Is the central binary system of the planetary nebula Henize 2-428 a type Ia supernova progenitor?

We critically discuss the recent observations of the binary system atthe center of the bipolar planetary nebula Henize 2-428. We findthat the proposed explanation of two equal-mass degenerate objects witha total mass larger than the Chandrasekhar limiting mass that supposedlywill merge in less than...

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Detalles Bibliográficos
Autores principales: García Berro, Enrique, Soker, Noam, Althaus, Leandro Gabriel, Ribas, Ignasi, Morales, Juan C.
Formato: Articulo Preprint
Lenguaje:Inglés
Publicado: 2016
Materias:
Ciencias Astronómicas
Planetary nebulae
AGB stars
Supernovae
White dwarfs
post-AGB stars
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/93538
https://www.sciencedirect.com/science/article/abs/pii/S138410761500130X?via%3Dihub
https://ui.adsabs.harvard.edu/abs/2016NewA...45....7G/abstract
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-93538
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
Planetary nebulae
AGB stars
Supernovae
White dwarfs
post-AGB stars
spellingShingle Ciencias Astronómicas
Planetary nebulae
AGB stars
Supernovae
White dwarfs
post-AGB stars
García Berro, Enrique
Soker, Noam
Althaus, Leandro Gabriel
Ribas, Ignasi
Morales, Juan C.
Is the central binary system of the planetary nebula Henize 2-428 a type Ia supernova progenitor?
topic_facet Ciencias Astronómicas
Planetary nebulae
AGB stars
Supernovae
White dwarfs
post-AGB stars
description We critically discuss the recent observations of the binary system atthe center of the bipolar planetary nebula Henize 2-428. We findthat the proposed explanation of two equal-mass degenerate objects witha total mass larger than the Chandrasekhar limiting mass that supposedlywill merge in less than a Hubble time, possibly leading to a SN Ia,is controversial. This hypothesis relies on the assumption that thevariability of the He II 5412 Å spectral lineis due to two absorption components. Instead, we propose that it can beaccounted for by a broad absorption line from the central system on topof which there is a narrow emission line from the nebula. This promptedus to study if the binary system can be made of a degenerate star and alow-mass main sequence companion, or of two degenerate objects ofsmaller mass. We find that although both scenarios can account for theexistence of two symmetric broad minima in the light curve, the secondone agrees better with observations. We thus argue that the claim thatHenize 2-428 provides observational evidence supporting thedouble-degenerate scenario for SN Ia is premature.
format Articulo
Preprint
author García Berro, Enrique
Soker, Noam
Althaus, Leandro Gabriel
Ribas, Ignasi
Morales, Juan C.
author_facet García Berro, Enrique
Soker, Noam
Althaus, Leandro Gabriel
Ribas, Ignasi
Morales, Juan C.
author_sort García Berro, Enrique
title Is the central binary system of the planetary nebula Henize 2-428 a type Ia supernova progenitor?
title_short Is the central binary system of the planetary nebula Henize 2-428 a type Ia supernova progenitor?
title_full Is the central binary system of the planetary nebula Henize 2-428 a type Ia supernova progenitor?
title_fullStr Is the central binary system of the planetary nebula Henize 2-428 a type Ia supernova progenitor?
title_full_unstemmed Is the central binary system of the planetary nebula Henize 2-428 a type Ia supernova progenitor?
title_sort is the central binary system of the planetary nebula henize 2-428 a type ia supernova progenitor?
publishDate 2016
url http://sedici.unlp.edu.ar/handle/10915/93538
https://www.sciencedirect.com/science/article/abs/pii/S138410761500130X?via%3Dihub
https://ui.adsabs.harvard.edu/abs/2016NewA...45....7G/abstract
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