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Petrucci, R. Emami, R. Taverna, S. Bianchi, S. R. Datta, T. D. Russell, T. Mu\\~noz-Darias, V. Kravtsov, W. Zhang, Y. J. Yang, Y. Zhang","submitted_at":"2024-04-30T14:51:41Z","abstract_excerpt":"We report on the detection of X-ray polarisation in the black-hole X-ray binary Swift J1727.8$-$1613 during its dim hard spectral state by the Imaging X-ray Polarimetry Explorer (IXPE). This is the first detection of X-ray polarisation at the transition from the soft to the hard state in an X-ray binary. We find an averaged 2$-$8 keV polarisation degree of (3.3 ${\\pm}$ 0.4) % and a corresponding polarisation angle of 3{\\deg} ${\\pm}$ 4{\\deg}, which matches the polarisation detected during the rising stage of the outburst, in September$-$October 2023, within 1${\\sigma}$ uncertainty. 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Ingram, A. Ratheesh, A. Veledina, E. Egron, E. Nathan, F. Capitanio, F. Muleri, F. Tombesi, G. Mastroserio, G. Matt, H. Krawczynski, J. A. Garc\\'ia, J. F. Steiner, J. Podgorn\\'y, J. Poutanen, J. Svoboda, K. Hu, L. Marra, M. Brigitte, M. Dov\\v{c}iak, M. Negro, M. N. Iacolina, N. Bollemeijer, N. Castro Segura, N. Rodriguez Cavero, P. Kaaret, P.-O. Petrucci, R. Emami, R. Taverna, S. Bianchi, S. R. Datta, T. D. Russell, T. Mu\\~noz-Darias, V. Kravtsov, W. Zhang, Y. J. Yang, Y. Zhang","submitted_at":"2024-04-30T14:51:41Z","abstract_excerpt":"We report on the detection of X-ray polarisation in the black-hole X-ray binary Swift J1727.8$-$1613 during its dim hard spectral state by the Imaging X-ray Polarimetry Explorer (IXPE). This is the first detection of X-ray polarisation at the transition from the soft to the hard state in an X-ray binary. 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