A Second Candidate Magnetic Helium Core White Dwarf and 3 Other Variable White Dwarfs in the Globular Cluster NGC 6397

Autores
Pichardo Marcano, Manuel; Rivera Sandoval, Liliana E.; Maccarone, Thomas J.; Rohrmann, Rene Daniel; Althaus, Leandro Gabriel; Heinke, Craig O.; Belloni, Diogo; Bahramian, Arash
Año de publicación
2025
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Using archival Hubble Space Telescope observations, we report the discovery of four variable low-mass white dwarfs (WDs; 0.18 M⊙ ≤ M ≤ 0.5 M⊙) in the globular cluster NGC 6397. One source exhibits a periodic optical modulation of 5.21 ± 0.02 hr, which we interpret as potentially due to the rotation of a magnetic helium core WD (He WD). This makes this candidate the second magnetic He WD in NGC 6397, and one of the few He WDs with a measured rotation period. The other three candidates show aperiodic variability, with a change in magnitude ranging from ∼0.11 to 0.6. These discoveries highlight the importance of high-cadence photometric surveys in dense stellar environments. Follow-up spectroscopic observations are needed to confirm the nature of the variability of these systems.
Fil: Pichardo Marcano, Manuel. University of Texas at Austin; Estados Unidos
Fil: Rivera Sandoval, Liliana E.. University of Texas at Austin; Estados Unidos
Fil: Maccarone, Thomas J.. University of Texas at Austin; Estados Unidos
Fil: Rohrmann, Rene Daniel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Juan. Instituto de Ciencias Astronómicas, de la Tierra y del Espacio. Universidad Nacional de San Juan. Instituto de Ciencias Astronómicas, de la Tierra y del Espacio; Argentina
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: Heinke, Craig O.. University of Texas at Austin; Estados Unidos
Fil: Belloni, Diogo. University of Texas at Austin; Estados Unidos
Fil: Bahramian, Arash. University of Texas at Austin; Estados Unidos
Materia
white dwarf
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/290791
Acceder
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network_name_str CONICET Digital (CONICET)
spelling A Second Candidate Magnetic Helium Core White Dwarf and 3 Other Variable White Dwarfs in the Globular Cluster NGC 6397Pichardo Marcano, ManuelRivera Sandoval, Liliana E.Maccarone, Thomas J.Rohrmann, Rene DanielAlthaus, Leandro GabrielHeinke, Craig O.Belloni, DiogoBahramian, Arashwhite dwarfhttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1Using archival Hubble Space Telescope observations, we report the discovery of four variable low-mass white dwarfs (WDs; 0.18 M⊙ ≤ M ≤ 0.5 M⊙) in the globular cluster NGC 6397. One source exhibits a periodic optical modulation of 5.21 ± 0.02 hr, which we interpret as potentially due to the rotation of a magnetic helium core WD (He WD). This makes this candidate the second magnetic He WD in NGC 6397, and one of the few He WDs with a measured rotation period. The other three candidates show aperiodic variability, with a change in magnitude ranging from ∼0.11 to 0.6. These discoveries highlight the importance of high-cadence photometric surveys in dense stellar environments. Follow-up spectroscopic observations are needed to confirm the nature of the variability of these systems.Fil: Pichardo Marcano, Manuel. University of Texas at Austin; Estados UnidosFil: Rivera Sandoval, Liliana E.. University of Texas at Austin; Estados UnidosFil: Maccarone, Thomas J.. University of Texas at Austin; Estados UnidosFil: Rohrmann, Rene Daniel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Juan. Instituto de Ciencias Astronómicas, de la Tierra y del Espacio. Universidad Nacional de San Juan. Instituto de Ciencias Astronómicas, de la Tierra y del Espacio; ArgentinaFil: 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: Heinke, Craig O.. University of Texas at Austin; Estados UnidosFil: Belloni, Diogo. University of Texas at Austin; Estados UnidosFil: Bahramian, Arash. University of Texas at Austin; Estados UnidosIOP Publishing2025-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/290791Pichardo Marcano, Manuel; Rivera Sandoval, Liliana E.; Maccarone, Thomas J.; Rohrmann, Rene Daniel; Althaus, Leandro Gabriel; et al.; A Second Candidate Magnetic Helium Core White Dwarf and 3 Other Variable White Dwarfs in the Globular Cluster NGC 6397; IOP Publishing; Astrophysical Journal; 979; 2; 1-2025; 1-100004-637XCONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://iopscience.iop.org/article/10.3847/1538-4357/ada144info:eu-repo/semantics/altIdentifier/doi/10.3847/1538-4357/ada144info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2026-08-25T15:45:15Zoai:ri.conicet.gov.ar:11336/290791instacron: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:34982026-08-25 15:45:16.577CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv A Second Candidate Magnetic Helium Core White Dwarf and 3 Other Variable White Dwarfs in the Globular Cluster NGC 6397
title A Second Candidate Magnetic Helium Core White Dwarf and 3 Other Variable White Dwarfs in the Globular Cluster NGC 6397
spellingShingle A Second Candidate Magnetic Helium Core White Dwarf and 3 Other Variable White Dwarfs in the Globular Cluster NGC 6397
Pichardo Marcano, Manuel
white dwarf
title_short A Second Candidate Magnetic Helium Core White Dwarf and 3 Other Variable White Dwarfs in the Globular Cluster NGC 6397
title_full A Second Candidate Magnetic Helium Core White Dwarf and 3 Other Variable White Dwarfs in the Globular Cluster NGC 6397
title_fullStr A Second Candidate Magnetic Helium Core White Dwarf and 3 Other Variable White Dwarfs in the Globular Cluster NGC 6397
title_full_unstemmed A Second Candidate Magnetic Helium Core White Dwarf and 3 Other Variable White Dwarfs in the Globular Cluster NGC 6397
title_sort A Second Candidate Magnetic Helium Core White Dwarf and 3 Other Variable White Dwarfs in the Globular Cluster NGC 6397
dc.creator.none.fl_str_mv Pichardo Marcano, Manuel
Rivera Sandoval, Liliana E.
Maccarone, Thomas J.
Rohrmann, Rene Daniel
Althaus, Leandro Gabriel
Heinke, Craig O.
Belloni, Diogo
Bahramian, Arash
author Pichardo Marcano, Manuel
author_facet Pichardo Marcano, Manuel
Rivera Sandoval, Liliana E.
Maccarone, Thomas J.
Rohrmann, Rene Daniel
Althaus, Leandro Gabriel
Heinke, Craig O.
Belloni, Diogo
Bahramian, Arash
author_role author
author2 Rivera Sandoval, Liliana E.
Maccarone, Thomas J.
Rohrmann, Rene Daniel
Althaus, Leandro Gabriel
Heinke, Craig O.
Belloni, Diogo
Bahramian, Arash
author2_role author
author
author
author
author
author
author
dc.subject.none.fl_str_mv white dwarf
topic white dwarf
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Using archival Hubble Space Telescope observations, we report the discovery of four variable low-mass white dwarfs (WDs; 0.18 M⊙ ≤ M ≤ 0.5 M⊙) in the globular cluster NGC 6397. One source exhibits a periodic optical modulation of 5.21 ± 0.02 hr, which we interpret as potentially due to the rotation of a magnetic helium core WD (He WD). This makes this candidate the second magnetic He WD in NGC 6397, and one of the few He WDs with a measured rotation period. The other three candidates show aperiodic variability, with a change in magnitude ranging from ∼0.11 to 0.6. These discoveries highlight the importance of high-cadence photometric surveys in dense stellar environments. Follow-up spectroscopic observations are needed to confirm the nature of the variability of these systems.
Fil: Pichardo Marcano, Manuel. University of Texas at Austin; Estados Unidos
Fil: Rivera Sandoval, Liliana E.. University of Texas at Austin; Estados Unidos
Fil: Maccarone, Thomas J.. University of Texas at Austin; Estados Unidos
Fil: Rohrmann, Rene Daniel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Juan. Instituto de Ciencias Astronómicas, de la Tierra y del Espacio. Universidad Nacional de San Juan. Instituto de Ciencias Astronómicas, de la Tierra y del Espacio; Argentina
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: Heinke, Craig O.. University of Texas at Austin; Estados Unidos
Fil: Belloni, Diogo. University of Texas at Austin; Estados Unidos
Fil: Bahramian, Arash. University of Texas at Austin; Estados Unidos
description Using archival Hubble Space Telescope observations, we report the discovery of four variable low-mass white dwarfs (WDs; 0.18 M⊙ ≤ M ≤ 0.5 M⊙) in the globular cluster NGC 6397. One source exhibits a periodic optical modulation of 5.21 ± 0.02 hr, which we interpret as potentially due to the rotation of a magnetic helium core WD (He WD). This makes this candidate the second magnetic He WD in NGC 6397, and one of the few He WDs with a measured rotation period. The other three candidates show aperiodic variability, with a change in magnitude ranging from ∼0.11 to 0.6. These discoveries highlight the importance of high-cadence photometric surveys in dense stellar environments. Follow-up spectroscopic observations are needed to confirm the nature of the variability of these systems.
publishDate 2025
dc.date.none.fl_str_mv 2025-01
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/11336/290791
Pichardo Marcano, Manuel; Rivera Sandoval, Liliana E.; Maccarone, Thomas J.; Rohrmann, Rene Daniel; Althaus, Leandro Gabriel; et al.; A Second Candidate Magnetic Helium Core White Dwarf and 3 Other Variable White Dwarfs in the Globular Cluster NGC 6397; IOP Publishing; Astrophysical Journal; 979; 2; 1-2025; 1-10
0004-637X
CONICET Digital
CONICET
url http://hdl.handle.net/11336/290791
identifier_str_mv Pichardo Marcano, Manuel; Rivera Sandoval, Liliana E.; Maccarone, Thomas J.; Rohrmann, Rene Daniel; Althaus, Leandro Gabriel; et al.; A Second Candidate Magnetic Helium Core White Dwarf and 3 Other Variable White Dwarfs in the Globular Cluster NGC 6397; IOP Publishing; Astrophysical Journal; 979; 2; 1-2025; 1-10
0004-637X
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/https://iopscience.iop.org/article/10.3847/1538-4357/ada144
info:eu-repo/semantics/altIdentifier/doi/10.3847/1538-4357/ada144
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv IOP Publishing
publisher.none.fl_str_mv IOP Publishing
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
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
_version_ 1874775752538324992
score 13.265058

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