Detection of Strong Millimeter Emission from the Circumstellar Dust Disk Around V1094 Sco: Cold and Massive Disk around a T Tauri Star in a Quiescent Accretion Phase?

Abstract

We present the discovery of a cold massive dust disk around the T Tauri star V1094 Sco in the Lupus molecular cloud from the 1.1 millimeter continuum observations with AzTEC on ASTE. A compact ($r\lesssim$320 AU) continuum emission coincides with the stellar position having a flux density of 272 mJy which is largest among T Tauri stars in Lupus. We also present the detection of molecular gas associated with the star in the five-point observations in ${}^{12}$CO J=3--2 and ${}^{13}$CO J=3--2. Since our ${}^{12}$CO and ${}^{13}$CO observations did not show any signature of a large-scale outflow or a massive envelope, the compact dust emission is likely to come from a disk around the star. The observed SED of V1094 Sco shows no distinct turnover from near infrared to millimeter wavelengths, which can be well described by a flattened disk for the dust component, and no clear dip feature around 10 $\micron$ suggestive of absence of an inner hole in the disk. We fit a simple power-law disk model to the observed SED. The estimated disk mass ranges from 0.03 to $\gtrsim$0.12 $M_\sun$, which is one or two orders of magnitude larger than the median disk mass of T Tauri stars in Taurus.

18 pages, 4 figures, accepted for publication in ApJ

References in corpus (5)

• A Submillimeter View of Circumstellar Dust Disks in $\rho$ Ophiuchus
• AzTEC Millimetre Survey of the COSMOS Field: I. Data Reduction and Source Catalogue
• A Spatially Resolved Inner Hole in the Disk around GM Aurigae
• The AzTEC mm-Wavelength Camera
• Pre-main sequence spectroscopic binaries suitable for VLTI observations

Cited by in corpus (6)

• The SEEDS High Contrast Imaging Survey of Exoplanets around Young Stellar Objects
• V1094 Sco: a rare giant multi-ringed disk around a T Tauri star
• The Rotating Outflow, Envelope and Disk in Class-0/I protostar [BHB2007] 11 in the Pipe Nebula
• High-Resolution Submillimeter and Near-Infrared Studies of the Transition Disk around Sz 91
• Outflows, envelopes, and disks as evolutionary indicators in Lupus YSOs
• ALMA observations of the early stages of substellar formation in the Lupus 1 and 3 molecular clouds