V-band polarimetry of 25 stars with Gaia distances and foreground subtraction maps two dust layers toward zeta Ophiuchi, with a residual component whose average polarization efficiency is 14.1% per magnitude, above the classical 9% limit.
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Extreme Starlight Polarization Efficiency Toward $\zeta$ Ophiuchi: A Case for Line-of-Sight Foreground Subtraction
V-band polarimetry of 25 stars with Gaia distances and foreground subtraction maps two dust layers toward zeta Ophiuchi, with a residual component whose average polarization efficiency is 14.1% per magnitude, above the classical 9% limit.