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We report the first detection of the X-ray polarization of the brighttransient Swift J1727.8-1613 with the Imaging X-ray Polarimetry Explorer. Theobservation was performed at the beginning of the 2023 discovery outburst, whenthe source resided in the bright hard state. We find a time- andenergy-averaged polarization degree of 4.1%+/-0.2% and a polarization angle of2.2+/-1.3 degrees (errors at 68% confidence level; this translates to about20-sigma significance of the polarization detection). This finding suggeststhat the hot corona emitting the bulk of the detected X-rays is elongated,rather than spherical. The X-ray polarization angle is consistent with thatfound in sub-mm wavelengths. Since the sub-mm polarization was found to bealigned with the jet direction in other X-ray binaries, this indicates that thecorona is elongated orthogonal to the jet.

Discovery of X-ray Polarization from the Black Hole Transient Swift J1727.8-1613