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We report 1.3 cm and 6 cm continuum observations toward the massiveproto-stellar candidate G11.11-0.12P1 using the Karl G. Jansky Very Large Array(VLA). We detect a string of four unresolved radio continuum sources coincidentwith the mid-IR source in G11P1. The continuum sources have positive spectralindices consistent with a thermal (free-free) ionized jet. The most likelyorigin of the ionized gas are shocks due to the interaction of a stellar windwith the surrounding high-density material. We also present NIR United KingdomInfrared Telescope (UKIRT) archival data which show an extended structuredetected only at K-band (2.2 $\mu$m), which is oriented perpendicular to thejet, and that may be scattered light from a circumstellar disk around themassive protostar. Our observations plus the UKIRT archival data thus providenew evidence that a disk/jet system is present in the massive protostellarcandidate located in the G11.11-0.12P1 core.

Weak and Compact Radio Emission in Early Massive Star Formation Regions: An Ionized Jet Toward G11.11-0.12P1