Notes. ^(a) Asterisks * denote M dwarfs unless specified otherwise. Eruptive* denotes eruptive variable stars classified by SIMBAD. ^(b) Distance d (derived from the parallaxes) and Gaίa colour G_BP – G_RP of each stellar systems are given by the Gaia Catalogue of Nearby Stars (Gaia Collaboration 2021b), which quotes measurements from Gaίa Early Data Release 3 (Gaia Collaboration 2021a). ^(c) Stokes V flux density S_V and fraction of circularly polarised radio emission S_V/S_I are given by the V-LoTSS catalogue (Callingham et al. 2023). ^(d) X-ray luminosity X_L of each stellar system is given by the Second ROSAT all-sky survey source catalogue (2RXS; Boller et al. 2016), unless specified otherwise. The derivation of the X_L upper limit values for some stellar systems in our sample is described in detail in Callingham et al. (2021b).

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