Synthetic spectra of hydrodynamic models of type Ia supernovae

被引:215
作者
Nugent, P
Baron, E
Branch, D
Fisher, A
Hauschildt, PH
机构
[1] UNIV OKLAHOMA, DEPT PHYS & ASTRON, NORMAN, OK 73019 USA
[2] UNIV GEORGIA, DEPT PHYS & ASTRON, ATHENS, GA 30602 USA
[3] ARIZONA STATE UNIV, DEPT PHYS & ASTRON, TEMPE, AZ 85287 USA
基金
美国国家科学基金会;
关键词
hydrodynamics; stars; interiors; supernovae; general;
D O I
10.1086/304459
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present detailed non-LTE synthetic spectra of hydrodynamic supernovae (SNe) Ia models. We make no assumptions about the form of the spectrum at the inner boundary, We calculate both Chandrasekhar-mass deflagration models and sub-Chandrasekhar ''helium detonators.'' Gamma-ray deposition is handled in a simple, accurate manner. We have parameterized the storage of energy, which arises from the time-dependent deposition of radioactive decay energy, in a reasonable manner that spans the expected range. We find that the Chandrasekhar-mass deflagration model W7 of Nomoto, Thielemann, & Yokoi shows good agreement with the observed spectra of SN 1992A and SN 1994D, particularly in the UV, where our models are expected to be most accurate. The sub-Chandrasekhar models do not reproduce the UV deficit observed in normal SNe Ia They do bear some resemblance to subluminous SNe Ia, but the shapes of the spectra (i.e., the colors) are opposite that of the observed ones, and the intermediate-mass element lines (such as Si II and Cst II) are extremely weak, which seems to be a generic difficulty of the models. Although the sub-Chandrasekhar models have a significant helium abundance (unlike Chandrasekhar-mass models), helium lines are not prominent in the spectra near maximum light and thus do not act as a spectral signature for the progenitor.
引用
收藏
页码:812 / 819
页数:8
相关论文
共 38 条
[1]   TYPE-I SUPER-NOVAE .1. ANALYTIC SOLUTIONS FOR THE EARLY PART OF THE LIGHT-CURVE [J].
ARNETT, WD .
ASTROPHYSICAL JOURNAL, 1982, 253 (02) :785-797
[2]   HUBBLES CONSTANT AND EXPLODING CARBON OXYGEN WHITE-DWARF MODELS FOR TYPE-I SUPERNOVAE [J].
ARNETT, WD ;
BRANCH, D ;
WHEELER, JC .
NATURE, 1985, 314 (6009) :337-338
[3]   Non-local thermodynamic equilibrium effects in modelling of supernovae near maximum light [J].
Baron, E ;
Hauschildt, PH ;
Nugent, P ;
Branch, D .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1996, 283 (01) :297-315
[4]   IN SEARCH OF THE PROGENITORS OF TYPE IA SUPERNOVAE [J].
BRANCH, D ;
LIVIO, M ;
YUNGELSON, LR ;
BOFFI, FR ;
BARON, E .
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC, 1995, 107 (717) :1019-1029
[5]  
CAPPELLARO E, 1995, IUE ULTRAVIOLET LOW
[6]   THE SUBLUMINOUS, SPECTROSCOPICALLY PECULIAR TYPE IA SUPERNOVA 1991BG IN THE ELLIPTIC GALAXY NGC 4374 [J].
FILIPPENKO, AV ;
RICHMOND, MW ;
BRANCH, D ;
GASKELL, CM ;
HERBST, W ;
FORD, CH ;
TREFFERS, RR ;
MATHESON, T ;
HO, LC ;
DEY, A ;
SARGENT, WLW ;
SMALL, TA ;
VANBREUGEL, WJM .
ASTRONOMICAL JOURNAL, 1992, 104 (04) :1543-1556
[7]   A HUBBLE DIAGRAM OF DISTANT TYPE IA SUPERNOVAE [J].
HAMUY, M ;
PHILLIPS, MM ;
MAZA, J ;
SUNTZEFF, NB ;
SCHOMMER, RA ;
AVILES, R .
ASTRONOMICAL JOURNAL, 1995, 109 (01) :1-13
[8]  
HARKNESS R, 1991, SUPERNOVAE //, P454
[9]  
HARKNESS RP, 1991, P ESO EIPC WORKSHOP, P447
[10]   MULTILEVEL NON-LTE RADIATIVE-TRANSFER IN EXPANDING SHELLS [J].
HAUSCHILDT, PH .
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER, 1993, 50 (03) :301-318