Spectral diversity of Type Ia Supernovae

Abstract

We use published spectroscopic and photometric data for 8 Type Ia supernovae to construct a dispersion spectrum for this class of object, showing their diversity over the wavelength range 3700A to 7100A. We find that the B and V bands are the spectral regions with the least dispersion, while the U band below 4100A is more diverse. Some spectral features such as the Si line at 6150A are also highly diverse. We then construct two objective measures of 'peculiarity' by (i) using the deviation of individual objects from the average SN Ia spectrum compared to the typical dispersion and (ii) applying principle component analysis. We demonstrate these methods on several SNe Ia that have previously been classified as peculiar.

arXiv comment8 pages, 8 figures, uses mn2e.cls, accepted for publication by MNRAS

References in corpus (17)

• New Constraints on ${\Omega }_M$, ${\Omega }_{\Lambda }$, and w from an Independent Set of Eleven High-Redshift Supernovae Observed with HST
• The Reddening-Free Decline Rate Versus Luminosity Relationship for Type Ia Supernovae
• The Absolute Luminosities of the Calan/Tololo Type Ia Supernovae
• The diversity of Type Ia Supernovae: evidence for systematics?
• UBVRI Light Curves of 44 Type Ia Supernovae
• Optical Photometry of the Type Ia SN 1999ee and the Type Ib/c SN 1999ex in IC 5179
• K-corrections and Extinction Corrections for Type Ia Supernovae
• The Carnegie Supernova Project: The Low-Redshift Survey
• Supernova 2002bo: inadequacy of the single parameter description
• Optical and Infrared Spectroscopy of SN 1999ee and SN 1999ex
• Chemistry and Star Formation in the Host Galaxies of Type Ia Supervovae
• Cepheid Calibration of the Peak Brightness of SNe Ia. XI. SN 1998aq in NGC 3982
• Using Line Profiles to Test the Fraternity of Type Ia Supernovae at High and Low Redshifts
• The template type Ia supernova 1996X
• Optical Spectra of the Type Ia Supernova 1998aq
• Comparative Direct Analysis of Spectra of Type Ia Supernovae. I. SN 1994D
• Metallicity effect in multi-dimensional SNIa nucleosynthesis

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