Astronomers using the W.M. Keck Observatory on Maunakea, Hawaii, have completed the largest survey of exoplanet rotation rates, studying dozens of gas giants and brown dwarfs in distant star systems. The research confirms a long-theorized connection between planetary mass and rotational speed.
The survey focused on gas giant exoplanets and brown dwarfs—objects that fall between planets and stars in mass. By measuring rotation rates across this sample, researchers were able to test theoretical models that predict how an object's mass influences its spin characteristics.