A DISK-BASED DYNAMICAL CONSTRAINT ON THE MASS OF THE YOUNG BINARY DQ TAU
A DISK-BASED DYNAMICAL CONSTRAINT ON THE MASS OF THE YOUNG BINARY DQ TAU
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DOI：
10.3847/0004-637x/818/2/156
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发表时间：
2016-02-20
影响因子：
4.9
通讯作者：
Latham, D. W.
中科院分区：
文献类型：
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作者：
Czekala, I.;Andrews, S. M.;Latham, D. W.
本文介绍了阿塔卡马大型毫米/亚毫米阵列（ALMA）对DQ CO J = 2-1线发射的新观测结果。Tau环二进制盘。这些数据用于在正演推理框架中层析重建开普勒盘速度场，从而提供对DQ质量的动态约束。Tau二进制的M-* = 1.27(-0.27)(+0.46)M（圆点）。这些结果与基于长期监测恒星径向速度的双线系统的更新和改进的轨道解决方案进行了比较。这两个对双星质量的独立动力学约束是非常一致的：综合起来，它们证明了DQ。Tau系统质量为1.21 +/- 0.26 m圆点，盘和双星轨道平面在3度内对齐（3西格玛置信度）。对主序前恒星演化的各种理论模型的预测也与这些质量一致，尽管由于各个组成部分的光球特性的不确定性挥之不去，更详细的比较是困难的。DQ。Tau是第三个几乎相等质量的双线双星，它有一个环双星盘，用这两种独立的技术动态地“称重”：所有的结果都是一致的，验证了基于盘的方法的整体准确性，并证明了它可以被强有力地应用于年轻的单星的大样本，因为ALMA的运作已经达到了满负荷。
We present new Atacama Large Millimeter/Submillimeter Array (ALMA) observations of CO J = 2-1 line emission from the DQ. Tau circumbinary disk. These data are used to tomographically reconstruct the Keplerian disk velocity field in a forward-modeling inference framework, and thereby provide a dynamical constraint on the mass of the DQ. Tau binary of M-* = 1.27(-0.27)(+0.46)M(circle dot). Those results are compared with an updated and improved orbital solution for this double-lined system based on long-term monitoring of its stellar radial velocities. Both of these independent dynamical constraints on the binary mass are in excellent agreement: taken together, they demonstrate that the DQ. Tau system mass is 1.21 +/- 0.26 M-circle dot and that the disk and binary orbital planes are aligned within 3 degrees (at 3 sigma confidence). The predictions of various theoretical models for pre-main-sequence stellar evolution are also consistent with these masses, though more detailed comparisons are difficult due to lingering uncertainties regarding the photospheric properties of the individual components. DQ. Tau is the third, nearly equal-mass, double-lined spectroscopic binary with a circumbinary disk that has been dynamically "weighed" with these two independent techniques: all show consistent results, validating the overall accuracy of the disk-based approach and demonstrating that it can be robustly applied to large samples of young, single stars as ALMA ramps up to operations at full capacity.