2011AJ....142...97F

We present several molecular line emission arcsecond and subarcsecond observations obtained with the Submillimeter Array in the direction of the massive protostar IRAS 18162-2048, the exciting source of HH 80-81. The data clearly indicate the presence of a compact (radius ~425-850 AU) SO₂ structure, enveloping the more compact (radius ≲ 150 AU) 1.4 mm dust emission (reported in a previous paper). The emission spatially coincides with the position of the prominent thermal radio jet which terminates at the HH 80-81 and HH 80N Herbig-Haro objects. Furthermore, the molecular emission is elongated in the direction perpendicular to the axis of the thermal radio jet, suggesting a disk-like structure. We derive a total dynamic mass (disk-like structure and protostar) of 11-15 M_☉. The SO₂ spectral line data also allow us to constrain the structure temperature between 120 and 160 K and the volume density ≳ 2x10⁹/cm3. We also find that such a rotating flattened system could be unstable due to gravitational disturbances. The data from C¹⁷O line emission show a dense core within this star-forming region. Additionally, the H₂ CO and SO emissions appear clumpy and trace the disk-like structure, a possible interaction between a molecular core and the outflows, and in part, the cavity walls excavated by the thermal radio jet.