Prevalence of Earth-size planets orbiting Sun-like stars
Erik Petigura



The study of extrasolar planets has matured beyond individual discoveries to the characterization of the planet population has a whole. The emerging field of exoplanet demographics parallels the work of Hertzsprung, Russell, and others a century ago. Just as the HR diagram shaped our understanding of stellar physics, the prevalence of planets with different sizes, orbital distances, and other properties is shaping our understanding of planet formation and evolution. I will highlight recent planet occurrence results stemming from the Kepler mission. Kepler has shown that planets smaller than Neptune dominate the planet population inside 1 AU, in stark contrast to models predicting a "planet desert." Planets like Earth may be common throughout the galaxy: 22% of Sun-like stars harbor an Earth-size planet that receives similar levels stellar radiation as Earth.