Characterizing the Rotation of Exoplanet Host Stars

Stellar rotation plays an important role in the evolution of planetary systems. The first half of this chapter gives an overview of stellar rotation and its evolution over time, before discussing how that evolution can be influenced by the presence of planets and the implications thereof for estimating stellar ages using rotation. The second half of the chapter describes a range of different methods for studying rotation in planet-hosting stars, along with some of the results obtained using those methods, before concluding with a brief look toward the future.