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Aims. Core-collapse supernovae may show significant polarization that impliesnon-spherically symmetric explosions. We observed the type II-plateau SN 2005afusing optical polarimetry in order to verify whether any asphericity is presentin the supernova temporal evolution. Methods. We used the IAGPOL imagingpolarimeter to obtain optical linear polarization measurements in R (fiveepochs) and V (one epoch) broadbands. Interstellar polarization was estimatedfrom the field stars in the CCD frames. The optical polarimetric monitoringbegan around one month after the explosion and lasted ~30 days, between theplateau and the early nebular phase. Results. The weighted mean observedpolarization in R band was [1.89 +/- 0.03]% at position angle (PA) 54 deg.After foreground subtraction, the level of the average intrinsic polarizationfor SN 2005af was ~0.5% with a slight enhancement during the plateau phase anda decline at early nebular phase. A rotation in PA on a time scale of days wasalso observed. The polarimetric evolution of SN 2005af in the observed epochsis consistent with an overall asphericity of ~20% and an inclination of ~30deg. Evidence for a more complex, evolving asphericity, possibly involvingclumps in the SN 2005af envelope, is found.Comment: 6 pages, 5 figures, to be published A&

Optical polarimetric monitoring of the type II-plateau SN 2005af