Orbital properties of T Tauri visual binaries. In both panels, black diamonds and green crosses represent ≲3 Myr-old systems with and without circumstellar material, respectively, while yellow crosses are ~ 10–20 Myr-old disk-free systems in Upper Scorpius and the TW Hya association. The two red stars mark the systems studied here. Left: comparison of orbital period and eccentricity based on literature results listed in Appendix B. Right: comparison of periastron distances and dynamical masses for the same systems.