Evidence for Asphericity in a Subluminous Type Ia Supernova: Spectropolarimetry of SN 1999by

D. Andrew Howell, Peter Hoeflich, Lifan Wang +1

We present polarization spectra near maximum light for the strongly subluminous Type Ia supernova 1999by that show that the supernova is intrinsically polarized. SN 1999by has an o…