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We re-analyse the HARPS radial velocities of HD 10180 and calculate theprobabilities of models with differing numbers of periodic signals in the data.We test the significance of the seven signals, corresponding to sevenexoplanets orbiting the star, in the Bayesian framework and perform comparisonsof models with up to nine periodicities. We use posterior samplings andBayesian model probabilities in our analyses together with suitable priorprobability densities and prior model probabilities to extract all thesignificant signals from the data and to receive reliable uncertainties for theorbital parameters of the six, possibly seven, known exoplanets in the system.According to our results, there is evidence for up to nine planets orbiting HD10180, which would make this this star a record holder in having more planetsin its orbits than there are in the Solar system. We revise the uncertaintiesof the previously reported six planets in the system, verify the existence ofthe seventh signal, and announce the detection of two additional statisticallysignificant signals in the data. If of planetary origin, these two additionalsignals would correspond to planets with minimum masses of 5.1$^{+3.1}_{-3.2}$and 1.9$^{+1.6}_{-1.8}$ M$_{\oplus}$ on orbits with 67.55$^{+0.68}_{-0.88}$ and9.655$^{+0.022}_{-0.072}$ days periods (denoted using the 99% credibilityintervals), respectively.

Evidence for 9 planets in the HD 10180 system