We present a new precision radial velocity ( RV ) dataset that reveals a multi-planet system orbiting the G0V star HD 34445 .
Our 18-year span consists of 333 precision radial velocity observations , 56 of which were previously published , and 277 which are new data from Keck Observatory , Magellan at Las Campanas Observatory , and the Automated Planet Finder at Lick Observatory .
These data indicate the presence of six planet candidates in Keplerian motion about the host star with periods of 1057 , 215 , 118 , 49 , 677 , and 5700 days , and minimum masses of 0.63 , 0.17 , 0.1 , 0.05 , 0.12 and 0.38 M _ { J } respectively .
The HD 34445 planetary system , with its high degree of multiplicity , its long orbital periods , and its induced stellar radial velocity half-amplitudes in the range 2 { m s ^ { -1 } } \lesssim K \lesssim 5 { m s ^ { -1 } } is fundamentally unlike either our own solar system ( in which only Jupiter and Saturn induce significant reflex velocities for the Sun ) , or the Kepler multiple-transiting systems ( which tend to have much more compact orbital configurations ) .