December 2, 2025The Astrophysical JournalOpen Access

Spectropolarimetric Evolution Reveals Dual-axis Ejecta in the Atypical Magnetar-powered SN 2012au

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SN 2012au exhibited notable polarization levels at 0.87% ± 0.05%, indicating significant asymmetry.
Significant continuum polarization showed a global photospheric departure from spherical symmetry, ranging 10%−40%.
Analysis of polarimetric data revealed dual-axis ejecta structures with implications for magnetar-driven dynamics.
Polarization changes in He i lines indicated rapid, helium-rich material concentrated near the poles.

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Observational analysis revealed polarization and asymmetry in SN 2012au's photosphere, suggesting magnetar dynamics influence ejecta structure.

DeSoto et al. (2025) studied this question.

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Observational analysis revealed polarization and asymmetry in SN 2012au's photosphere, suggesting magnetar dynamics influence ejecta structure.