2005CBET..345....2L

Leonard adds that similarly obtained CCD spectra of SN 2005ms (cf. IAUC 8651) show it to be of type Ia, with a spectral-feature age (Riess et al. 1997, A.J. 114, 722) of about 3 days past maximum brightness. Adopting the NED recession velocity of 7556 km/s for the host galaxy (from de Vaucouleurs et al. 1991, Third Reference Catalogue of Bright Calaxies, Version 3.9), the expansion velocity derived from the minimum of the Si II 635.5-nm line is 13300 km/s, which is somewhat higher than is typical for this evolutionary stage. Preliminary reduction of the red-side spectropolarimetry (range 560-900 nm) indicates a low overall observed polarization level (< 0.4 percent) but with a significant modulation of about 0.5 percent detected across the Si II 635.5-nm absorption trough.