Kavli Affiliate: Andrew Vanderburg
| First 5 Authors: Alexander Venner, Qier An, Chelsea X. Huang, Timothy D. Brandt, Robert A. Wittenmyer
| Summary:
As exoplanet surveys reach ever-higher sensitivities and durations, planets
analogous to the solar system giant planets are increasingly within reach. HD
28185 is a Sun-like star known to host a $msin i=6 M_J$ planet on an
Earth-like orbit; more recently, a brown dwarf with a more distant orbit has
been claimed. In this work we present a comprehensive reanalysis of the HD
28185 system, based on 22 years of radial velocity observations and precision
Hipparcos-Gaia astrometry. We confirm the previous characterisation of HD 28185
b as a temperate giant planet, with its $385.92^{+0.06}_{-0.07}$ day orbital
period giving it an Earth-like incident flux. In contrast, we substantially
revise the parameters of HD 28185 c; with a new mass of $m=6.0pm0.6 M_J$ we
reclassify this companion as a super-jovian planet. HD 28185 c has an orbital
period of $24.9^{+1.3}_{-1.1}$ years, a semi-major axis of
$8.50^{+0.29}_{-0.26}$ AU, and a modest eccentricity of $0.15pm0.04$,
resulting in one of the most Saturn-like orbits of any known exoplanet. HD
28185 c lies at the current intersection of detection limits for RVs and direct
imaging, and highlights how the discovery of giant planets at $approx$10 AU
separations is becoming increasingly routine.
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