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Bruggen, M. Hajduk, M. Haverkorn, M. Hoeft, M. Iacobelli, M. J. Hardcastle, M. Kadler, M. Kunert-Bajraszewska, M. P\\'erez-Torres, M. Vaccari, P. N. Best, P. Zarka, R. D. Kavanagh, R. J. van Weeren, R. Timmerman, S. Bloot, S. P. O'Sullivan, T. P. Ray, T. W. H. Yiu, T. W. Shimwell","submitted_at":"2022-12-19T19:37:42Z","abstract_excerpt":"We present the detection of 68 sources from the most sensitive radio survey in circular polarisation conducted to date. We use the second data release of the 144 MHz LOFAR Two-metre Sky Survey to produce circularly-polarised maps with median 140 $\\mu$Jy beam$^{-1}$ noise and resolution of 20$''$ for $\\approx$27% of the northern sky (5634 deg$^{2}$). The leakage of total intensity into circular polarisation is measured to be $\\approx$0.06%, and our survey is complete at flux densities $\\geq1$ mJy. A detection is considered reliable when the circularly-polarised fraction exceeds 1%. 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