No orbital polarization modulation at P_orb or P_orb/2 is detected in combined IXPE data for Cygnus X-1, with 99% upper limits of 0.54-2.13% on P_orb/2 amplitude across 2-8 keV bands, consistent with sensitivity limits.
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Energy-Resolved Limits on Orbital X-ray Polarization Modulation in Cygnus X-1
No orbital polarization modulation at P_orb or P_orb/2 is detected in combined IXPE data for Cygnus X-1, with 99% upper limits of 0.54-2.13% on P_orb/2 amplitude across 2-8 keV bands, consistent with sensitivity limits.