Polarimetric efficiency in H band as a function of the parallactic angle and altitude angle when the derotator is in field-tracking mode without an additional derotator offset. The dashed line shows the parallactic and altitude angle of TW Hydrae across the sky, with the solid line showing the angles during the SPHERE observation. Default derotator settings (north is up on the detector) clearly yield mediocre polarimetric efficiencies.
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.