Some astronomers believe they have found a super-Earth orbiting Barnard's star, which is only 6 light-years away. The rumor that Barnard's star had a planet goes back 60 years ago, long before the current wave of finding exo-planets even began. Interestingly enough, many years ago Larry Niven wrote a science-fiction novel that took place on a planet orbiting Barnard's star.
https://www.astronomy.com/news/2018...-barnards-star-the-second-closest-star-system
https://www.astronomy.com/news/2018...-barnards-star-the-second-closest-star-system