The progenitor of the type IIb SN 2008ax revisited

<i>Hubble Space Telescope</i> observations of the site of the supernova (SN) SN 2008ax obtained in 2011 and 2013 reveal that the possible progenitor object detected in pre-explosion images was in fact multiple. Four point sources are resolved in the new, higher-resolution images. We iden...

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Detalles Bibliográficos
Autores principales: Folatelli, Gastón, Bersten, Melina Cecilia, Kuncarayakti, Hanindyo, Benvenuto, Omar Gustavo, Maeda, Keiichi, Nomoto, Ken’ichi
Formato: Articulo
Lenguaje:Inglés
Publicado: 2015
Materias:
Ciencias Astronómicas
supernovae: general
supernovae: individual (SN 2008ax)
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/86363
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-86363
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
supernovae: general
supernovae: individual (SN 2008ax)
spellingShingle Ciencias Astronómicas
supernovae: general
supernovae: individual (SN 2008ax)
Folatelli, Gastón
Bersten, Melina Cecilia
Kuncarayakti, Hanindyo
Benvenuto, Omar Gustavo
Maeda, Keiichi
Nomoto, Ken’ichi
The progenitor of the type IIb SN 2008ax revisited
topic_facet Ciencias Astronómicas
supernovae: general
supernovae: individual (SN 2008ax)
description <i>Hubble Space Telescope</i> observations of the site of the supernova (SN) SN 2008ax obtained in 2011 and 2013 reveal that the possible progenitor object detected in pre-explosion images was in fact multiple. Four point sources are resolved in the new, higher-resolution images. We identify one of the sources with the fading SN. The other three objects are consistent with single supergiant stars. We conclude that their light contaminated the previously identified progenitor candidate. After subtraction of these stars, the progenitor appears to be significantly fainter and bluer than previously measured. Post-explosion photometry at the SN location indicates that the progenitor object has disappeared. If single, the progenitor is compatible with a supergiant star of B to mid-A spectral type, while a Wolf-Rayet (W-R) star would be too luminous in the ultraviolet to account for the observations. Moreover, our hydrodynamical modeling shows that the pre-explosion mass was 4-5 M⊙ and the radius was 30-50 R⊙, which is incompatible with a W-R progenitor. We present a possible interacting binary progenitor computed with our evolutionary models that reproduces all the observational evidence. A companion star as luminous as an O9-B0 main-sequence star may have remained after the explosion.
format Articulo
Articulo
author Folatelli, Gastón
Bersten, Melina Cecilia
Kuncarayakti, Hanindyo
Benvenuto, Omar Gustavo
Maeda, Keiichi
Nomoto, Ken’ichi
author_facet Folatelli, Gastón
Bersten, Melina Cecilia
Kuncarayakti, Hanindyo
Benvenuto, Omar Gustavo
Maeda, Keiichi
Nomoto, Ken’ichi
author_sort Folatelli, Gastón
title The progenitor of the type IIb SN 2008ax revisited
title_short The progenitor of the type IIb SN 2008ax revisited
title_full The progenitor of the type IIb SN 2008ax revisited
title_fullStr The progenitor of the type IIb SN 2008ax revisited
title_full_unstemmed The progenitor of the type IIb SN 2008ax revisited
title_sort progenitor of the type iib sn 2008ax revisited
publishDate 2015
url http://sedici.unlp.edu.ar/handle/10915/86363
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bdutipo_str Repositorios
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