CRIRES User Manual
Doc. Number: ESO-254264
Doc. Version: P109.4
Issued on:
2021-12-01
Page:
36 of 99
Document Classification: ESO Internal Use [Confidential for Non-ESO Staff]
4.5 Characteristics of the Spectro-Polarimetry Unit (SPU)
Figure
28
shows the throughput of the SPU, respectively for circular and linear polarimetry.
Figure 28: Measurements of the throughput of the Spectro-Polarimetry Unit (SPU).
Figure 29. The Stokes V polarization is shown for the star Gamma Equ (H=4.18) at both
nodding positions A and B, taken with the 0.2" wide slit;; for comparison, we show the
performance of the Spirou spectrograph. The upper panel depicts a wavelength chunk in
the J-band, while the lower panel one in the K-band. The exposure time of one exposure
