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We present the first polarimetric observations of a Type I superluminoussupernova (SLSN). LSQ14mo was observed with VLT/FORS2 at five different epochsin the V band, with the observations starting before maximum light and spanning26 days in the rest frame (z=0.256). During this period, we do not detect anystatistically significant evolution (< 2$\sigma$) in the Stokes parameters. Theaverage values we obtain, corrected for interstellar polarisation in theGalaxy, are Q = -0.01% ($\pm$ 0.15%) and U = - 0.50% ($\pm$ 0.14%). This lowpolarisation can be entirely due to interstellar polarisation in the SN hostgalaxy. We conclude that, at least during the period of observations and at theoptical depths probed, the photosphere of LSQ14mo does not present significantasymmetries, unlike most lower-luminosity hydrogen-poor SNe Ib/c.Alternatively, it is possible that we may have observed LSQ14mo from a specialviewing angle. Supporting spectroscopy and photometry confirm that LSQ14mo is atypical SLSN I. Further studies of the polarisation of Type I SLSNe arerequired to determine whether the low levels of polarisation are acharacteristic of the entire class and to also study the implications for theproposed explosion models.

Polarimetry of the superluminous supernova LSQ14mo: no evidence for significant deviations from spherical symmetry