2003ApJ...591..275S

New subarcsecond far-UV observations of T Tau with Hubble Space Telescope STIS show spatially resolved structures in the 2''x2'' area around the star. The structures are apparent in multiline emission of fluorescent H₂pumped by Lyα. One emission structure follows the cavity walls observed around T Tau N in scattered light in the optical. A temperature of ≥1000 K is required to have a high enough population in the H₂to produce the observed fluorescent lines; in the cool environment of the T Tau system, shock heating is required to achieve this temperature at distances of a few tens of AU. Fluorescent H₂along the cavity wall represents the best evidence to date for the action of low-density, wide opening angle outflows driving cavities into the molecular medium at scales ≤100 AU. A southern region of emission consists of two arcs, with shape and orientation similar to the arcs of H₂2.12 µm and forbidden-line emission crossing the outflow associated with the embedded system T Tau S. This region is located near the centroid of forbidden-line emission at the blueshifted lobe of the north-south outflow.