Comparative Direct Analysis of Type Ia Supernova Spectra. II. Maximum Light | Zendy

David Branch | Zendy; Leeann Chau Dang | Zendy; Nicholas R. Hall | Zendy; Wesley Ketchum | Zendy; Mercy Melakayil | Zendy; J. Parrent | Zendy; M. A. Troxel | Zendy; D. Casebeer | Zendy; David J. Jeffery | Zendy; E. Baron | Zendy

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Comparative Direct Analysis of Type Ia Supernova Spectra. II. Maximum Light

Author(s) -

David Branch,

Leeann Chau Dang,

Nicholas R. Hall,

Wesley Ketchum,

Mercy Melakayil,

J. Parrent,

M. A. Troxel,

D. Casebeer,

David J. Jeffery,

E. Baron

Publication year - 2006

Publication title -

publications of the astronomical society of the pacific

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.294

H-Index - 172

eISSN - 1538-3873

pISSN - 0004-6280

DOI - 10.1086/502778

Subject(s) - supernova , spectral line , astrophysics , physics , line (geometry) , light curve , type (biology) , absorption spectroscopy , astronomy , optics , biology , mathematics , geometry , ecology

A comparative study of near-maximum-light optical spectra of 24 Type Iasupernovae (SNe Ia) is presented. The spectra are quantified in two ways, andassigned to four groups. Seven "core-normal" SNe Ia have very similar spectra,except for strong high-velocity CaII absorption in SN 2001el. Seven SNe Ia areassigned to a "broad-line" group, the most extreme of which is SN 1984A. FiveSNe Ia, including SN 1991bg, are assigned to a "cool" group. Five SNe Ia,including SN 1991T, are assigned to a "shallow-silicon" group. Comparisons withSYNOW synthetic spectra provide a basis for discussion of line identifications,and an internally consistent quantification of the maximum-light spectroscopicdiversity among SNe Ia. The extent to which SN Ia maximum-light spectra appearto have a continuous distribution of properties, rather than consisting ofdiscrete subtypes, is discussed.Comment: 38 pages including 14 figures and 5 tables, submitted to PAS

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