Figure 8-1: Astrophysically important structures would be resolved in the thermal infrared around very young, deeply embedded protostars. The left panels compare the sub-AU structure for a protostar observed nearly edge-on through its disk in the 17 µm dust continuum for a model (upper panel) and as would be seen with TPF. The right panels show a similar comparison in the 17 µm line of H2, a transition where the jet should radiate strongly. The scale of these images is in arcseconds, so that 0.05 arcsecond tick marks correspond to ~ 7.5 AU at the distance of the Taurus molecular cloud.