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While most protostellar jets present free-free emission at radio wavelengths,synchrotron emission has been also proposed to be present in a handful of theseobjects. The presence of non-thermal emission has been inferred by negativespectral indices at centimeter wavelengths. In one case (the HH 80-81 jetarising from a massive protostar), its synchrotron nature was confirmed by thedetection of linearly polarized radio emission. One of the main consequences ofthese results is that synchrotron emission implies the presence of relativisticparticles among the non-relativistic material of these jets. Therefore, anacceleration mechanism should be taking place. The most probable scenario isthat particles are accelerated when the jets strongly impact against the denseenvelope surrounding the protostar. Here, we present an analysis of radioobservations obtained with the Very Large Array of the Triple Radio Source inthe Serpens star-forming region. This object is known to be a radio jet arisingfrom an intermediate-mass protostar. It is also one of the first protostellarjets where the presence of non-thermal emission was proposed. We analysed thedynamics of the jet as well as the nature of the emission and discuss theseissues in the context of the physical parameters of the jet and the particleacceleration phenomenon.

Investigating Particle Acceleration in Protostellar Jets: The Triple Radio Continuum Source in Serpens