Revisiting the axion bounds from the Galactic white dwarf luminosity function

It has been shown that the shape of the luminosity function of white dwarfs (WDLF) is a powerful tool to check for the possible existence of DFSZ-axions, a proposed but not yet detected type of weakly interacting particles. With the aim of deriving new constraints on the axion mass, we compute in th...

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Autores principales: Miller Bertolami, Marcelo Miguel, Melendez, Brenda Eliana, Althaus, Leandro Gabriel, Isern, J.
Formato: Articulo
Lenguaje:Inglés
Publicado: 2014
Materias:
Ciencias Astronómicas
Axions
Dark matter detectors
Stars
White and brown dwarfs
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/85024
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-85024
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
Axions
Dark matter detectors
Stars
White and brown dwarfs
spellingShingle Ciencias Astronómicas
Axions
Dark matter detectors
Stars
White and brown dwarfs
Miller Bertolami, Marcelo Miguel
Melendez, Brenda Eliana
Althaus, Leandro Gabriel
Isern, J.
Revisiting the axion bounds from the Galactic white dwarf luminosity function
topic_facet Ciencias Astronómicas
Axions
Dark matter detectors
Stars
White and brown dwarfs
description It has been shown that the shape of the luminosity function of white dwarfs (WDLF) is a powerful tool to check for the possible existence of DFSZ-axions, a proposed but not yet detected type of weakly interacting particles. With the aim of deriving new constraints on the axion mass, we compute in this paper new theoretical WDLFs on the basis of WD evolving models that incorporate the feedback of axions on the thermal structure of the white dwarf. We find that the impact of the axion emission into the neutrino emission can not be neglected at high luminosities M<sub>Bol</sub> ≲ 8 ) and that the axion emission needs to be incorporated self-consistently into the evolution of the white dwarfs when dealing with axion masses larger than m<sub>a</sub> cos<sup>2</sup>β ≳5 meV (i.e. axion-electron coupling constant g<sub>ae</sub> 1.4× 10<sup>-13</sup>). We went beyond previous works by including 5 different derivations of the WDLF in our analysis. Then we have performed χ2-tests to have a quantitative measure of the agreement between the theoretical WDLFs - computed under the assumptions of different axion masses and normalization methods - - and the observed WDLFs of the Galactic disk. While all the WDLF studied in this work disfavour axion masses in the range suggested by asteroseismology m<sub>a</sub> cos<sup>2</sup>β 10 meV; g<sub>ae</sub> 2.8× 10-13) lower axion masses can not be discarded from our current knowledge of the WDLF of the Galactic Disk. A larger set of completely independent derivations of the WDLF of the galactic disk as well as a detailed study of the uncertainties of the theoretical WDLFs is needed before quantitative constraints on the axion-electron coupling constant can be made.
format Articulo
Articulo
author Miller Bertolami, Marcelo Miguel
Melendez, Brenda Eliana
Althaus, Leandro Gabriel
Isern, J.
author_facet Miller Bertolami, Marcelo Miguel
Melendez, Brenda Eliana
Althaus, Leandro Gabriel
Isern, J.
author_sort Miller Bertolami, Marcelo Miguel
title Revisiting the axion bounds from the Galactic white dwarf luminosity function
title_short Revisiting the axion bounds from the Galactic white dwarf luminosity function
title_full Revisiting the axion bounds from the Galactic white dwarf luminosity function
title_fullStr Revisiting the axion bounds from the Galactic white dwarf luminosity function
title_full_unstemmed Revisiting the axion bounds from the Galactic white dwarf luminosity function
title_sort revisiting the axion bounds from the galactic white dwarf luminosity function
publishDate 2014
url http://sedici.unlp.edu.ar/handle/10915/85024
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AT althausleandrogabriel revisitingtheaxionboundsfromthegalacticwhitedwarfluminosityfunction
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bdutipo_str Repositorios
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