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We present a characterization of CasPol, a dual-beam polarimeter mounted atthe 2.15 meter Jorge Sahade Telescope, located at the Complejo Astron\'omico ElLeoncito, Argentina. The telescope is one of the few available meter-sizedoptical telescopes located in the Southern Hemisphere hosting a polarimeter. Tocarry out this work we collected photo-polarimetric data along five observingcampaigns, the first one during January, 2014, and the remaining ones spreadbetween August, 2017 and March, 2018. The data were taken through theJohnson-Cousins V, R and I filters. Along the campaigns, we observed eightunpolarized and four polarized standard stars. Our analysis beguncharacterizing the impact of seeing and aperture into the polarimetricmeasurements, defining an optimum aperture extraction and setting a clear limitfor seeing conditions. Then, we used the unpolarized standard stars tocharacterize the level of instrumental polarization, and to assess the presenceof polarization dependent on the position across the charge coupled-device.Polarized standard stars were investigated to quantify the stability of theinstrument with wavelength. Specifically, we find that the overall instrumentalpolarization of CasPol is $\sim 0.2 \%$ in the V, R and I bands, with anegligible polarization dependence on the position of the stars on thedetector. The stability of the half-wave plate retarder is about 0.35 degrees,making CasPol comparable to already existing instruments. We also provide newmeasurements in the three photometric bands for both the unpolarized andpolarized standard stars. Finally, we show scientific results, illustrating thecapabilities of CasPol for precision polarimetry of relatively faint objects.

Dual-Beam Optical Linear Polarimetry from Southern Skies. Characterisation of CasPol for high precision polarimetry