Submillimeter Imaging of T Tauri's Circumbinary Disk and the Discovery of a Protostar in Hind's Nebula

Details Submillimeter Imaging of T Tauri's Circumbinary Disk and the Discovery of a Protostar in Hind's Nebula Submillimeter Imaging of T Tauri's Circumbinary Disk and the Discovery of a Protostar in Hind's Nebula

Jun 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...517..819w&link_type=abstract

The Astrophysical Journal, Volume 517, Issue 2, pp. 819-828.

Astronomy and Astrophysics

Astronomy

9

Infrared: Stars, Ism: Individual (Ngc 1555), Polarization, Ism: Reflection Nebulae, Stars: Individual (T Tauri), Stars: Pre-Main-Sequence

Scientific paper

We have obtained images at 2.2, 450, and 850 μm 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 extended, with an FWHM size of several hundred AU in thermal emission and more than 1000 AU in reflected light. Dust clearly connects the circumstellar nebula around T Tauri to the southwestern tip of Hind's Nebula, where we have identified a secondary intensity peak in the submillimeter maps. Calculations of the long-wavelength emissivity demonstrate that the dust emissivity index beta is ~2 for the large nebula but is ~1.2 for the secondary intensity peak. These results for beta suggest that we have found a class I protostar 30" southwest of T Tauri and that star formation is more active in the vicinity of T Tauri than previously had been thought. This protostar is detected directly at submillimeter wavelengths; however, polarization mapping at 2.2 μm demonstrates that the disk-shaped dust cloud around the protostar is illuminated externally at short wavelengths, making it similar to the Orion proplyds.

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