Comparative direct analysis of type Ia supernova spectra. II. Maximum light

被引：233

作者：

Branch, D ^{[1
]}

Dang, LC ^{[1
]}

Hall, N ^{[1
]}

Ketchum, W ^{[1
]}

Melakayil, M ^{[1
]}

Parrent, J ^{[1
]}

Troxel, MA ^{[1
]}

Casebeer, D ^{[1
]}

Jeffery, DJ ^{[1
]}

Baron, E ^{[1
]}

机构：

[1] Univ Oklahoma, Homer L Dodge Dept Phys & Astron, Norman, OK 73019 USA

来源：

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC | 2006年 / 118卷 / 842期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1086/502778

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A comparative study of near-maximum-light optical spectra of 24 Type Ia supernovae (SNe Ia) is presented. The spectra are assigned to four groups. Seven "core-normal" SNe Ia have very similar spectra, except for strong, high-velocity Ca II absorption in SN 2001el. Seven SNe Ia are assigned to a "broad-line" group, the most extreme of which is SN 1984A. Five SNe Ia, including SN 1991bg, are assigned to a "cool" group. Five SNe Ia, including SN 1991T, are assigned to a "shallow-silicon" group. Comparisons with SYNOW synthetic spectra provide a basis for discussion of line identifications and an internally consistent quantification of the maximum-light spectroscopic diversity among SNe Ia. The extent to which SN Ia maximum-light spectra appear to have a continuous distribution of properties, rather than consist of discrete subtypes, is discussed.

引用

页码：560 / 571

页数：12

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