  We report new VLA and e-MERLIN high resolution and sensitivity images of the
Triple Radio continuum Source in the Serpens star forming region. These
observations allowed us to perform a deep multi-frequency, multi-epoch study by
exploring the innermost regions (<~100 au) of an intermediate-mass YSO for the
first time, with a physical resolution of ~15 au. The kinematic analysis of
knots recently ejected by the protostar indicates that the jet is undergoing
episodic variations in velocity. In addition, our multi-frequency images reveal
striking characteristics, e.g., a highly collimated ionized stream that would
be launched at a radial distance of ~0.4 au from the protostar, and a narrow
(~28 au wide) ionized cavity that would be excited by the interaction of a
wide-angle component with the surrounding toroid of infalling material. In
light of these results, we propose the scenario in which both a
highly-collimated jet and a wide-angle wind coexist to be the most plausible to
explain our observations, either launched by the X-wind or X- plus Disk-wind
mechanism.
