Submillimeter imaging of T Tauri's circumbinary disk and the discovery of a protostar in Hind's Nebula

We have obtained images at 2.2, 450, and 850 mu m of the pre-main-sequence binary T Tauri and of Hind's Nebula, which is located less than 1' west of T Tauri. The three maps reveal that the nebulosity around T Tauri is extend ed, with an FWHM size of several hundred AU in thermal emission and more th an 1000 AU in reflected light. Dust clearly connects the circumstellar nebu la around T Tauri to the southwestern tip of Hind's Nebula, where we have i dentified a secondary intensity peak in the submillimeter maps. Calculation s of the long-wavelength emissivity demonstrate that the dust emissivity in dex beta is similar to 2 for the large nebula but is similar to 1.2 for the secondary intensity peak. These results for beta suggest that we have foun d a class I protostar 30" southwest of T Tauri and that star formation is m ore active in the vicinity of T Tauri than previously had been thought. Thi s protostar is detected directly at submillimeter wavelengths; however, pol arization mapping at 2.2 mu m demonstrates that the disk-shaped dust cloud around the protostar is illuminated externally at short wavelengths, making it similar to the Orion proplyds.