The Disk Substructures at High Angular Resolution Project (DSHARP). I. Motivation, Sample, Calibration, and Overview
The Disk Substructures at High Angular Resolution Project (DSHARP). I. Motivation, Sample, Calibration, and Overview
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DOI：
10.3847/2041-8213/aaf741
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发表时间：
2018-12-20
影响因子：
7.9
通讯作者：
Ricci, Luca
中科院分区：
文献类型：
--
作者：
Andrews, Sean M.;Huang, Jane;Ricci, Luca
我们介绍的磁盘子结构在高角分辨率项目（DSHARP），最初的大型计划之一，进行了与阿塔卡马大型毫米/亚毫米阵列（阿尔马）。DSHARP的主要目标是寻找和表征固体粒子的空间分布的子结构的样本附近的20个原行星盘，使用非常高的分辨率（类似于0。035，或5 Au，FWHM）观测其240 GHz（1.25 mm）连续谱发射。这些数据提供了第一个均匀的外观在磁盘中的小尺度功能，直接相关的行星形成过程，量化其患病率，形态，空间尺度，间距，对称性和振幅，为目标与各种磁盘和恒星主机属性。我们发现，这些子结构是无处不在的，在这个样本的大，明亮的磁盘。它们最常表现为同心的、狭窄的发射环和耗尽的间隙，尽管在某些情况下也存在大规模的螺旋图案和小的弧形方位角不对称。这些子结构存在于一个很宽的盘半径范围内（从几个天文单位到100多个Au），通常是紧凑的（小于或接近10个Au），并显示出很宽的振幅范围（亮度对比）。在这里，我们讨论了该项目的动机，描述了调查设计和样本属性，详细说明了观测和数据校准，强调了一些基本结果，并提供了一个总体概述的关键结论，在一系列随附的文章中更详细地介绍。DSHARP数据（包括视频、图像、校准脚本等）在https://almascience.org/alma-data/lp/DSHARP上发布供社区使用。
We introduce the Disk Substructures at High Angular Resolution Project (DSHARP), one of the initial Large Programs conducted with the Atacama Large Millimeter/submillimeter Array (ALMA). The primary goal of DSHARP is to find and characterize substructures in the spatial distributions of solid particles for a sample of 20 nearby protoplanetary disks, using very high resolution (similar to 0.'' 035, or 5 au, FWHM) observations of their 240 GHz (1.25 mm) continuum emission. These data provide a first homogeneous look at the small-scale features in disks that are directly relevant to the planet formation process, quantifying their prevalence, morphologies, spatial scales, spacings, symmetry, and amplitudes, for targets with a variety of disk and stellar host properties. We find that these substructures are ubiquitous in this sample of large, bright disks. They are most frequently manifested as concentric, narrow emission rings and depleted gaps, although large-scale spiral patterns and small arc-shaped azimuthal asymmetries are also present in some cases. These substructures are found at a wide range of disk radii (from a few astronomical units to more than 100 au), are usually compact (less than or similar to 10 au), and show a wide range of amplitudes (brightness contrasts). Here we discuss the motivation for the project, describe the survey design and the sample properties, detail the observations and data calibration, highlight some basic results, and provide a general overview of the key conclusions that are presented in more detail in a series of accompanying articles. The DSHARP data-including visibilities, images, calibration scripts, and more-are released for community use at https://almascience.org/alma-data/lp/DSHARP.