Ultracool dwarf benchmarks with Gaia primaries

Ultracool dwarf benchmarks with Gaia primaries
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Ultracool 矮人基准与盖亚初选

DOI:
10.1093/mnras/stx1500
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发表时间:
2017
影响因子:
4.8
通讯作者:
Marocco F
Marocco F
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Marocco F

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我们探索了GAIA在基准超冷/棕矮星伴星领域的潜力,并给出了对富金属/贫金属系统的初步搜索结果。产生并评估了一个模拟的可分辨超冷矮星伴星群。在∼级别中,24000个伴星应该可以通过大规模的地面和空间测量(包括晚期M、L、T和Y类型)在银河面(10 度)之外被识别出来。我们的模拟伴随参数空间包括0.02≤M/M⊙≤0.1、0.1≤AGE/GYR≤14和−2.5≤[Fe/H]≤0.5,系统要求具有虚警概率<10−4,基于对共同距离、共同自行和/或共同径向速度的投影间隔和预期约束。在这个大群体中,我们确定了更稀有系统的较小目标子集,其集体性质仍然跨越整个群体参数空间,以及包含主星的系统,这些系统是很好的年龄校准器。我们的模拟分析导致了一系列关于候选者选择和观察跟踪的建议,这些建议可以识别∼500不同的GAAI标记。为了测试我们方法和模拟的准确性,我们的初步搜索使用了UKIRT红外深空勘测和斯隆数字天空勘测来选择次级天体,初级天体的参数来自Tycho-2,径向速度实验,大天空区域多目标光纤光谱望远镜和Tycho-Gaia天体测量解决方案。我们确定并跟踪了13个新的基准。其中包括M8-L2伴体,金属丰度限制在质量上各不相同,但在−0.39≤[Fe/H]≤+0.36范围内很坚固,预计物理分离范围为0.6 <S/Kau <76。展望未来,GAIA提供了非常高产量的基准系统,从这些基准系统中,不同的子样本可能能够校准一系列基本的超冷/亚恒星理论和观测。
We explore the potential ofGaiafor the field of benchmark ultracool/brown dwarf companions, and present the results of an initial search for metal-rich/metal-poor systems. A simulated population of resolved ultracool dwarf companions toGaiaprimary stars is generated and assessed. Of the order of ∼24 000 companions should be identifiable outside of the Galactic plane (|b| > 10 deg) with large-scale ground- and space-based surveys including late M, L, T and Y types. Our simulated companion parameter space covers 0.02 ≤M/M⊙≤ 0.1, 0.1 ≤ age/Gyr ≤ 14 and −2.5 ≤ [Fe/H] ≤ 0.5, with systems required to have a false alarm probability <10−4, based on projected separation and expected constraints on common distance, common proper motion and/or common radial velocity. Within this bulk population, we identify smaller target subsets of rarer systems whose collective properties still span the full parameter space of the population, as well as systems containing primary stars that are good age calibrators. Our simulation analysis leads to a series of recommendations for candidate selection and observational follow-up that could identify ∼500 diverseGaiabenchmarks. As a test of the veracity of our methodology and simulations, our initial search uses UKIRT Infrared Deep Sky Survey and Sloan Digital Sky Survey to select secondaries, with the parameters of primaries taken from Tycho-2, Radial Velocity Experiment, Large sky Area Multi-Object fibre Spectroscopic Telescope and Tycho–GaiaAstrometric Solution. We identify and follow up 13 new benchmarks. These include M8–L2 companions, with metallicity constraints ranging in quality, but robust in the range −0.39 ≤ [Fe/H] ≤ +0.36, and with projected physical separation in the range 0.6 <s/kau < 76. Going forward,Gaiaoffers a very high yield of benchmark systems, from which diverse subsamples may be able to calibrate a range of foundational ultracool/sub-stellar theory and observation.
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DOI: 10.1093/mnras/stw061
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影响因子: 4.8
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