086020

Ongoing studies of magnetic activity at the end of the stellar main-sequence have revealed an emerging dichotomy in the X-ray and radio properties. The hetero- geneous properties of ultracool dwarfs openParspectral type M7 and laterclosePar display either strong coronal-like X-rays with low radio luminosities or predominantly planet-like strong radio emissions with weak X-ray luminosities. This bifurcation is likely driven by the properties of the magnetic field and the stellar rotation. We will explicitly test this hypothesis by filling the parameter space with a TESS-selected sampledoublePoint The new TESS rotation period will be complemented here with both radio and X-ray data spanning the rotation period threshold across which the dichotomy appears.