We re-analyze the precision radial velocity ( RV ) observations of HD160691 ( \mu Ara ) by the Anglo-Australian Planet Search Team .
The star is supposed to host two Jovian companions ( HD160691b , HD160691c ) in long-period orbits ( \sim 630 days and \sim 2500 days , respectively ) and a hot-Neptune ( HD160691d ) in \sim 9 days orbit .
We perform a global search for the best fits in the orbital parameters space with a hybrid code employing the genetic algorithm and simplex method .
The stability of Keplerian fits is verified with the N -body model of the RV signal that takes into account the dynamical constraints ( so called GAMP method ) .
Our analysis reveals a signature of the fourth , yet unconfirmed , Jupiter-like planet HD160691e in \sim 307 days orbit .
Overall , the global architecture of four-planet configuration recalls the Solar system .
All companions of \mu Ara move in quasi-circular orbits .
The orbits of two inner Jovian planets are close to the 2:1 mean motion resonance .
The alternative three-planet system involves two Jovian planets in eccentric orbits ( e \sim 0.3 ) , close to the 4:1 MMR , but it yields a significantly worse fit to the data .
We also verify a hypothesis of the 1:1 MMR in the subsystem of two inner Jovian planets in the four-planet model .