Inverted K-band polarisation fraction ($I_{\text{tot}}/\sqrt{Q^2+U^2}$) map of LkCa 15 system. Planets with low polarisation, if they exist, are overlaid on a backdrop of highly polarised light coming from the disc, resulting in a robust discrimination caused by a high S/N. However, there is no unambiguous planetary signature in this image. A map value of 14 corresponds to a polarisation of roughly 1/14 ≈ 7%.