So far there is no Jupiter size planet detected orbiting Alpha Centauri A and B. However, it does not means that no planet orbiting this star system. Still there is many earth size planets would be likely. That make the Alpha Centauri System to be more possible to have habitable planets could be orbiting around either star. Since it is double star system the planets may double each other as well. This make possible to have a more than one habitable planet orbiting around the both stars, but may have up to four habitable planets orbiting the star system.