基于Asgard/NOTT的VLTI L波段消零干涉测量：现状与计划
L-band nulling interferometry at the VLTI with Asgard/NOTT: status and plans
AI总结：
本文介绍了VLTI Asgard套件中L'波段消零干涉仪NOTT的项目进展，涵盖冷机械设计、暖光学实验室首批结果、集成工作及光子芯片表征等相关研发动态。
摘要：
NOTT（前身为Hi-5）是Asgard的L'波段（3.5-4.0微米）消零干涉仪，Asgard是为VLTI访客焦点筹备的仪器套件。NOTT的主要科学目标包括表征：（i）雪线附近的年轻行星系统，这是巨行星形成的关键区域；（ii）宜居带附近的邻近主序星，重点探测可能遮挡类地行星的系外黄道尘。2023-2024年，最终暖光学元件已在鲁汶大学的新实验室采购并组装完成。研究人员使用硫化镧镓（GLS）光子芯片获得了首批干涉条纹和消零测量结果，该芯片也在低温下进行了测试。本文介绍了NOTT项目的整体最新进展，重点关注冷机械设计、使用最终NOTT暖光学元件获得的首批实验室结果，以及正在进行的Asgard集成工作。我们还报告了其他正在进行的工作，例如光子芯片（GLS、LiNbO₃、SiO）的表征、系外行星科学案例的开发、色散控制模块的设计，以及自校准数据缩减软件的进展。
英文摘要：
NOTT (formerly Hi-5) is the L'-band (3.5-4.0~microns) nulling interferometer of Asgard, an instrument suite in preparation for the VLTI visitor focus. The primary scientific objectives of NOTT include characterizing (i) young planetary systems near the snow line, a critical region for giant planet formation, and (ii) nearby main-sequence stars close to the habitable zone, with a focus on detecting exozodiacal dust that could obscure Earth-like planets. In 2023-2024, the final warm optics have been procured and assembled in a new laboratory at KU Leuven. First fringes and null measurements were obtained using a Gallium Lanthanum Sulfide (GLS) photonic chip that was also tested at cryogenic temperatures. In this paper, we present an overall update of the NOTT project with a particular focus on the cold mechanical design, the first results in the laboratory with the final NOTT warm optics, and the ongoing Asgard integration activities. We also report on other ongoing activities such as the characterization of the photonic chip (GLS, LiNbO3, SiO), the development of the exoplanet science case, the design of the dispersion control module, and the progress with the self-calibration data reduction software.
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