Resolving the Collimation Zone of an Intermediate-mass Protostellar Jet

Journal
Date Issued
2022
Author(s)
Rodríguez-Kamenetzky, Adriana R.
•
Carrasco-González, Carlos
•
Rodríguez, Luis F.
•
Ray, Tom P.
•
•
•
Hoare, Melvin
•
Galván-Madrid, Roberto
•
Shang, Hsien
•
Lizano, Susana
•
Eislöffel, Jochen
•
Lim, Jeremy
•
Torrelles, José M.
•
Ho, Paul
•
Feeney-Johansson, Anton
DOI
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 multifrequency, multiepoch study by exploring the innermost regions (≲100 au) of an intermediate-mass young stellar object 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 multifrequency 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 as the most plausible to explain our observations, either launched by the X-wind or X-plus-disk-wind mechanism.
Volume
931
Issue
2
Start page
L26
Uri
Url
Issn Identifier
2041-8205
Ads BibCode
2022ApJ...931L..26R
Rights
open.access
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