On the Spectroscopic Diversity of Type I[CLC]a[/CLC] Supernovae | Zendy

K. Hatano | Zendy; David Branch | Zendy; Eric J. Lentz | Zendy; E. Baron | Zendy; A. V. Filippenko | Zendy; P. Garnavich | Zendy

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On the Spectroscopic Diversity of Type I[CLC]a[/CLC] Supernovae

Author(s) -

K. Hatano,

David Branch,

Eric J. Lentz,

E. Baron,

A. V. Filippenko,

P. Garnavich

Publication year - 2000

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/318169

Subject(s) - supernova , blueshift , astrophysics , brightness , context (archaeology) , spectral line , absorption (acoustics) , physics , absorption spectroscopy , astronomy , optics , geology , paleontology , photoluminescence

A comparison of the ratio of the depths of two absorption features in thespectra of TypeIa supernovae (SNe Ia) near the time of maximum brightness withthe blueshift of the deep red Si II absorption feature 10 days after maximumshows that the spectroscopic diversity of SNe Ia is multi-dimensional. There isa substantial range of blueshifts at a given value of the depth ratio. We alsofind that the spectra of a sample of SNe Ia obtained a week before maximumbrightness can be arranged in a ``blueshift sequence'' that mimics the timeevolution of the pre-maximum-light spectra of an individual SN Ia, the wellobserved SN 1994D. Within the context of current SN Ia explosion models, wesuggest that some of the SNe Ia in our sample were delayed-detonations whileothers were plain deflagrations.Comment: accepted for publication in ApJ

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