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Design of an afocal telescope for the ARIEL mission

机译：用于ARIEL任务的无源望远镜的设计

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ARIEL (Atmospheric Remote-sensing Infrared Exoplanet Large-survey) is one of the three candidates for the next ESA medium-class science mission (M4) expected to be launched in 2026. This mission will be devoted to observe spectroscopically in the infrared (IR) a large population of known transiting planets in our Galaxy. ARIEL is based on a 1-m class telescope ahead of two spectrometer channels covering the band 1.95 to 7.8 microns. In addition there are four photometric channels: two wide band, also used as fine guidance sensors, and two narrow band. During its 3.5 years operations from L2 orbit, ARIEL will continuously observe exoplanets transiting their host star. The ARIEL design is conceived as a fore-module common afocal telescope that will feed the spectrometer and photometric channels. The telescope optical design is an off-axis portion of a two-mirror classic telescope coupled to a tertiary off-axis paraboloidal mirror providing a collimating output beam. The telescope and optical bench operating temperatures, as well as those of some subsystems, will be monitored and fine tuned/stabilised mainly by means of a thermal control subsystem (TCU - Telescope Control Unit) working in closed-loop feedback and hosted by the main Payload electronics unit, i.e. the Instrument Control Unit (ICU). In this paper the telescope requirements will be given together with the foreseen design. The technical solution chosen to passively cool the telescope unit will be detailed discussed.
机译：ARIEL（大气遥感红外系外行星大调查）是预计于2026年启动的下一次ESA中级科学任务（M4）的三项候选任务之一。该任务将专门用于在红外光谱中进行观察）我们银河系中大量已知的过境行星。 ARIEL基于一个1-m级望远镜，位于覆盖1.95至7.8微米波段的两个光谱仪通道之前。此外，还有四个光度测量通道：两个宽带（也用作精细引导传感器）和两个窄带。在从L2轨道运行3.5年的过程中，ARIEL将不断观察系外行星经过其宿主恒星的过程。 ARIEL设计被认为是一种前模块通用无焦点望远镜，它将为光谱仪和光度学通道提供数据。望远镜的光学设计是双镜经典望远镜的离轴部分，耦合到三轴离轴抛物面镜，提供准直的输出光束。望远镜和光学平台的工作温度，以及某些子系统的温度，将主要通过热控制子系统（TCU-望远镜控制单元）以闭环反馈的方式进行监控和微调/稳定，并由主有效负载电子单元，即仪器控制单元（ICU）。在本文中，望远镜的要求将与可预见的设计一起给出。将详细讨论为被动冷却望远镜单元而选择的技术解决方案。

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