Spectropolarimetry of Type Ia Supernovae

Details Spectropolarimetry of Type Ia Supernovae Spectropolarimetry of Type Ia Supernovae

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20922906c&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #229.06; Bulletin of the American Astronomical Society,

Astronomy and Astrophysics

Astronomy

Scientific paper

I will present some recent results using optical spectropolarimetry as a tool to probe the three-dimensional structure of Type Ia supernovae (SNe Ia). Normal SNe Ia typically have small observed continuum polarizations, which are interpreted as being due to electron scattering in supernova atmospheres with global asphericities. Line polarization features seen in several objects reveal compositional inhomogeneities in the ejecta. In particular, some SNe Ia with high-velocity spectral features formed above the photosphere show strong polarization signatures. Even some normal SNe Ia, such as SN 2004S, show rotations in the polarization angle across photospheric line features of species such as Si II and Ca II. The spectropolarimetric features indicate that the line-forming region in this object cannot share the same global axis of symmetry as the continuum. These observations can be used as a test of three-dimensional numerical models of SN Ia explosion mechanisms.

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