PittsburghV1, France, Analysis, bibRecord, 000490

Non-thermal excitation and ionization in supernovae

Identifieur interne : 000490 ( France/Analysis ); précédent : 000489; suivant : 000491

Non-thermal excitation and ionization in supernovae

Auteurs : Chengdong Li ; D. John Hillier [États-Unis] ; Luc Dessart [France]

Source :

Monthly Notices of the Royal Astronomical Society [ 0035-8711 ] ; 2012-10.

RBID : Hal:hal-01442156

Abstract

We incorporate non-thermal excitation and ionization processes arising from non-thermal electrons that result from ?-ray energy deposition into our radiative transfer code cmfgen. The non-thermal electron distribution is obtained by solving the SpencerFano equation using the procedure of Kozma & Fransson. We applied the non-thermal calculations to the blue supergiant explosion model whose early evolution was studied in Dessart & Hillier. Non-thermal processes generally increase excitation and ionization and decrease the temperature of the ejecta. We confirm that non-thermal processes are crucial for modelling nebular spectra. Both optical H?i and He?i lines are significantly strengthened. While optical He?i lines are not easily discerned in observational spectra due to severe blending with other lines, He?i 2.058 mu m provides an excellent opportunity to infer the influence of non-thermal processes. We also discuss the processes controlling the formation of He?i lines during nebular epochs. Most lines of other species are only slightly affected. We also show that the inclusion of Fe?i has substantial line-blanketing effects on optical spectra. Our model spectra and synthetic light curves are compared to the observations of SN 1987A. The spectral evolution shows broad agreement with the observations, especially Ha. The uncertainties of the non-thermal solver are studied, and are expected to be small. With this new addition of non-thermal effects in cmfgen, we now treat all known important processes controlling the radiative transfer of supernova ejecta, whatever the type and the epoch.

Url:

https://hal.archives-ouvertes.fr/hal-01442156

DOI: 10.1111/j.1365-2966.2012.21198.x

Affiliations:

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Hal:hal-01442156

Le document en format XML

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<front><div type="abstract" xml:lang="en">We incorporate non-thermal excitation and ionization processes arising from non-thermal electrons that result from ?-ray energy deposition into our radiative transfer code cmfgen. The non-thermal electron distribution is obtained by solving the SpencerFano equation using the procedure of Kozma & Fransson. We applied the non-thermal calculations to the blue supergiant explosion model whose early evolution was studied in Dessart & Hillier. Non-thermal processes generally increase excitation and ionization and decrease the temperature of the ejecta. We confirm that non-thermal processes are crucial for modelling nebular spectra. Both optical H?i and He?i lines are significantly strengthened. While optical He?i lines are not easily discerned in observational spectra due to severe blending with other lines, He?i 2.058 mu m provides an excellent opportunity to infer the influence of non-thermal processes. We also discuss the processes controlling the formation of He?i lines during nebular epochs. Most lines of other species are only slightly affected. We also show that the inclusion of Fe?i has substantial line-blanketing effects on optical spectra. Our model spectra and synthetic light curves are compared to the observations of SN 1987A. The spectral evolution shows broad agreement with the observations, especially Ha. The uncertainties of the non-thermal solver are studied, and are expected to be small. With this new addition of non-thermal effects in cmfgen, we now treat all known important processes controlling the radiative transfer of supernova ejecta, whatever the type and the epoch.</div>
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Non-thermal excitation and ionization in supernovae

Non-thermal excitation and ionization in supernovae

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Abstract

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