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Aims.Recent studies have detected linear polarization in L dwarfs in theoptical I band. Theoretical models have been developed to explain thispolarization. These models predict higher polarization at shorter wavelengths.We discuss the polarization in the R and I band of 4 ultra cool dwarfs.Methods.We report linear polarization measurements of 4 ultra cool dwarfs inthe R and I bands using the Intermediate dispersion Spectrograph and ImagingSystem (ISIS) mounted on the 4.2m William Herschel Telescope (WHT). Results.Aspredicted by theoretical models, we find a higher degree of polarization in theR band when compared to polarization in the I band for 3/4 of these ultra cooldwarfs. This suggests that dust scattering asymmetry is caused by oblateness>.We also show how these measurements fit the theoretical models. A case forvariability of linear polarization is found, which suggests the presence ofrandomly distributed dust clouds. We also discuss one case for the presence ofa cold debris disk.

Optical linear polarization in ultra cool dwarfs: A tool to probe dust in the ultra cool dwarf atmospheres