Mass-radius diagrams showing the locations of HIP 29442 b (left panel) and HIP 29442 c and d (right panel) in relation to the known exoplanet population. The transparent pink points show the planetary parameters derived by Damasso et al. (2023). Mass-radius relations for fixed compositions and equilibrium temperatures were generated using BICEPS (Haldemann et al. 2024). Shown are three different compositions for bare cores (solid lines in different shades of green), Earth-like cores with different amounts of water (dashed lines in different shades of blue) and Earth-like cores with different amounts of H/He (dotted lines in different shades of red). The models in the left panel were calculated assuming an equilibrium temperature of 700 K (similar to HIP 29442 b), while the models in the right panel were calculated assuming an equilibrium temperature of 1000 K (similar to HIP 29442 c and d).