Research: Star-planet interactions
Close-in planets oftern interact with their host stars tidally and magnetically. These planets are often tidally locked with their stars. Some of these planets are even expected to be distorted in shape. Their surface temperature is so high that their atmopsheres are ballooned and some of its materials are escaped from the planet. The magnetospheres of the star and the planet may also interact, triggering different magnetic events, such as reconnection of magnetic field lines and flux tube between the planet and the star. These events generate a huge amount of energy, causing intriguing observable events on the atmospheres of the star and the planet. Observations reporting chromospheric hot spots on the star phased to the orbital period of the planet and excess in magnetic activities of starshosting hot Jupiters provide evidence of star-planet magnetic interactions.