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April 18, 2026

Optical polarimetry of the accreting black hole X-ray binary Swift J1727.8-1613 over the state transition and radio ejections

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Authors

ANAnagha P. NitindalaAVAlexandra VeledinaVKVadim Kravtsov

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Overview

Optical polarimetry reveals polarization changes in Swift J1727.8-1613, suggesting misalignment of black hole spin and orbital axis.

Key Points

  • To investigate the optical polarization characteristics of Swift J1727.8-1613 during its outburst and state transitions.
  • Conducted polarimetric observations in the BVR band during the 2023-2024 outburst
  • Monitored changes during the X-ray hard-to-soft state transition and subsequent states
  • Analyzed correlations between polarization and radio ejections
  • Corrected for interstellar polarization effects
  • Detected statistically significant polarization of approximately 1% during the majority of observations
  • Observed a change in polarization corresponding with discrete radio ejections
  • Intrinsic polarization degree remained roughly constant at about 0.3% in the hard-intermediate state
  • The intrinsic polarization angle was approximately -15 degrees, indicating misalignment with the jet axis

Cite This Study

Nitindala et al. (2026) studied this question.

synapsesocial.com/papers/69e3207940886becb653f9a0https://doi.org/10.1051/0004-6361/202558488/pdf
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