Early ultraviolet/optical emission of the type Ib SN 2008D

We propose an alternative explanation for the post-breakout emission of SN 2008D associated with the X-ray transient 080109. Observations of this object show a very small contrast of 0.35 dex between the light-curve minimum occurring soon after the breakout, and the main luminosity peak which is due...

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Detalles Bibliográficos
Autores principales: Bersten, Melina Cecilia, Tanaka, Masaomi, Tominaga, Nozomu, Benvenuto, Omar Gustavo, Nomoto, Ken’ichi
Formato: Articulo
Lenguaje:Inglés
Publicado: 2013
Materias:
Ciencias Astronómicas
hydrodynamics
supernovae: general
supernovae: individual (SN 2008D)
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/85483
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-85483
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Astronómicas
hydrodynamics
supernovae: general
supernovae: individual (SN 2008D)
spellingShingle Ciencias Astronómicas
hydrodynamics
supernovae: general
supernovae: individual (SN 2008D)
Bersten, Melina Cecilia
Tanaka, Masaomi
Tominaga, Nozomu
Benvenuto, Omar Gustavo
Nomoto, Ken’ichi
Early ultraviolet/optical emission of the type Ib SN 2008D
topic_facet Ciencias Astronómicas
hydrodynamics
supernovae: general
supernovae: individual (SN 2008D)
description We propose an alternative explanation for the post-breakout emission of SN 2008D associated with the X-ray transient 080109. Observations of this object show a very small contrast of 0.35 dex between the light-curve minimum occurring soon after the breakout, and the main luminosity peak which is due to radioactive heating of the ejecta. Hydrodynamical models show that the cooling of a shocked Wolf-Rayet star leads to a much greater difference (≳ 0.9 dex). Our proposed scenario is that of a jet produced during the explosion which deposits 56Ni-rich material in the outer layers of the ejecta. The presence of high-velocity radioactive material allows us to reproduce the complete luminosity evolution of the object. Without outer 56Ni it could be possible to reproduce the early emission purely from cooling of the shocked envelope by assuming a larger progenitor than a Wolf-Rayet star, but that would require an initial density structure significantly different from what is predicted by stellar evolution models. Analytic models of the cooling phase have been proposed reproduce the early emission of SN 2008D with an extended progenitor. However, we found that the models are valid only until 1.5 days after the explosion where only two data of SN 2008D are available. We also discuss the possibility of the interaction of the ejecta with a binary companion, based on published analytic expressions. However, the binary separation required to fit the early emission should be ≲ 3 R ⊙, which is too small for a system containing two massive stars.
format Articulo
Articulo
author Bersten, Melina Cecilia
Tanaka, Masaomi
Tominaga, Nozomu
Benvenuto, Omar Gustavo
Nomoto, Ken’ichi
author_facet Bersten, Melina Cecilia
Tanaka, Masaomi
Tominaga, Nozomu
Benvenuto, Omar Gustavo
Nomoto, Ken’ichi
author_sort Bersten, Melina Cecilia
title Early ultraviolet/optical emission of the type Ib SN 2008D
title_short Early ultraviolet/optical emission of the type Ib SN 2008D
title_full Early ultraviolet/optical emission of the type Ib SN 2008D
title_fullStr Early ultraviolet/optical emission of the type Ib SN 2008D
title_full_unstemmed Early ultraviolet/optical emission of the type Ib SN 2008D
title_sort early ultraviolet/optical emission of the type ib sn 2008d
publishDate 2013
url http://sedici.unlp.edu.ar/handle/10915/85483
work_keys_str_mv AT berstenmelinacecilia earlyultravioletopticalemissionofthetypeibsn2008d
AT tanakamasaomi earlyultravioletopticalemissionofthetypeibsn2008d
AT tominaganozomu earlyultravioletopticalemissionofthetypeibsn2008d
AT benvenutoomargustavo earlyultravioletopticalemissionofthetypeibsn2008d
AT nomotokenichi earlyultravioletopticalemissionofthetypeibsn2008d
bdutipo_str Repositorios
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