One limitation in characterizing exoplanet candidates is the availability of infrared, high-resolution spectrographs. An important factor in the scarcity of high precision IR spectrographs is the high cost of these instruments. We present a new optical design, which leads to a cost-effective solution. Our instrument is a high-resolution (R = 60,000) infrared spectrograph with a R6 Echelle grating and an image slicer. We compare the best possible performance of quasi-Littrow and White Pupil setups, and prefer the latter because it achieves higher image quality. The instrument is proposed for the University of Tokyo Atacama Observatory (TAO) 6.5 m telescope in Chile. The Tao Aiuc high Resolution (d) Y band Spectrograph (TARdYS) covers 0.843-1.117 μ m. To reduce the cost, we squeeze 42 spectral orders onto a 1K detector with a semi-cryogenic solution. We obtain excellent resolution even when taking realistic manufacturing and alignment tolerances as well as thermal variations into account. In this paper, we present early results from the prototype of this spectrograph at ambient temperature.

中文翻译：

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TARDYS：使用 R6 阶梯光栅的 TAO 系外行星猎人的设计和原型

表征系外行星候选者的一个限制是红外、高分辨率光谱仪的可用性。高精度红外光谱仪稀缺的一个重要因素是这些仪器的高成本。我们提出了一种新的光学设计，可提供具有成本效益的解决方案。我们的仪器是高分辨率 (R = 60,000) 红外光谱仪，带有 R6 阶梯光栅和图像切片器。我们比较了 quasi-Littrow 和 White Pupil 设置的最佳性能，更喜欢后者，因为它可以实现更高的图像质量。该仪器被提议用于智利的东京大学阿塔卡马天文台 (TAO) 6.5 m 望远镜。Tao Aiuc 高分辨率 (d) Y 波段光谱仪 (TARdYS) 覆盖 0.843-1.117 μ m。为了降低成本，我们使用半低温解决方案将 42 个光谱级压缩到 1K 检测器上。即使考虑到实际的制造和对准公差以及热变化，我们也能获得出色的分辨率。在本文中，我们展示了该光谱仪在环境温度下的原型的早期结果。