Schematic overview of the telescope and SPHERE/IRDIS, showing the optical components that are relevant for the polarimetric imaging mode. The curved arrows indicate components that rotate during an observation block. Reflections at angles of incidence ≥45° in the instrument are represented with similarly large incidence reflections in the figure. The green beam shows the starlight before color filters are applied, blue represents visible light, and red and orange represent NIR light (the orange beam toward the IFS shows the shorter wavelengths).
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.