The Rossiter-McLaughlin effect is an observational phenomenon that occurs during a planetary transit, where the motion of a star's surface affects the observed radial velocity of the star due to the presence of an orbiting body. This effect is particularly important in high-resolution spectroscopy as it provides insights into the alignment of a planet's orbit relative to its host star's rotation. Understanding this effect helps astronomers to determine the true nature of exoplanetary systems.
congrats on reading the definition of Rossiter-McLaughlin effect. now let's actually learn it.