Pulsating hydrogen-deficient white dwarfs and pre-white dwarfs observed with TESS: V. Discovery of two new DBV pulsators, WDJ152738.4-450207.4 and WD 1708-871, and asteroseismology...

Autores
Corsico, Alejandro Hugo; Uzundag, Murat; Kepler, S. O.; Althaus, Leandro Gabriel; Silvotti, R.; Bradley, P.A.; Baran, A.S.; Koester, D.; Bell, K. J.; Romero, A. D.; Hermes, J. J.; Gentile Fusillo, N. P.
Año de publicación
2022
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The TESS space mission has recently demonstrated its great potential to discover new pulsating white dwarf and pre-white dwarf stars, and to detect periodicities with high precision in already known white-dwarf pulsators. Aims. We report the discovery of two new pulsating He-rich atmosphere white dwarfs (DBVs) and present a detailed asteroseismological analysis of three already known DBV stars employing observations collected by the TESS mission along with ground-based data. Methods. We processed and analyzed TESS observations of the three already known DBV stars PG 1351+489 (TIC 471015205), EC 20058−5234 (TIC 101622737), and EC 04207−4748 (TIC 153708460), and the two new DBV pulsators WDJ152738.4−50207.4 (TIC 150808542) and WD 1708−871 (TIC 451533898), whose variability is reported for the first time in this paper. We also carried out a detailed asteroseismological analysis using fully evolutionary DB white-dwarf models built considering the complete evolution of the progenitor stars. We constrained the stellar mass of three of these target stars by means of the observed period spacing, and derived a representative asteroseismological model using the individual periods, when possible. Results. We extracted frequencies from the TESS light curves of these DBV stars using a standard pre-whitening procedure to derive the potential pulsation frequencies. All the oscillation frequencies that we found are associated with g-mode pulsations with periods spanning from ∼190 s to ∼936 s. We find hints of rotation from frequency triplets in some of the targets, including the two new DBVs. For three targets, we find constant period spacings, which allowed us to infer their stellar masses and constrain the harmonic degree ` of the modes. We also performed period-to-period fit analyses and found an asteroseismological model for three targets, with stellar masses generally compatible with the spectroscopic masses. Obtaining seismological models allowed us to estimate the seismological distances and compare them with the precise astrometric distances measured with Gaia. We find a good agreement between the seismic and the astrometric distances for three stars (PG 1351+489, EC 20058-5234, and WD 1708-871); although, for the other two stars (EC 04207-4748 and WD J152738.4-50207), the discrepancies are substantial. Conclusions. The high-quality data from the TESS mission continue to provide important clues which can be used to help determine the internal structure of pulsating pre-white dwarf and white dwarf stars through the tools of asteroseismology.
Fil: Corsico, Alejandro Hugo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; Argentina
Fil: Uzundag, Murat. European Southern Observatory Santiago; Chile. Universidad de Valparaíso; Chile
Fil: Kepler, S. O.. Universidade Federal do Rio Grande do Sul; Brasil
Fil: Althaus, Leandro Gabriel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; Argentina
Fil: Silvotti, R.. Istituto Nazionale di Astrofisica; Italia
Fil: Bradley, P.A.. Los Alamos National Laboratory; Estados Unidos
Fil: Baran, A.S.. Uniwersytet Pedagogiczny; Polonia
Fil: Koester, D.. Christian Albrechts Universitat Zu Kiel; Alemania
Fil: Bell, K. J.. University of Washington; Estados Unidos
Fil: Romero, A. D.. Universidade Federal do Rio Grande do Sul; Brasil
Fil: Hermes, J. J.. Boston University; Estados Unidos
Fil: Gentile Fusillo, N. P.. European Southern Observatory; Chile
Materia
ASTEROSEISMOLOGY
METHODS: OBSERVATIONAL
STARS: EVOLUTION
STARS: INTERIORS
WHITE DWARFS
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/211716

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network_name_str CONICET Digital (CONICET)
spelling Pulsating hydrogen-deficient white dwarfs and pre-white dwarfs observed with TESS: V. Discovery of two new DBV pulsators, WDJ152738.4-450207.4 and WD 1708-871, and asteroseismology of the already known DBV stars PG 1351+489, EC 20058-5234, and EC 04207-4748Corsico, Alejandro HugoUzundag, MuratKepler, S. O.Althaus, Leandro GabrielSilvotti, R.Bradley, P.A.Baran, A.S.Koester, D.Bell, K. J.Romero, A. D.Hermes, J. J.Gentile Fusillo, N. P.ASTEROSEISMOLOGYMETHODS: OBSERVATIONALSTARS: EVOLUTIONSTARS: INTERIORSWHITE DWARFShttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1The TESS space mission has recently demonstrated its great potential to discover new pulsating white dwarf and pre-white dwarf stars, and to detect periodicities with high precision in already known white-dwarf pulsators. Aims. We report the discovery of two new pulsating He-rich atmosphere white dwarfs (DBVs) and present a detailed asteroseismological analysis of three already known DBV stars employing observations collected by the TESS mission along with ground-based data. Methods. We processed and analyzed TESS observations of the three already known DBV stars PG 1351+489 (TIC 471015205), EC 20058−5234 (TIC 101622737), and EC 04207−4748 (TIC 153708460), and the two new DBV pulsators WDJ152738.4−50207.4 (TIC 150808542) and WD 1708−871 (TIC 451533898), whose variability is reported for the first time in this paper. We also carried out a detailed asteroseismological analysis using fully evolutionary DB white-dwarf models built considering the complete evolution of the progenitor stars. We constrained the stellar mass of three of these target stars by means of the observed period spacing, and derived a representative asteroseismological model using the individual periods, when possible. Results. We extracted frequencies from the TESS light curves of these DBV stars using a standard pre-whitening procedure to derive the potential pulsation frequencies. All the oscillation frequencies that we found are associated with g-mode pulsations with periods spanning from ∼190 s to ∼936 s. We find hints of rotation from frequency triplets in some of the targets, including the two new DBVs. For three targets, we find constant period spacings, which allowed us to infer their stellar masses and constrain the harmonic degree ` of the modes. We also performed period-to-period fit analyses and found an asteroseismological model for three targets, with stellar masses generally compatible with the spectroscopic masses. Obtaining seismological models allowed us to estimate the seismological distances and compare them with the precise astrometric distances measured with Gaia. We find a good agreement between the seismic and the astrometric distances for three stars (PG 1351+489, EC 20058-5234, and WD 1708-871); although, for the other two stars (EC 04207-4748 and WD J152738.4-50207), the discrepancies are substantial. Conclusions. The high-quality data from the TESS mission continue to provide important clues which can be used to help determine the internal structure of pulsating pre-white dwarf and white dwarf stars through the tools of asteroseismology.Fil: Corsico, Alejandro Hugo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; ArgentinaFil: Uzundag, Murat. European Southern Observatory Santiago; Chile. Universidad de Valparaíso; ChileFil: Kepler, S. O.. Universidade Federal do Rio Grande do Sul; BrasilFil: Althaus, Leandro Gabriel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; ArgentinaFil: Silvotti, R.. Istituto Nazionale di Astrofisica; ItaliaFil: Bradley, P.A.. Los Alamos National Laboratory; Estados UnidosFil: Baran, A.S.. Uniwersytet Pedagogiczny; PoloniaFil: Koester, D.. Christian Albrechts Universitat Zu Kiel; AlemaniaFil: Bell, K. J.. University of Washington; Estados UnidosFil: Romero, A. D.. Universidade Federal do Rio Grande do Sul; BrasilFil: Hermes, J. J.. Boston University; Estados UnidosFil: Gentile Fusillo, N. P.. European Southern Observatory; ChileEDP Sciences2022-12info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/211716Corsico, Alejandro Hugo; Uzundag, Murat; Kepler, S. O.; Althaus, Leandro Gabriel; Silvotti, R.; et al.; Pulsating hydrogen-deficient white dwarfs and pre-white dwarfs observed with TESS: V. Discovery of two new DBV pulsators, WDJ152738.4-450207.4 and WD 1708-871, and asteroseismology of the already known DBV stars PG 1351+489, EC 20058-5234, and EC 04207-4748; EDP Sciences; Astronomy and Astrophysics; 668; A161; 12-2022; 1-220004-6361CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361/202244198info:eu-repo/semantics/altIdentifier/url/https://www.aanda.org/articles/aa/full_html/2022/12/aa44198-22/aa44198-22.htmlinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:31:25Zoai:ri.conicet.gov.ar:11336/211716instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-29 10:31:25.286CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Pulsating hydrogen-deficient white dwarfs and pre-white dwarfs observed with TESS: V. Discovery of two new DBV pulsators, WDJ152738.4-450207.4 and WD 1708-871, and asteroseismology of the already known DBV stars PG 1351+489, EC 20058-5234, and EC 04207-4748
title Pulsating hydrogen-deficient white dwarfs and pre-white dwarfs observed with TESS: V. Discovery of two new DBV pulsators, WDJ152738.4-450207.4 and WD 1708-871, and asteroseismology of the already known DBV stars PG 1351+489, EC 20058-5234, and EC 04207-4748
spellingShingle Pulsating hydrogen-deficient white dwarfs and pre-white dwarfs observed with TESS: V. Discovery of two new DBV pulsators, WDJ152738.4-450207.4 and WD 1708-871, and asteroseismology of the already known DBV stars PG 1351+489, EC 20058-5234, and EC 04207-4748
Corsico, Alejandro Hugo
ASTEROSEISMOLOGY
METHODS: OBSERVATIONAL
STARS: EVOLUTION
STARS: INTERIORS
WHITE DWARFS
title_short Pulsating hydrogen-deficient white dwarfs and pre-white dwarfs observed with TESS: V. Discovery of two new DBV pulsators, WDJ152738.4-450207.4 and WD 1708-871, and asteroseismology of the already known DBV stars PG 1351+489, EC 20058-5234, and EC 04207-4748
title_full Pulsating hydrogen-deficient white dwarfs and pre-white dwarfs observed with TESS: V. Discovery of two new DBV pulsators, WDJ152738.4-450207.4 and WD 1708-871, and asteroseismology of the already known DBV stars PG 1351+489, EC 20058-5234, and EC 04207-4748
title_fullStr Pulsating hydrogen-deficient white dwarfs and pre-white dwarfs observed with TESS: V. Discovery of two new DBV pulsators, WDJ152738.4-450207.4 and WD 1708-871, and asteroseismology of the already known DBV stars PG 1351+489, EC 20058-5234, and EC 04207-4748
title_full_unstemmed Pulsating hydrogen-deficient white dwarfs and pre-white dwarfs observed with TESS: V. Discovery of two new DBV pulsators, WDJ152738.4-450207.4 and WD 1708-871, and asteroseismology of the already known DBV stars PG 1351+489, EC 20058-5234, and EC 04207-4748
title_sort Pulsating hydrogen-deficient white dwarfs and pre-white dwarfs observed with TESS: V. Discovery of two new DBV pulsators, WDJ152738.4-450207.4 and WD 1708-871, and asteroseismology of the already known DBV stars PG 1351+489, EC 20058-5234, and EC 04207-4748
dc.creator.none.fl_str_mv Corsico, Alejandro Hugo
Uzundag, Murat
Kepler, S. O.
Althaus, Leandro Gabriel
Silvotti, R.
Bradley, P.A.
Baran, A.S.
Koester, D.
Bell, K. J.
Romero, A. D.
Hermes, J. J.
Gentile Fusillo, N. P.
author Corsico, Alejandro Hugo
author_facet Corsico, Alejandro Hugo
Uzundag, Murat
Kepler, S. O.
Althaus, Leandro Gabriel
Silvotti, R.
Bradley, P.A.
Baran, A.S.
Koester, D.
Bell, K. J.
Romero, A. D.
Hermes, J. J.
Gentile Fusillo, N. P.
author_role author
author2 Uzundag, Murat
Kepler, S. O.
Althaus, Leandro Gabriel
Silvotti, R.
Bradley, P.A.
Baran, A.S.
Koester, D.
Bell, K. J.
Romero, A. D.
Hermes, J. J.
Gentile Fusillo, N. P.
author2_role author
author
author
author
author
author
author
author
author
author
author
dc.subject.none.fl_str_mv ASTEROSEISMOLOGY
METHODS: OBSERVATIONAL
STARS: EVOLUTION
STARS: INTERIORS
WHITE DWARFS
topic ASTEROSEISMOLOGY
METHODS: OBSERVATIONAL
STARS: EVOLUTION
STARS: INTERIORS
WHITE DWARFS
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv The TESS space mission has recently demonstrated its great potential to discover new pulsating white dwarf and pre-white dwarf stars, and to detect periodicities with high precision in already known white-dwarf pulsators. Aims. We report the discovery of two new pulsating He-rich atmosphere white dwarfs (DBVs) and present a detailed asteroseismological analysis of three already known DBV stars employing observations collected by the TESS mission along with ground-based data. Methods. We processed and analyzed TESS observations of the three already known DBV stars PG 1351+489 (TIC 471015205), EC 20058−5234 (TIC 101622737), and EC 04207−4748 (TIC 153708460), and the two new DBV pulsators WDJ152738.4−50207.4 (TIC 150808542) and WD 1708−871 (TIC 451533898), whose variability is reported for the first time in this paper. We also carried out a detailed asteroseismological analysis using fully evolutionary DB white-dwarf models built considering the complete evolution of the progenitor stars. We constrained the stellar mass of three of these target stars by means of the observed period spacing, and derived a representative asteroseismological model using the individual periods, when possible. Results. We extracted frequencies from the TESS light curves of these DBV stars using a standard pre-whitening procedure to derive the potential pulsation frequencies. All the oscillation frequencies that we found are associated with g-mode pulsations with periods spanning from ∼190 s to ∼936 s. We find hints of rotation from frequency triplets in some of the targets, including the two new DBVs. For three targets, we find constant period spacings, which allowed us to infer their stellar masses and constrain the harmonic degree ` of the modes. We also performed period-to-period fit analyses and found an asteroseismological model for three targets, with stellar masses generally compatible with the spectroscopic masses. Obtaining seismological models allowed us to estimate the seismological distances and compare them with the precise astrometric distances measured with Gaia. We find a good agreement between the seismic and the astrometric distances for three stars (PG 1351+489, EC 20058-5234, and WD 1708-871); although, for the other two stars (EC 04207-4748 and WD J152738.4-50207), the discrepancies are substantial. Conclusions. The high-quality data from the TESS mission continue to provide important clues which can be used to help determine the internal structure of pulsating pre-white dwarf and white dwarf stars through the tools of asteroseismology.
Fil: Corsico, Alejandro Hugo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; Argentina
Fil: Uzundag, Murat. European Southern Observatory Santiago; Chile. Universidad de Valparaíso; Chile
Fil: Kepler, S. O.. Universidade Federal do Rio Grande do Sul; Brasil
Fil: Althaus, Leandro Gabriel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; Argentina
Fil: Silvotti, R.. Istituto Nazionale di Astrofisica; Italia
Fil: Bradley, P.A.. Los Alamos National Laboratory; Estados Unidos
Fil: Baran, A.S.. Uniwersytet Pedagogiczny; Polonia
Fil: Koester, D.. Christian Albrechts Universitat Zu Kiel; Alemania
Fil: Bell, K. J.. University of Washington; Estados Unidos
Fil: Romero, A. D.. Universidade Federal do Rio Grande do Sul; Brasil
Fil: Hermes, J. J.. Boston University; Estados Unidos
Fil: Gentile Fusillo, N. P.. European Southern Observatory; Chile
description The TESS space mission has recently demonstrated its great potential to discover new pulsating white dwarf and pre-white dwarf stars, and to detect periodicities with high precision in already known white-dwarf pulsators. Aims. We report the discovery of two new pulsating He-rich atmosphere white dwarfs (DBVs) and present a detailed asteroseismological analysis of three already known DBV stars employing observations collected by the TESS mission along with ground-based data. Methods. We processed and analyzed TESS observations of the three already known DBV stars PG 1351+489 (TIC 471015205), EC 20058−5234 (TIC 101622737), and EC 04207−4748 (TIC 153708460), and the two new DBV pulsators WDJ152738.4−50207.4 (TIC 150808542) and WD 1708−871 (TIC 451533898), whose variability is reported for the first time in this paper. We also carried out a detailed asteroseismological analysis using fully evolutionary DB white-dwarf models built considering the complete evolution of the progenitor stars. We constrained the stellar mass of three of these target stars by means of the observed period spacing, and derived a representative asteroseismological model using the individual periods, when possible. Results. We extracted frequencies from the TESS light curves of these DBV stars using a standard pre-whitening procedure to derive the potential pulsation frequencies. All the oscillation frequencies that we found are associated with g-mode pulsations with periods spanning from ∼190 s to ∼936 s. We find hints of rotation from frequency triplets in some of the targets, including the two new DBVs. For three targets, we find constant period spacings, which allowed us to infer their stellar masses and constrain the harmonic degree ` of the modes. We also performed period-to-period fit analyses and found an asteroseismological model for three targets, with stellar masses generally compatible with the spectroscopic masses. Obtaining seismological models allowed us to estimate the seismological distances and compare them with the precise astrometric distances measured with Gaia. We find a good agreement between the seismic and the astrometric distances for three stars (PG 1351+489, EC 20058-5234, and WD 1708-871); although, for the other two stars (EC 04207-4748 and WD J152738.4-50207), the discrepancies are substantial. Conclusions. The high-quality data from the TESS mission continue to provide important clues which can be used to help determine the internal structure of pulsating pre-white dwarf and white dwarf stars through the tools of asteroseismology.
publishDate 2022
dc.date.none.fl_str_mv 2022-12
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/211716
Corsico, Alejandro Hugo; Uzundag, Murat; Kepler, S. O.; Althaus, Leandro Gabriel; Silvotti, R.; et al.; Pulsating hydrogen-deficient white dwarfs and pre-white dwarfs observed with TESS: V. Discovery of two new DBV pulsators, WDJ152738.4-450207.4 and WD 1708-871, and asteroseismology of the already known DBV stars PG 1351+489, EC 20058-5234, and EC 04207-4748; EDP Sciences; Astronomy and Astrophysics; 668; A161; 12-2022; 1-22
0004-6361
CONICET Digital
CONICET
url http://hdl.handle.net/11336/211716
identifier_str_mv Corsico, Alejandro Hugo; Uzundag, Murat; Kepler, S. O.; Althaus, Leandro Gabriel; Silvotti, R.; et al.; Pulsating hydrogen-deficient white dwarfs and pre-white dwarfs observed with TESS: V. Discovery of two new DBV pulsators, WDJ152738.4-450207.4 and WD 1708-871, and asteroseismology of the already known DBV stars PG 1351+489, EC 20058-5234, and EC 04207-4748; EDP Sciences; Astronomy and Astrophysics; 668; A161; 12-2022; 1-22
0004-6361
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361/202244198
info:eu-repo/semantics/altIdentifier/url/https://www.aanda.org/articles/aa/full_html/2022/12/aa44198-22/aa44198-22.html
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
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application/pdf
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dc.publisher.none.fl_str_mv EDP Sciences
publisher.none.fl_str_mv EDP Sciences
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
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reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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