The existence of a planet around Alpha Centauri B was announced in October 2012. Now a paper from 21 May 2013 (http://arxiv.org/abs/1305.4960) says that the original announcement was premature. By using two different data analysis techniques they found that one detected a planet and the other did not. Looking further, they found that the random noise distribution has a peak at the same frequency as the supposed planet orbit. Stay tuned for future revelations.