2025ApJ...989...56H

Interstellar complex organic molecules (COMs) in solar-like young stellar objects (YSOs), particularly within protostellar disks, are of significant interest owing to their potential connection to prebiotic chemistry in emerging planetary systems. We report the discovery of a rotating feature enriched in COMs, including CH₃OH, CH₃CHO, and NH₂CHO, in the protostellar core G192.12-11.10. By constructing a YSO model, we find that the COM-rich feature is likely located within or near the boundary of the Keplerian disk. The image synthesis results suggest that additional heating mechanisms leading to a warm ring or a warm inner disk are required to reproduce the observed emission. We discuss possible origins of the COM-rich feature, particularly accretion shocks as a plausible cause for a warm ring. Additionally, molecules such as C¹⁸O, H₂CO, DCS, H₂S, and OCS exhibit distinct behavior compared to CH₃OH, indicating a range of physical and chemical conditions within the region. The observed kinematics of H₂S and OCS suggest that OCS resides in regions closer to the central protostar than H₂S, consistent with previous experimental studies.