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Blondin, S; Matheson, T; Kirshner, R P; Mandel, K S; Berlind, P; Calkins, M; Challis, P; Garnavich, P M; Jha, S W; Modjaz, M; Riess, A G; Schmidt, B P
The Astronomical journal, 05/2012, Volume: 143, Issue: 5Journal Article
We present 2603 spectra of 462 nearby Type Ia supernovae (SNe Ia), including 2065 previously unpublished spectra, obtained during 1993-2008 through the Center for Astrophysics Supernova Program. Based on nebular spectra of 27 SNe Ia, we find no relation between the FWHM of the iron emission feature at ~4700A and delta msub 15(B) after removing the two low-luminosity SN 1986G and SN 1991bg, suggesting that the peak luminosity is not strongly dependent on the kinetic energy of the explosion for most SNe Ia. Finally, we confirm the correlation of velocity shifts in some nebular lines with the intrinsic B-V color of SNe Ia at maximum light, although several outliers suggest a possible non-monotonic behavior for the largest blue-shifts.
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