revolves the wrong way around its star, opposite the way it spins.
Stars usually circularize a planet’s orbit before they realign it, and cool stars realign an orbit faster than warm stars do. So Rice and her colleagues looked for relationships between the shapes and tilts of the orbits of several dozen hot Jupiters that go around stars of different temperatures.
Nous avons résumé cette actualité afin que vous puissiez la lire rapidement. Si l'actualité vous intéresse, vous pouvez lire le texte intégral ici. Lire la suite: