arXiv 1111.00102011-11astro-ph.SR

过渡盘化学和ALMA的未来前景

Transition disk chemistry and future prospects with ALMA

L. Ilsedore Cleeves, Edwin A. Bergin, Thomas J. Bethell, Nuria Calvet, Jeffrey K. J. Fogel, Juergen Sauter, Sebastian Wolf

备注：: 6 pages, 4 figures. Accepted to ApJ Letters
DOI：: 10.1088/2041-8205/743/1/L2

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摘要：

我们探讨了一个磁盘的化学结构，包含一个大的中心间隙的R ~ 45 AU，是常见的过渡盘系统。在我们的化学模型中，一个内部空洞被清除的圆盘，中平面对中心恒星显露出来，因此它被直接照射。截断半径处的中平面材料允许再处理的光学加热辐射，但对光离解紫外线不透明，从而产生气相分子丰富的环境。因此，盘的中平面，否则将占主导地位的一个完整的磁盘几乎完全重元素冻结，应该成为可观察的分子发射。如果这一预测是正确的，这将为阿塔卡马大型毫米/亚毫米阵列（ALMA）的观测带来令人兴奋的前景，因为内部过渡区因此应该很容易被检测和解决，特别是使用高密度中平面气体中激发的高J旋转跃迁。因此，这样的观测将有可能为我们提供一个直接的物理和化学探测在这个积极发展的接口。

英文摘要：

We explore the chemical structure of a disk that contains a large central gap of R ~ 45 AU, as is commonly seen in transitional disk systems. In our chemical model of a disk with a cleared inner void, the midplane becomes revealed to the central star so that it is directly irradiated. The midplane material at the truncation radius is permissive to reprocessed optical heating radiation, but opaque to the photo-dissociating ultraviolet, creating an environment abundant in gas-phase molecules. Thus the disk midplane, which would otherwise for a full disk be dominated by near complete heavy element freeze-out, should become observable in molecular emission. If this prediction is correct this has exciting prospects for observations with the Atacama Large Millimeter/Submillimeter Array (ALMA), as the inner transition region should thus be readily detected and resolved, especially using high-J rotational transitions excited in the high density midplane gas. Therefore such observations will potentially provide us with a direct probe of the physics and chemistry at this actively evolving interface.

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