Abstract 

  Binary stars are common and account for one third of stellar systems in the solar neighborhood. Planet formation in binary stars is thought to be difficult because of dynamical perturbation from a companion star. I will provide observational evidence to support the suppressed planet formation in tight binary stars. Moreover, observations suggest that planet formation in binary stars is more complicated than theory predicts: planet occurrence rate depends on not only binary star separation but also planet radius. Small rocky planets are more difficult to form than large gaseous planets in binary stars. This finding has significant implications to future missions in the search of Earth-analogs. I discuss how current and future missions (K2 and TESS) can confirm and further our understanding of planet formation in binary stars.