paper

Revisiting G29.862-0.0044: a jet cavity disrupted by an outflow in a likely young stellar object wide binary system

arXiv:2508.10197 · doi:10.1051/0004-6361/202555716

Abstract

A few years ago, we investigated MYSO G29.862-0.0044 (YSO-G29), an intriguing star-forming region at a distance of 6.2 kpc. Although the typical disc-jet scenario was proposed to explain the observations, it remained far from conclusive. YSO-G29 was analysed using new observations at near-IR from Gemini-NIFS, at radio continuum (10 GHz) from Jansky Very Large Array (JVLA), and new continuum (1.3 mm) and molecular line data from the Atacama Large Millimeter Array (ALMA). The near-IR observations allowed us to detect emission of H2 1-0 S(1) and Br-gamma lines in YSO-G29, which are compatible with excitation and ionization from UV radiation propagating in a highly perturbed ambient. In addition, some evidence of H2 excitation by collisions were found. The ALMA data show the presence of a conspicuous and collimated molecular outflow propagating southwards, while to the north, an extended molecular feature perfectly surrounded by the Ks near-IR emission appears. The continuum emission at 1.3 mm allowed us to better resolve the molecular cores, one of which stands out due to its high temperatures and rich chemical composition. From the JVLA observations, we discovered a compact radio continuum source, a likely compact Hii region or an ionised jet of a massive protostar, located at ~0.7 arcsec (~ 0.02 pc) from the main millimetre core. In this way, we propose a YSO wide binary system. {We can explain the nature of the intriguing near-IR features previously observed: cone-like structures produced by jets/winds of one of the components of the binary system that cleared out the surroundings were disrupted by a molecular outflow probably from the other component. These results complete the picture of what is happening in YSO-G29, and reveal a phenomenon that should be considered when investigating massive star-forming regions.

Figures quality degraded. Accepted for publicacion in A&A, 13 August 2025

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