Orbital separation and mass of the companion that would produce the observed Gaia astrometry of HD 142527(0.33<|Δμ|< 0.52 mas yr⁻¹,|Δμ|/σ_|Δμ|>4, and RUWE_DR3<1.25, from Sect. 3 Eqs. (3)–(5)). The top panel shows the individual Gaia simulations for this system. The middle panel presents the same simulations but smoothed with a kernel density estimate (contours indicate the 20, 50, and 80% levels of the normalised area). Black circles mark the location and the proposed masses for the known companion in this system (see Sect. 3.3). The bottom panel is the same as the middle panel but assuming the companion responsible for the astrometric signal is in the plane of the disc. Similar plots for all other 30 systems with significant astrometric accelerations are shown in Fig. A.2.