Observability of planet–disc interactions in CO kinematics
Observability of planet–disc interactions in CO kinematics
复制标题
CO 运动学中行星盘相互作用的可观测性
DOI：
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发表时间：
2018
影响因子：
--
通讯作者：
P. Ben'itez
中科院分区：
文献类型：
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作者：
S. Pérez;S. Casassus;P. Ben'itez
需要有富含气体的星周盘中存在行星的经验证据来约束巨行星形成理论。在这里，我们研究行星盘相互作用产生的运动学模式及其在二氧化碳旋转排放线中的可观测性。我们对单个巨行星进行三维流体动力学模拟，并预测辐射传输的涌现强度场。行星雕刻间隙、螺旋尾流和涡流处的压力梯度具有很强的运动学对应物。 CO(2-1) 线质心 $v_\circ$ 中的等速度等值线揭示了大规模扰动，对应于从低于开普勒旋转到超开普勒旋转以及径向和垂直流动的突然转变。间隙边缘线光学深度的增加也会调节$v_\circ$，但与行星盘相互作用的动态印记相比，这是一个温和的影响。因此，与开普勒自转的大规模偏差使得可以通过分子气体示踪剂的一阶矩图以 ALMA 角分辨率间接探测到行星。这些偏差的强度取决于扰动者的质量。这项初步研究为通过与更详细的模型进行比较最终确定行星的质量铺平了道路。
Empirical evidence of planets in gas-rich circumstellar discs is required to constrain giant planet formation theories. Here we study the kinematic patterns which arise from planet-disc interactions and their observability in CO rotational emission lines. We perform three-dimensional hydrodynamical simulations of single giant planets, and predict the emergent intensity field with radiative transfer. Pressure gradients at planet-carved gaps, spiral wakes and vortices bear strong kinematic counterparts. The iso-velocity contours in the CO(2-1) line centroids $v_\circ$ reveal large-scale perturbations, corresponding to abrupt transitions from below sub-Keplerian to super-Keplerian rotation along with radial and vertical flows. The increase in line optical depth at the edge of the gap also modulates $v_\circ$, but this is a mild effect compared to the dynamical imprint of the planet-disc interaction. The large-scale deviations from the Keplerian rotation thus allow the planets to be indirectly detected via the first moment maps of molecular gas tracers, at ALMA angular resolutions. The strength of these deviations depends on the mass of the perturber. This initial study paves the way to eventually determine the mass of the planet by comparison with more detailed models.
DOI：
10.1088/0004-637x/807/1/2
发表时间：
2015-05
期刊：
The Astrophysical Journal
影响因子：
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作者：
L. Cleeves;E. Bergin;T. J. H. U. O. Michigan;U. Exeter
通讯作者：
L. Cleeves;E. Bergin;T. J. H. U. O. Michigan;U. Exeter