On the Geometry of the High‐Velocity Ejecta of the Peculiar Type Ia Supernova 2000cx

Thomas, R. C.; Branch, David; Baron, E.; Nomoto, Ken’ichi; Li, Weidong; Filippenko, A. V.

doi:10.1086/380632

Cited by 42 publications

(78 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Following the discovery of HV Ca ii and HV Fe ii in SN 1994D (Hatano et al 1999b), HV Ca ii has been recognized by many authors: see Li et al (2001), Thomas et al (2004), and Branch et al (2004aWang et al (2003), Kasen et al (2003), and Mattila et al (2005) on SN 2001el; Mazzali et al (2005aGerardy et al (2004) and Stanishev et al (2007Quimby et al (2006and Garavini et al (2007) on SN 2005cf. In premaximum spectra of SNe Ia, HV Ca ii is ubiquitous (Mazzali et al 2005b;and this paper), and in Paper II, we regularly invoked HV Ca ii, even at maximum light.…”

Section: Discussionmentioning

confidence: 99%

Comparative Direct Analysis of Type Ia Supernova Spectra. III. Premaximum

Branch¹,

Troxel²,

Jeffery³

et al. 2007

PUBL ASTRON SOC PAC

Self Cite

View full text Add to dashboard Cite

ABSTRACT.A comparative study of spectra of 21 Type Ia supernovae (SNe Ia) obtained about 1 week before maximum light, and 8 spectra obtained 11 or more days before maximum, is presented. To a large extent, the premaximum spectra exhibit the defining characteristics of the four groups defined in Paper II (core normal, broad line, cool, and shallow silicon). Comparisons with SYNOW synthetic spectra show that all strong features and most weak ones can be accounted for in a plausible way. The issues of detached high-velocity features, the possible ubiquity of carbon clumps, the maximum detectable ejecta velocities, and the possibility of blueshifted emission-line peaks are discussed.

show abstract

Section: Discussionmentioning

confidence: 99%

Comparative Direct Analysis of Type Ia Supernova Spectra. III. Premaximum

Branch¹,

Troxel²,

Jeffery³

et al. 2007

PUBL ASTRON SOC PAC

Self Cite

View full text Add to dashboard Cite

show abstract

“…This has in contrast to this paper mainly been in the context of early stages, and at high velocities. In Thomas et al (2004) the high velocity Ca II features seen in SN 2000cx near maximum light are modeled, based on 3D ejecta models. They find that 3D models are required to explain the Ca II features, and they also estimate the mass of the high velocity ejecta.…”

Section: Discussionmentioning

confidence: 99%

Three-dimensional modeling of type Ia supernovae – The power of late time spectra

Kozma¹,

Fransson²,

Hillebrandt

et al. 2005

A&A

110

117

View full text Add to dashboard Cite

Abstract. Late time synthetic spectra of type Ia supernovae, based on three-dimensional deflagration models, are presented. We mainly focus on one model, "c3_3d_256_10s", for which the hydrodynamics (Röpke 2005, A&A, 432, 969) and nucleosynthesis (Travaglio et al. 2004(Travaglio et al. , A&A, 425, 1029 was calculated up to the homologous phase of the explosion. Other models with different ignition conditions and different resolution are also briefly discussed. The synthetic spectra are compared to observed late time spectra. We find that while the model spectra after 300 to 500 days show a good agreement with the observed Fe II-III features, they also show too strong O I and C I lines compared to the observed late time spectra. The oxygen and carbon emission originates from the low-velocity unburned material in the central regions of these models. To get agreement between the models and observations we find that only a small mass of unburned material may be left in the center after the explosion. This may be a problem for pure deflagration models, although improved initial conditions, as well as higher resolution decrease the discrepancy. The relative intensity from the different ionization stages of iron is sensitive to the density of the emitting iron-rich material. We find that clumping, with the presence of low density regions, is needed to reproduce the observed iron emission, especially in the range between 4000 and 6000 Å. Both temperature and ionization depend sensitively on density, abundances and radioactive content. This work therefore illustrates the importance of including the inhomogeneous nature of realistic three-dimensional explosion models. We briefly discuss the implications of the spectral modeling for the nature of the explosion.

show abstract

“…Spectra of the hydrodynamical models were calculated using a multidimensional Monte Carlo radiative transfer code (Thomas 2003;Kasen 2004). The opacities used in the calculation were electron scattering and bound-bound line transitions.…”

Section: Methodsmentioning

confidence: 99%

Spectral Signatures of Gravitationally Confined Thermonuclear Supernova Explosions

Kasen

Plewa

2005

ApJ

View full text Add to dashboard Cite

We consider some of the spectral and polarimetric signatures of the gravitationally confined detonation scenario for Type Ia supernova explosions. In this model, material produced by an off-center deflagration (which itself fails to produce the explosion) forms a metal-rich atmosphere above the white dwarf surface. Using hydrodynamical simulations, we show that this atmosphere is compressed and accelerated during the subsequent interaction with the supernova ejecta. This leads ultimately to the formation of a high-velocity pancake of metal-rich material that is geometrically detached from the bulk of the ejecta. When observed at the epochs near maximum light, this absorbing pancake produces a highly blueshifted and polarized calcium IR triplet absorption feature similar to that observed in several Type Ia supernovae. We discuss the orientation effects present in our model and contrast them to those expected in other supernova explosion models. We propose that a large sample of spectropolarimetric observations can be used to critically evaluate the different theoretical scenarios.

show abstract

On the Geometry of the High‐Velocity Ejecta of the Peculiar Type Ia Supernova 2000cx

Cited by 42 publications

References 30 publications

Comparative Direct Analysis of Type Ia Supernova Spectra. III. Premaximum

Comparative Direct Analysis of Type Ia Supernova Spectra. III. Premaximum

Three-dimensional modeling of type Ia supernovae – The power of late time spectra

Spectral Signatures of Gravitationally Confined Thermonuclear Supernova Explosions

Contact Info

Product

Resources

About