Resolving the Collimation Zone of an Intermediate-mass Protostellar Jet

Author:

Rodríguez-Kamenetzky Adriana R.ORCID,Carrasco-González CarlosORCID,Rodríguez Luis F.ORCID,Ray Tom P.ORCID,Sanna AlbertoORCID,Moscadelli LucaORCID,Hoare MelvinORCID,Galván-Madrid RobertoORCID,Shang HsienORCID,Lizano SusanaORCID,Eislöffel JochenORCID,Lim JeremyORCID,Torrelles José M.,Ho PaulORCID,Feeney-Johansson AntonORCID

Abstract

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.

Funder

UNAM ∣ Dirección General de Asuntos del Personal Académico, Universidad Nacional Autónoma de México

EC ∣ ERC ∣ HORIZON EUROPE European Research Council

Ministry of Science and Technology, Taiwan

Publisher

American Astronomical Society

Subject

Space and Planetary Science,Astronomy and Astrophysics

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