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Recovery of the X-ray polarisation of Swift J1727.8โˆ’1613 after the soft-to-hard spectral transition

Recovery of the X-ray polarisation of Swift J1727.8โˆ’1613 after the soft-to-hard spectral transition

We report on the detection of X-ray polarisation in the black-hole X-ray binary Swift J1727.8โˆ’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. โ€ฆ