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.
@article{arxiv.2205.10422,
title = {Resolving the collimation zone of an intermediate-mass protostar},
author = {Adriana R. Rodríguez-Kamenetzky and Carlos Carrasco-González and Luis Felipe Rodríguez Jorge and Tom P. Ray and Alberto Sanna and Luca Moscadelli and Melvin Hoare and Roberto Galván-Madrid and Hsien Shang and Susana Lizano and Jochen Eislöffel and Jeremy Lim and José M. Torrelles and Paul Ho and Anton Feeney-Johansson},
journal= {arXiv preprint arXiv:2205.10422},
year = {2022}
}
Comments
13 pages, 3 figures. Accepted for publication in APJL