We report the Submillimeter Array ( SMA ) observations of the polarized 0.88 mm thermal dust emission and various molecular line transitions toward the early B-type ( L _ { * } \sim 2 \times 10 ^ { 3 } L _ { \odot } ) star-forming region G192.16 - 3.84 ( IRAS 05553+1631 ) .
The peak of the continuum Stokes-I emission coincides with a hot rotating disk/envelope ( SO _ { 2 } rotational temperature T _ { rot } ^ { SO _ { 2 } } \sim 84 ^ { +18 } _ { -13 } K ) , with a north-south velocity gradient .
Joint analysis of the rotation curve traced by HCO ^ { + } 4-3 and SO _ { 2 } 19 _ { 1 , 19 } -18 _ { 0 , 18 } suggests that the dense molecular gas is undergoing a spinning-up rotation , marginally bound by the gravitational force of an enclosed mass M _ { * + gas + dust } \sim 11.2-25.2 M _ { \odot } .
Perpendicular to the rotational plane a \gtrsim 100/ \cos ( i ) km s ^ { -1 } ( i \sim 63 ^ { \circ } ) high velocity molecular jet , and the \sim 15-20 km s ^ { -1 } expanding biconical cavity were revealed in the CO 3-2 emission .
The polarization percentage of the 0.88 mm continuum emission decreases toward the central rotating disk/envelope .
The polarization angle in the inner \sim 2 ^ { \prime \prime } ( 0.015 pc ) disk/envelope is perpendicular to the plane of the rotation .
The magnetic field lines , which are predominantly in the toroidal direction along the disk plane , are likely to be dragged by the gravitationally accelerated rotation .