High-precision broad-band linear polarimetry of early-type binaries - I. Discovery of variable, phase-locked polarization in HD 48099A. Berdyugin, V. Piirola, S. Sadegi, S. Tsygankov, T. Sakanoi, M. Kagitani, M. Yoneda, S. Okano and J. PoutanenA&A, 591 (2016) A92DOI: https://doi.org/10.1051/0004-6361/201528020