论文标题
与Fizeau干涉法的高对比度成像：Altair的情况
High contrast imaging with Fizeau interferometry: The case of Altair
论文作者
论文摘要
大型双筒望远镜（LBT）具有两个8.4 m的主镜，它们可以在“ fizeau”干涉模式下相干地组合。原则上，Fizeau PSF可以以单个8.4 m望远镜的自适应 - 播种校正的PSF的分辨率探测结构的探测。在这项工作中，我们检查了附近的恒星Altair（5.13 PC，类型A7V，$ \ sim $ 100s Myr至$ \ $ \ $ \ $ \ $ \ $ 1.4 GYR），在fizeau模式下，LBT为Br- $α$（4.05 $ $ m），并带出Angular微分成像以寻找伴侣。这项工作介绍了第一个填充量LBT Fizeau Science数据集，该数据集受益于提供主动相位控制的校正镜。 In the analysis of the $λ/D$ angular regime, the sensitivity of the dataset is down to $\approx$0.5 $M_{\odot}$ at 1" for a 1.0 Gyr system. This sensitivity remains limited by the small amount of integration time, which is in turn limited by the instability of the Fizeau PSF. However, in the Fizeau fringe regime we attain sensitivities of $Δm \approx 5 $在0.2英寸处，并将约束1.3 $ m _ {\ odot} $降低到$ \ $ \ $ 0.15的内部角度，比任何先前发表的直接成像Altair的直接成像是该类型的未来数据的探路者。仪器，特别是相检测器。
The Large Binocular Telescope (LBT) has two 8.4-m primary mirrors that produce beams that can be combined coherently in a "Fizeau" interferometric mode. In principle, the Fizeau PSF enables the probing of structure at a resolution up to three times better than that of the adaptive-optics-corrected PSF of a single 8.4-m telescope. In this work, we examined the nearby star Altair (5.13 pc, type A7V, $\sim$100s Myr to $\approx$1.4 Gyr) in the Fizeau mode with the LBT at Br-$α$ (4.05 $μ$m) and carried out angular differential imaging to search for companions. This work presents the first filled-aperture LBT Fizeau science dataset to benefit from a correcting mirror which provides active phase control. In the analysis of the $λ/D$ angular regime, the sensitivity of the dataset is down to $\approx$0.5 $M_{\odot}$ at 1" for a 1.0 Gyr system. This sensitivity remains limited by the small amount of integration time, which is in turn limited by the instability of the Fizeau PSF. However, in the Fizeau fringe regime we attain sensitivities of $Δm \approx 5$ at 0.2" and put constraints to companions of 1.3 $M_{\odot}$ down to an inner angle of $\approx$0.15", closer than any previously published direct imaging of Altair. This analysis is a pathfinder for future datasets of this type, and represents some of the first steps to unlocking the potential of the first ELT. Fizeau observations will be able to reach dimmer targets with upgrades to the instrument, in particular the phase detector.
