评价H4RG近红外探测器用于精确多普勒径向速度测量的适用性
Assessing the Suitability of H4RG Near Infrared Detectors for Precise Doppler Radial Velocity Measurements
摘要：
在硅灵敏度的波长上，混合结构的碲镉汞（HgCdTe）探测器有望实现对晚型恒星极其精确的径向速度（RV）测量。市场上最先进的近红外（NIR）检测器是HAWAII系列（HxRG）NIR检测器。虽然这种器件的量子效率已被证明是大约百分之九十，这些设备的噪声特性，以及它们如何与RV测量，还有待量化。我们使用数值模拟H4RG阵列产生的各种噪声源的特征。我们使用我们的端到端光谱仪模拟器结合HxRG噪声发生器展示了最近的结果，HxRG噪声发生器模拟了读取噪声的影响，由白噪声，相关和不相关的粉红噪声，交替列噪声和图片帧噪声参数化。还考虑了非线性像素响应、暗电流、余辉和像素间电容（IPC）对RV精度的影响。我们的研究结果具有RV误差预算和仪器噪声地板，可以实现与近红外多普勒光谱仪，利用这种检测器的影响。
英文摘要：
At wavelengths longwards of the sensitivity of silicon, hybrid structured mercury-cadmium-telluride (HgCdTe) detectors show promise to enable extremely precise radial velocity (RV) measurements of late-type stars. The most advanced near infrared (NIR) detector commercially available is the HAWAII series (HxRG) of NIR detectors. While the quantum efficiency of such devices has been shown to be approx ninety percent, the noise characteristics of these devices, and how they relate to RV measurements, have yet to be quantified. We characterize the various noise sources generated by H4RG arrays using numerical simulations. We present recent results using our end-to-end spectrograph simulator in combination with the HxRG Noise Generator, which emulates the effects of read noise, parameterized by white noise, correlated and uncorrelated pink noise, alternating column noise, and picture frame noise. The effects of nonlinear pixel response, dark current, persistence, and interpixel capacitance (IPC) on RV precision are also considered. Our results have implications for RV error budgets and instrument noise floors that can be achieved with NIR Doppler spectrographs that utilize this kind of detector.
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