X-Ray Inducing Hot Jupiters

Exoplanetary Scratchpad [SysBP Img]

Hot Jupiters that interact magnetically with their stars and cause them to emit X-Rays. Sometimes this is in the form of an X-Class stellar flare. HD 179949b is the first known case.

Example Systems

• HD 179949 System - Contains the first planet discovered by the Anglo-Australian Planet Search, which is also the first exoplanet whose Magnetic Field was observed. This Hot Jupiter is about the same mass as Jupiter and orbits once every thre days. It was found to have supersonic winds that caused the night side (not tidally locked) to be as hot as the day side. This system is also the first observed to have planet-induced stellar X-ray activity. Magnetic interaction causes a bright spot on its star at 30 degrees latitude.
• OGLE-TR-10 System - Contains a bloated Hot Jupiter expected to be losing its atmosphere. Noted for its similarity to the first transiting exoplanet. Thought to not be so bloated, but then confirmed to really be bloated. Found to have the lowest measured surface gravity of any of the transiting exoplanets, considerably less than Earth. 5th confirmed OGLE planet. The first star observed to experience a stellar flare during the transit of one of its planets. The star is suggested to be active and have a high x-ray luminosity.

See Also

• Hot Jupiter