ALMA 2D super-resolution imaging of Taurus–Auriga protoplanetary disks: Probing statistical properties of disk substructures

IF 2.2 4区 物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS
Masayuki Yamaguchi, Takayuki Muto, Takashi Tsukagoshi, Hideko Nomura, Naomi Hirano, Takeshi Nakazato, Shiro Ikeda, Motohide Tamura, Ryohei Kawabe
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Abstract

In the past decade, ALMA observations of protoplanetary disks revealed various substructures including gaps and rings. Their origin of substructures may be probed through statistical studies of their physical properties. We present the analyses of archival ALMA Band 6 continuum data of 43 disks (39 Class II and four Herbig Ae) in the Taurus–Auriga region. We employ a novel 2D super-resolution imaging technique based on sparse modeling to obtain images with high fidelity and spatial resolution. As a result, we have obtained images with spatial resolutions comparable to a few au (${0_{.}^{\prime\prime}02}$–${0_{.}^{\prime\prime}1}$), which is two to three times better than conventional CLEAN methods. All dust disks are spatially resolved, with the radii ranging from 8 to 238 au with a median radius of 45 au. Half of the disks harbor clear gap structures, the radial locations of which show a bimodal distribution with peaks at ≲20 au and ≳30 au. We also see structures indicating weak gaps at all the radii in the disk. We find that the widths of these gaps increase with their depths, which is consistent with the model of planet–disk interactions. The inferred planet mass–orbital radius distribution indicates that the planet distribution is analogous to our solar system. However, planets with Neptune mass or lower may exist in all the radii.
金牛座-北极星原行星盘的 ALMA 二维超分辨率成像:探测盘子亚结构的统计特性
在过去十年中,ALMA 对原行星盘的观测揭示了包括间隙和环在内的各种亚结构。亚结构的起源可以通过对其物理特性的统计研究来探测。我们展示了对金牛座-Auriga 地区 43 个星盘(39 个 II 类和 4 个 Herbig Ae)的 ALMA Band 6 存档连续波数据的分析。我们采用了一种基于稀疏建模的新型二维超分辨率成像技术,以获得高保真和高空间分辨率的图像。因此,我们获得的图像空间分辨率相当于几au(${0_{.}^{prime\prime}02}$-${0_{.}^{prime\prime}1}$),是传统CLEAN方法的两到三倍。所有尘埃盘都是空间分辨的,半径从 8 到 238 au 不等,中位半径为 45 au。半数的尘埃盘具有明显的间隙结构,其径向位置呈双峰分布,峰值分别位于 ≲20 au 和 ≳30 au。我们还看到在磁盘的所有半径上都有显示弱间隙的结构。我们发现这些间隙的宽度随着深度的增加而增加,这与行星-圆盘相互作用模型是一致的。推断出的行星质量-轨道半径分布表明,行星分布与太阳系类似。然而,质量为海王星或更小的行星可能存在于所有半径中。
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来源期刊
Publications of the Astronomical Society of Japan
Publications of the Astronomical Society of Japan 地学天文-天文与天体物理
CiteScore
4.10
自引率
13.00%
发文量
98
审稿时长
4-8 weeks
期刊介绍: Publications of the Astronomical Society of Japan (PASJ) publishes the results of original research in all aspects of astronomy, astrophysics, and fields closely related to them.
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