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arXiv 1804.00529astro-ph.EPastro-ph.SR
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类太阳年轻恒星PDS 70过渡盘中气体和尘埃分布的差异

Differences in the gas and dust distribution in the transitional disk of a sun-like young star, PDS 70

Zachary C. Long, Eiji Akiyama, Michael Sitko, Rachel B. Fernandes, Korash Assani, Carol A. Grady, Michel Cure, Ruobing Dong, Misato Fukagawa, Yasuhiro Hasegawa,… 展开作者

Zachary C. Long, Eiji Akiyama, Michael Sitko, Rachel B. Fernandes, Korash Assani, Carol A. Grady, Michel Cure, Ruobing Dong, Misato Fukagawa, Yasuhiro Hasegawa, Jun Hashimoto, Thomas Henning, Shu-Ichiro Inutsuka, Stefan Kraus, Jungmi Kwon, Carey M. Lisse, Hauyu Baobabu Liu, Satoshi Mayama, Takayuki Muto, Takao Nakagawa, Michihiro Takami, Motohide Tamura, Thayne Currie, John P. Wisniewski, Yi Yang

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摘要：

我们提供了年轻的类太阳恒星PDS 70周围物质盘的ALMA 0.87 mm连续谱、HCO+ J=4- 3发射谱线和CO J=3- 2发射谱线数据。这些数据揭示了一个可能存在的两个组成部分的过渡盘系统的径向尘埃间隙为0。“2 +/- 0。“05，在HCO+ J=4- 3矩零图中的方位角间隙，以及在气体数据中的两个桥状特征。有趣的是，这些特征在气盘中没有类似的尘埃盘，使它们特别感兴趣。我们使用Monte Carlo辐射转移代码HOCHUNK 3D（Whitney et al. 2013）对尘埃盘进行了建模，其中使用了两个盘组件。我们发现，有一个径向间隙，从15-60金在所有的晶粒尺寸，这不同于以前的工作。

英文摘要：

We present ALMA 0.87 mm continuum, HCO+ J=4--3 emission line, and CO J=3--2 emission line data of the disk of material around the young, Sun-like star PDS 70. These data reveal the existence of a possible two component transitional disk system with a radial dust gap of 0."2 +/- 0."05, an azimuthal gap in the HCO+ J=4--3 moment zero map, as well as two bridge-like features in the gas data. Interestingly these features in the gas disk have no analogue in the dust disk making them of particular interest. We modeled the dust disk using the Monte Carlo radiative transfer code HOCHUNK3D (Whitney et al. 2013) using a two disk components. We find that there is a radial gap that extends from 15-60 au in all grain sizes which differs from previous work.

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