Other
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...21110703c&link_type=abstract
American Astronomical Society, AAS Meeting #211, #107.03; Bulletin of the American Astronomical Society, Vol. 39, p.935
Other
Scientific paper
I will present some recent results applying the technique of optical spectropolarimetry to core-collapse supernovae to detect asphericities in the explosions of massive stars. Two recent supernovae in the Virgo Cluster, SN 2006ov and SN 2006my, provide excellent examples. The progenitors of both objects have been identified as red supergiants with masses in the range of 10-15 M_sun. Past examples of similar supernovae have shown low polarization at early times while the photosphere is in the apparently spherical outer envelope, with the measured polarization increasing with time. We obtained late-time spectropolarimetry of these two supernovae, 3-4 months after the explosion. Electron scattering in the aspherical cores of these objects results in intrinsic continuum polarizations as high as 1.5% for SN 2006ov. Such high continuum polarizations are another sign of the ubiquity of large deviations from spherical symmetry in the explosions of normal core-collapse supernovae. In addition, I will present results from multi-epoch spectropolarimetry of the recent Type Ic SN 2007gr.
Chornock Ryan
Filippenko Alexei V.
Foley Ryan J.
Li Wangrong
Silverman Jeffrey M.
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