论文标题
用深层的观测来揭示TW HYA的外灰尘盘
Unveiling the outer dust disc of TW Hya with deep ALMA observations
论文作者
论文摘要
原星盘中毫米灰尘的径向范围通常远小于其气体，这主要是由于诸如粉尘生长和径向漂移之类的过程。但是，已经提出，由于灵敏度有限，目前的圆盘连续观测并未完全追踪其全部范围。 In this Letter, we present deep (19 $μ$Jy beam$^{-1}$) moderate resolution (0.37") ALMA observations at 1 mm of the nearest protoplanetary disc, TW Hya. Using the visibility analysis tool `frank', we reveal a structured millimetre intensity distribution out to 100 au, well beyond previous estimates of 60-70 au. Our analysis suggests the presence of a new millimetre continuum gap在82 AU中，与光学/近红外散射光线和分子线观测中的相似特征相吻合证实了先前报道的Au级连续体过量的52个AU的存在（P.A.原球盘。
The radial extent of millimetre dust in protoplanetary discs is often far smaller than that of their gas, mostly due to processes such as dust growth and radial drift. However, it has been suggested that current millimetre continuum observations of discs do not trace their full extent due to limited sensitivity. In this Letter, we present deep (19 $μ$Jy beam$^{-1}$) moderate resolution (0.37") ALMA observations at 1 mm of the nearest protoplanetary disc, TW Hya. Using the visibility analysis tool `frank', we reveal a structured millimetre intensity distribution out to 100 au, well beyond previous estimates of 60-70 au. Our analysis suggests the presence of a new millimetre continuum gap at 82 au, coincident with similar features seen in optical/near-infrared scattered light and millimetre molecular line observations. Examination of the fit residuals confirms the presence of the previously reported au-scale continuum excess at 52 au (P.A. = 242.5 degrees). Our results demonstrate the utility of combining deep, moderate resolution observations with super-resolution analysis techniques to probe the faintest regions of protoplanetary discs.
