Constraining the neutrino magnetic dipole moment from white dwarf pulsations

Pulsating white dwarf stars can be used as astrophysical laboratories to constrain the properties of weakly interacting particles. Comparing the cooling rates of these stars with the expected values from theoretical models allows us to search for additional sources of cooling due to the emission of...

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Autores principales: Córsico, Alejandro Hugo, Althaus, Leandro Gabriel, Miller Bertolami, Marcelo Miguel, Kepler, Souza Oliveira, García Berro, Enrique
Formato: Articulo
Lenguaje:Inglés
Publicado: 2014
Materias:
Ciencias Astronómicas
Stars: white dwarfs
Dtars: oscillations
Dtars: asteroseismology
Stars: evolution
Astroparticle physics
Neutrinos
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/129672
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-129672
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
Stars: white dwarfs
Dtars: oscillations
Dtars: asteroseismology
Stars: evolution
Astroparticle physics
Neutrinos
spellingShingle Ciencias Astronómicas
Stars: white dwarfs
Dtars: oscillations
Dtars: asteroseismology
Stars: evolution
Astroparticle physics
Neutrinos
Córsico, Alejandro Hugo
Althaus, Leandro Gabriel
Miller Bertolami, Marcelo Miguel
Kepler, Souza Oliveira
García Berro, Enrique
Constraining the neutrino magnetic dipole moment from white dwarf pulsations
topic_facet Ciencias Astronómicas
Stars: white dwarfs
Dtars: oscillations
Dtars: asteroseismology
Stars: evolution
Astroparticle physics
Neutrinos
description Pulsating white dwarf stars can be used as astrophysical laboratories to constrain the properties of weakly interacting particles. Comparing the cooling rates of these stars with the expected values from theoretical models allows us to search for additional sources of cooling due to the emission of axions, neutralinos, or neutrinos with magnetic dipole moment. In this work, we derive an upper bound to the neutrino magnetic dipole moment (µν) using an estimate of the rate of period change of the pulsating DB white dwarf star PG 1351+489. We employ state-of-the-art evolutionary and pulsational codes which allow us to perform a detailed asteroseismological period fit based on fully DB white dwarf evolutionary sequences. Plasmon neutrino emission is the dominant cooling mechanism for this class of hot pulsating white dwarfs, and so it is the main contributor to the rate of change of period with time ((Pi) over dot) for the DBV class. Thus, the inclusion of an anomalous neutrino emission through a non-vanishing magnetic dipole moment in these sequences notably influences the evolutionary timescales, and also the expected pulsational properties of the DBV stars. By comparing the theoretical ((Pi) over dot) value with the rate of change of period with time of PG 1351+489, we assess the possible existence of additional cooling by neutrinos with magnetic dipole moment. Our models suggest the existence of some additional cooling in this pulsating DB white dwarf, consistent with a non-zero magnetic dipole moment with an upper limit of mu(nu) less than or similar to 10(-11) mu(B). This bound is somewhat less restrictive than, but still compatible with, other limits inferred from the white dwarf luminosity function or from the color-magnitude diagram of the Globular cluster M5. Further improvements of the measurement of the rate of period change of the dominant pulsation mode of PG 1351+489 will be necessary to confirm our bound.
format Articulo
Articulo
author Córsico, Alejandro Hugo
Althaus, Leandro Gabriel
Miller Bertolami, Marcelo Miguel
Kepler, Souza Oliveira
García Berro, Enrique
author_facet Córsico, Alejandro Hugo
Althaus, Leandro Gabriel
Miller Bertolami, Marcelo Miguel
Kepler, Souza Oliveira
García Berro, Enrique
author_sort Córsico, Alejandro Hugo
title Constraining the neutrino magnetic dipole moment from white dwarf pulsations
title_short Constraining the neutrino magnetic dipole moment from white dwarf pulsations
title_full Constraining the neutrino magnetic dipole moment from white dwarf pulsations
title_fullStr Constraining the neutrino magnetic dipole moment from white dwarf pulsations
title_full_unstemmed Constraining the neutrino magnetic dipole moment from white dwarf pulsations
title_sort constraining the neutrino magnetic dipole moment from white dwarf pulsations
publishDate 2014
url http://sedici.unlp.edu.ar/handle/10915/129672
work_keys_str_mv AT corsicoalejandrohugo constrainingtheneutrinomagneticdipolemomentfromwhitedwarfpulsations
AT althausleandrogabriel constrainingtheneutrinomagneticdipolemomentfromwhitedwarfpulsations
AT millerbertolamimarcelomiguel constrainingtheneutrinomagneticdipolemomentfromwhitedwarfpulsations
AT keplersouzaoliveira constrainingtheneutrinomagneticdipolemomentfromwhitedwarfpulsations
AT garciaberroenrique constrainingtheneutrinomagneticdipolemomentfromwhitedwarfpulsations
bdutipo_str Repositorios
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