V819 Tau: A Rare Weak-lined T Tauri Star with A Weak Infrared Excess

December 2009 • 2009ApJ...706.1194F

Authors • Furlan, E. • Forrest, W. J. • Sargent, B. A. • Manoj, P. • Kim, K. H. • Watson, Dan M.

Abstract • We use Spitzer data to infer that the small infrared excess of V819 Tau, a weak-lined T Tauri star in Taurus, is real and not attributable to a "companion" 10'' to the south. We do not confirm the mid-infrared excess in HBC 427 and V410 X-ray 3, which are also non-accreting T Tauri stars in the same region; instead, for the former object, the excess arises from a red companion 9'' to the east. A single-temperature blackbody fit to the continuum excess of V819 Tau implies a dust temperature of 143 K; however, a better fit is achieved when the weak 10 and 20 μm silicate emission features are also included. We infer a disk of sub-μm silicate grains between about 1 AU and several 100 AU with a constant surface density distribution. The mid-infrared excess of V819 Tau can be successfully modeled with dust composed mostly of small amorphous olivine grains at a temperature of 85 K, and most of the excess emission is optically thin. The disk could still be primordial, but gas-poor and therefore short-lived, or already at the debris disk stage, which would make it one of the youngest debris disk systems known.

Links

• SIMBAD http://simbad.u-strasbg.fr/simbo.pl?bibcode=2009ApJ...706.1194F
• PDF https://iopscience.iop.org/article/10.1088/0004-637X/706/2/1194/pdf
• PREPRINT http://arxiv.org/abs/0911.0035
• DATA https://irsa.ipac.caltech.edu/bibdata/2009/F/2009ApJ...706.1194F.html
• ELECTR https://doi.org/10.1088/0004-637X/706/2/1194
• SPIRES http://inspirehep.net/search?p=find+eprint+arXiv:0911.0035