标题： V1094 Sco周围原恒星尘埃盘的强毫米辐射探测：处于静止吸积阶段的T星云星周围的冷而大质量的盘？ 显示英文标题

标题： 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?

摘要： 我们从ASTE上的AzTEC在1.1毫米连续谱观测中发现了围绕卢pus分子云中的T Tauri星V1094 Sco的冷致密尘埃盘。一个紧凑的（$r\lesssim$320 AU）连续辐射与恒星位置一致，通量密度为272 mJy，这是Lupus中T Tauri星中最大的。我们还报告了在五点观测中与该恒星相关的分子气体的检测，在$^{12}$CO J=3--2和$^{13}$CO J=3--2中。由于我们的$^{12}$CO和$^{13}$CO观测没有显示出大尺度喷流或大质量包层的迹象，因此紧凑的尘埃辐射很可能来自恒星周围的盘。观测到的V1094 Sco的SED在近红外到毫米波段没有明显的拐点，这可以用一个扁平的盘来很好地描述尘埃成分，并且在10$\micron$附近没有明显的凹陷特征，暗示盘中没有内空洞。我们将一个简单的幂律盘模型拟合到观测到的SED上。 估计的盘质量从0.03到 $\gtrsim$0.12 $M_\sun$，这比金牛座中T Tauri星的中位盘质量大一到两个数量级。 显示英文摘要

摘要： 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.