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
Institución: Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador: oai:ri.conicet.gov.ar:11336/211716

Acceder

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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 Técnicas2025-10-22T12:03:51Zoai: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:34982025-10-22 12:03:51.447CONICET 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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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) instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str	CONICET Digital (CONICET)
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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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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...

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