Astronomers at Wesleyan have detected shock waves produced by a high-speed “hot Jupiter” exoplanet caught in a tight orbit around its host star, io9 reported. The story explains:
It’s a potential indication of an incredibly powerful magnetic field around the planet.
Also known as “roaster planets,” hot Jupiters are so named because they have many characteristics in common with the largest gas giant in our solar system, most notably mass. But they have much hotter surface temperatures because they orbit much closer to their parent stars.
Researcher in Astronomy Wilson Cauley has published a new study on the topic in the Astrophysical Journal. io9 quotes Cauley’s website:
If the planet is moving supersonically through the stellar wind or coronal plasma, a bow shock will form between the planet and the star at an angle that is determined by the relative velocity of the planet and the plasma. If the planet has a magnetosphere, the bow shock will form where the pressure between the plasma and the magnetosphere balance. For planets with strong magnetic fields, the bow shock can form many planetary radii ahead of the planet in it’s orbit. If the compression of the stellar wind material in the bow shock is high enough, the line-of-sight column density of material in the bow shock between us and the star can be high enough to produce a visible absorption signature in the stellar spectrum. This absorption signature occurs before the planet normally transits the star.