Literatur

Höflich, Joachim R.

doi:10.1007/978-3-322-99336-6_5

Cited by 3 publications

(4 citation statements)

References 225 publications

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“…Even when viewed equator-on, considerable ellipsoidal asymmetry is required to account for SN-like continuum polarization. For example, Monte Carlo calculations suggest that iso-density contour axis ratios of order 1.2:1 and 2.5:1 are needed for polarizations of 1 % and 3 %, respectively [58,130]. Late-time imaging of SN 1987A shows asymmetries suggesting axis ratios of 2:1 [57,131].…”

Section: Asymmetry and Polarization Spectramentioning

confidence: 99%

“…In the well studied SN 1993J, He I lines became conspicuous after maximum brightness, as the hydrogen lines faded. The photospheric and nebular spectra were modeled in detail ( [2,58,60,126] and references therein). More recent work on SN 1993J has concentrated on inferring properties of the clumps and the nature of the CSI directly from line profiles and fluxes [88].…”

Section: Sne IImentioning

confidence: 99%

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Optical Spectra of Supernovae

Branch

Baron

Jeffery

2003

Supernovae and Gamma-Ray Bursters

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Supernova flux and polarization spectra bring vital information on the geometry, physical conditions, and composition structure of the ejected matter. For some supernovae the circumstellar matter is also probed by the observed spectra. Some of this information can be inferred directly from the observed line profiles and fluxes, but because of the Doppler broadening and severe line blending, interpretation often involves the use of synthetic spectra. The emphasis in this Chapter is on recent results obtained with the help of synthetic spectra.

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Section: Asymmetry and Polarization Spectramentioning

confidence: 99%

Section: Sne IImentioning

confidence: 99%

Optical Spectra of Supernovae

Branch

Baron

Jeffery

2003

Supernovae and Gamma-Ray Bursters

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“…This is an area that has not been studied in great depth, despite its importance. Although some works have addressed the properties of the light curve (LC) or the late phase spectra of aspherical SNe (e.g., Höflich et al 1999;Maeda et al 2002;Maeda et al 2006a, c;Sim 2006), only a few studies of early phase spectra (t ∼ < 50 days, where t is the time since the explosion) have been performed (e.g., Höflich et al 1996 for core-collapse SNe, Thomas et al 2002;Kasen et al 2004;Tanaka et al 2006 for Type Ia SNe).…”

Section: Introductionmentioning

confidence: 99%

Multidimensional Simulations for Early-Phase Spectra of Aspherical Hypernovae: SN 1998bw and Off-Axis Hypernovae

Tanaka¹,

Maeda²,

Mazzali³

et al. 2007

ApJ

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Early-phase optical spectra of aspherical jet-like supernovae (SNe) are presented. We focus on energetic core-collapse SNe, or hypernovae. Based on hydrodynamic and nucleosynthetic models, radiative transfer in the SN atmosphere is solved with a multidimensional Monte Carlo radiative transfer code, SAMURAI. Since the luminosity is boosted in the jet direction, the temperature there is higher than in the equatorial plane by ∼2000 K. This causes anisotropic ionization in the ejecta. Emergent spectra are different depending on viewing angle, reflecting both aspherical abundance distribution and anisotropic ionization. Spectra computed with an aspherical explosion model with kinetic energy ergs are compatible with those of the Type Ic SN 1998bw if ∼10%-20% of the synthesized metals are 51 20 # 10 mixed out to higher velocities. The simulations enable us to predict the properties of off-axis hypernovae. Even if an aspherical hypernova explosion is observed from the side, it should show hypernova-like spectra but with some differences in the line velocity, the width of the Fe absorptions, and the strength of the Na i line.

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“…^ 100 days [25,26] (see model F50 in the right panel of Fig. This problem can be solved by See also [16,17,18,19,20,21] for other multi-dimensional codes. This problem can be solved by See also [16,17,18,19,20,21] for other multi-dimensional codes.…”

Section: Light Curvesmentioning

confidence: 99%

Multi-Dimensional Simulations of Radiative Transfer in Aspherical Core-Collapse Supernovae

Tanaka¹,

Maeda²,

Mazzali³

et al. 2008

AIP Conference Proceedings

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We study optical radiation of aspherical supernovae (SNe) and present an approach to verify the asphericity of SNe with optical observations of extragalactic SNe. For this purpose, we have developed a multi-dimensional Monte-Carlo radiative transfer code, SAMURAI (SupemovA Multidimensional RAdlative transfer code). The code can compute the optical light curve and spectra both at early phases (< 40 days after the explosion) and late phases (-^ 1 year after the explosion), based on hydrodynamic and nucleosynthetic models. We show that all the optical observations of SN 1998bw (associated with GRB 980425) are consistent with polar-viewed radiation of the aspherical explosion model with kinetic energy 20 x 10^^ ergs. Properties of off-axis hypernovae are also discussed briefly.

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Literatur

Cited by 3 publications

References 225 publications

Optical Spectra of Supernovae

Optical Spectra of Supernovae

Multidimensional Simulations for Early-Phase Spectra of Aspherical Hypernovae: SN 1998bw and Off-Axis Hypernovae

Multi-Dimensional Simulations of Radiative Transfer in Aspherical Core-Collapse Supernovae

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