2023RNAAS...7...65W

In spite of them being the main progenitors of white dwarfs, the multiplicity of intermediate mass stars is relatively less explored when compared to solar-type and O-type stars. Here we report the discovery of a new companion to the nearby 2.43M_⊙ A1V star HIP 42313 = δ Hya with a K band flux ratio of 1.3% based on a VLTI/GRAVITY interferometric observation. This new 0.58M_⊙ companion at a projected separation 16.7 mas ↔ 0.90 au explains both the Hipparcos-GaiaDR2 as well as the GaiaDR2-GaiaDR3 proper motion changes of δ Hya. Together with the previously known 0.44M_⊙ companion at ρ = 2.″7 ↔ 147 au, this makes δ Hya a hierarchical triple system.