A Six-Planet System Around the Star HD 34445

Abstract

We present a new precision radial velocity 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 Jupiter masses 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 $2\mathrm{m}{\mathrm{s}}^{-1}\lesssim K\lesssim 5\mathrm{m}{\mathrm{s}}^{-1}$ 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)

10 pages, 11 figures

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Cited by in corpus (7)

• Solar System Physics for Exoplanet Research
• Speckle Imaging Characterization of Radial Velocity Exoplanet Systems
• A collage of small planets from the Lick Carnegie Exoplanet Survey : Exploring the super-Earth and sub-Neptune mass regime
• On the Scaling and Spacing of Extra-Solar Multi-Planet Systems
• The California Legacy Survey I. A Catalog of 178 Planets from Precision Radial Velocity Monitoring of 719 Nearby Stars over Three Decades
• An adaptive optics upgrade for the Automated Planet Finder Telescope using an adaptive secondary mirror
• Do the planets in the HD 34445 system really exist?