论文标题

趋势高对比度成像调查。 viii。基准对象的汇编

The TRENDS High-contrast Imaging Survey. VIII. Compendium of Benchmark Objects

论文作者

Gonzales, Erica J., Crepp, Justin R., Bechter, Eric B., Wood, Charlotte M., Johnson, John Asher, Montet, Benjamin T., Isaacson, Howard, Howard, Andrew W.

论文摘要

微弱的恒星和近代物体的物理特性通常依赖于间接的,依赖模型的估计值。例如,通常使用依赖年龄且尚未正确校准的进化模型来推断棕色矮人的质量。为了确定新的基准对象来测试低质量恒星和替代模型,我们已经通过多普勒光谱仪高对比度成像程序进行了全面的自适应光学调查,作为目标基准对象的一部分。使用凯克(Keck)高分辨率梯形光谱仪中的传统径向速度测量值,我们已经确定了几十个显示长期多普勒加速度的恒星。我们介绍了该活动的后续高对比度观察结果,并报告了31个共同移动同伴以及11个强大的候选同伴的发现,以确定良好的视差和金属价值的太阳能型明星。这种性质的基准对象适合轨道确定,动态质量估计和独立的组成评估。该基准对象的这种汇编将作为一个方便的测试组,以证实氢融合极限附近的理论进化和大气模型。

The physical properties of faint stellar and substellar objects often rely on indirect, model-dependent estimates. For example, the masses of brown dwarfs are usually inferred using evolutionary models, which are age dependent and have yet to be properly calibrated. With the goal of identifying new benchmark objects to test low-mass stellar and substellar models, we have carried out a comprehensive adaptive optics survey as part of the TaRgetting bENchmark-objects with the Doppler Spectroscopy high-contrast imaging program. Using legacy radial velocity measurements from High Resolution Echelle Spectrometer at Keck, we have identified several dozen stars that show long-term Doppler accelerations. We present follow-up high-contrast observations from the campaign and report the discovery of 31 co-moving companions, as well as 11 strong candidate companions, to solar-type stars with well-determined parallax and metallicity values. Benchmark objects of this nature lend themselves to orbit determinations, dynamical mass estimates, and independent compositional assessment. This compendium of benchmark objects will serve as a convenient test group to substantiate theoretical evolutionary and atmospheric models near the hydrogen fusing limit.

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