Abstract
Astrometry or radial velocity method, as an exoplanet detection and characterisation method, needs more information to reveal the complete orbit solution of stellar companions. We combine these two methods by cross-calibrating the Hipparcos-Gaia Catalogue of Accelerating Stars and Lick data to generate more precise mass and orbital solutions of stellar companions from the overlap of these two databases. We use an open-source package, orvara, to simulate the posterior parameters of companions from candidate stars. To simplify the simulation, we assume all systems in this research contain only a 2-body Keplerian fit. A final result of 16 candidates is selected, and five companions with the lowest masses are further discussed. Among these five companions, four in system HIP42112, HIP49699, HIP74948 and HIP98819 were discovered and recorded in previous work. This paper has found an undiscovered potential brown dwarf companion near HIP98978. The result of this paper could help future studies of low-mass companions of exoplanets.
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