论文标题
l波段无效的干涉法与Asgard/hi-5：状态和计划
L-band nulling interferometry at the VLTI with Asgard/Hi-5: status and plans
论文作者
论文摘要
HI-5是L'-Band（3.5-4.0 $ $ m）Asgard的高对比度成像器，Asgard是一个仪器套件，为VLTI的访客焦点做准备。该系统已在望远镜的单个UT/衍射极限内进行优化，可用于高对比度和高敏化成像。它被设计为产生频谱分散（r = 20、400或2000）的双铲式零用仪器，以进行自校准目的。在本文中，我们介绍了该项目的更新，其中特别关注整体体系结构，温暖和冷光学的光学机械设计，注射系统以及光子束组合仪的开发。关键的科学项目是调查（i）附近的雪线附近的年轻行星系统，预计大多数巨型行星将形成大多数巨型行星，（ii）附近的主要序列星附近可居住地区域附近的近距离尘埃，在该区域中可能会阻碍地球样行星的检测。我们使用VLTI的新重力+规格和最新的行星形成模型，根据全端到端模拟进行了预期仪器性能的更新。
Hi-5 is the L'-band (3.5-4.0 $μ$m) high-contrast imager of Asgard, an instrument suite in preparation for the visitor focus of the VLTI. The system is optimized for high-contrast and high-sensitivity imaging within the diffraction limit of a single UT/AT telescope. It is designed as a double-Bracewell nulling instrument producing spectrally-dispersed (R=20, 400, or 2000) complementary nulling outputs and simultaneous photometric outputs for self-calibration purposes. In this paper, we present an update of the project with a particular focus on the overall architecture, opto-mechanical design of the warm and cold optics, injection system, and development of the photonic beam combiner. The key science projects are to survey (i) nearby young planetary systems near the snow line, where most giant planets are expected to be formed, and (ii) nearby main sequence stars near the habitable zone where exozodiacal dust that may hinder the detection of Earth-like planets. We present an update of the expected instrumental performance based on full end-to-end simulations using the new GRAVITY+ specifications of the VLTI and the latest planet formation models.
