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arXiv · 2205.10422

Resolving the collimation zone of an intermediate-mass protostar

Adriana R. Rodríguez-Kamenetzky·Carlos Carrasco-González·Luis Felipe Rodríguez Jorge·Tom P. Ray·Alberto Sanna·Luca Moscadelli·Melvin Hoare·Roberto Galván-Madrid·Hsien Shang·Susana Lizano·Jochen Eislöffel·Jeremy Lim·José M. Torrelles·Paul Ho·Anton Feeney-Johansson
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Abstract

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.

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Adriana R. Rodríguez-Kamenetzky, Carlos Carrasco-González, Luis Felipe Rodríguez Jorge, Tom P. Ray, Alberto Sanna, Luca Moscadelli, Melvin Hoare, Roberto Galván-Madrid, Hsien Shang, Susana Lizano, Jochen Eislöffel, Jeremy Lim, José M. Torrelles, Paul Ho, Anton Feeney-Johansson. 2022-05-20. Resolving the collimation zone of an intermediate-mass protostar. https://doi.org/10.3847/2041-8213%2Fac6fd1

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