MULTILAYERED SPECTRAL FORMATION IN TYPE Ia SUPENOVAE AROUND MAXIMUM LIGHT

被引:24
作者
Bongard, Sebastien [1 ,2 ,3 ]
Baron, E. [2 ,4 ]
Smadja, G. [3 ]
Branch, David [2 ]
Hauschildt, Peter H. [5 ]
机构
[1] Lawrence Berkeley Natl Lab, Div Phys, Berkeley, CA 94720 USA
[2] Univ Oklahoma, Homer L Dodge Dept Phys & Astron, Norman, OK 73019 USA
[3] Univ Lyon 1, Inst Phys Nucl Lyon, F-69622 Villeurbanne, France
[4] Lawrence Berkeley Natl Lab, Computat Res Div, Berkeley, CA 94720 USA
[5] Hamburger Sternwarte, D-21029 Hamburg, Germany
关键词
cosmology: miscellaneous; stars: atmospheres; supernovae: general;
D O I
10.1086/590107
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We use the radiative transfer code PHOENIX to study the line formation of the wavelength region 5000-7000 angstrom. This is the region where the SN IaYdefining Si II feature occurs. This region is important, since the ratio of the two nearby silicon lines has been shown to correlate with the absolute blue magnitude. We use a grid of LTE synthetic spectral models to investigate the formation of line features in the spectra of SNe Ia. By isolating the main contributors to the spectral formation, we show that the ions that drive the spectral ratio are Fe III, Fe II, Si II, and S II. While the former two strongly dominate the flux transfer, the latter two form in the same physical region inside the supernova. We also show that the naive blackbody that one would derive from a fit to the observed spectrum is very different than the true underlying continuum.
引用
收藏
页码:456 / 465
页数:10
相关论文
共 22 条
[1]   Spectral modeling of SNe Ia near maximum light: Probing the characteristics of hydrodynamical models [J].
Baron, E. ;
Bongard, Sebastien ;
Branch, David ;
Hauschildt, Peter H. .
ASTROPHYSICAL JOURNAL, 2006, 645 (01) :480-487
[2]   Parallel implementation of the phoenix generalized stellar atmosphere program. II. Wavelength parallelization [J].
Baron, E ;
Hauschildt, PH .
ASTROPHYSICAL JOURNAL, 1998, 495 (01) :370-376
[3]  
Baron E, 1999, ASTROPHYS J, V527, P739, DOI 10.1086/308107
[4]   The diversity of type Ia supernovae: Evidence for systematics? [J].
Benetti, S ;
Cappellaro, E ;
Mazzali, PA ;
Turatto, M ;
Altavilla, G ;
Bufano, F ;
Elias-Rosa, N ;
Kotak, R ;
Pignata, G ;
Salvo, M ;
Stanishev, V .
ASTROPHYSICAL JOURNAL, 2005, 623 (02) :1011-1016
[5]   Type Ia supernova spectral line ratios as luminosity indicators [J].
Bongard, Sebastien ;
Baron, E. ;
Smadja, G. ;
Branch, David ;
Hauschildt, Peter H. .
ASTROPHYSICAL JOURNAL, 2006, 647 (01) :513-524
[6]   Comparative direct analysis of type Ia supernova spectra. II. Maximum light [J].
Branch, D ;
Dang, LC ;
Hall, N ;
Ketchum, W ;
Melakayil, M ;
Parrent, J ;
Troxel, MA ;
Casebeer, D ;
Jeffery, DJ ;
Baron, E .
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC, 2006, 118 (842) :560-571
[7]   Comparative direct analysis of Type Ia supernova spectra. I. SN 1994D [J].
Branch, D ;
Baron, E ;
Hall, N ;
Melakayil, M ;
Parrent, J .
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC, 2005, 117 (832) :545-552
[8]  
Fisher A., 2000, THESIS U OKLAHOMA
[9]   The luminosity of SN 1999by in NGC 2841 and the nature of "peculiar" Type Ia supernovae [J].
Garnavich, PM ;
Bonanos, AZ ;
Krisciunas, K ;
Jha, S ;
Kirshner, RP ;
Schlegel, EM ;
Challis, P ;
Macri, LM ;
Hatano, K ;
Branch, D ;
Bothun, GD ;
Freedman, WL .
ASTROPHYSICAL JOURNAL, 2004, 613 (02) :1120-1132
[10]   Exploring the spectroscopic diversity of Type Ia supernovae [J].
Hachinger, S. ;
Mazzali, P. A. ;
Benetti, S. .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2006, 370 (01) :299-318