  The third Gaia data release includes a catalog of exoplanets and exoplanet
candidates identified via the star's astrometric motion. This paper reports on
tests for consistency between the Gaia two-body orbital solutions and precise
Doppler velocities, for the stars currently amenable to such a comparison. For
BD 17-0063, HD 81040, and HD 132406, the Gaia orbital solution and the Doppler
data were found to be consistent, and were fitted jointly to obtain the best
possible constraints on the planets' orbits and masses. Inconsistencies were
found for 4 stars: HD 111232, probably due to additional planets that were not
included in the astrometric model; HD 175167 and HR 810, possibly due to
inaccurate treatment of non-Gaussian uncertainties in the Gaia orbital
solutions; and HIP 66074, for unknown reasons. Consistency tests were also
performed for HD 114762, which was reported in 1989 to have a brown dwarf or
exoplanet but has since been shown to be binary star. The joint Gaia-Doppler
analysis shows the secondary mass to be 0.215 +/- 0.013 Msun and the orbital
inclination to be 3.63 +/- 0.06 degrees.
