SDSS J001641-000925: The first stable red dwarf contact binary with a close-in stellar companion

Autores
Qian, S. B.; Jiang, L. Q.; Fernández Lajús, Eduardo; Soonthornthum, B.; Zhu, L. Y.; Zhao, E. G.; He, J. J.; Liao, W. P.; Wang, J. J.; Liu, L.; Rattanasoon, S.; Aukkaravittayapun, S.; Zhou, X.; Liu, N. P.
Año de publicación
2015
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
SDSS J001641-000925 is the first red dwarf contact binary star with an orbital period of 0.19856 days that is one of the shortest known periods among M-dwarf binary systems. The orbital period was detected to be decreasing rapidly at a rate of P ∼ 8 s yr-1. This indicated that SDSS J001641-000925 was undergoing coalescence via a dynamical mass transfer or loss and thus this red dwarf contact binary is dynamically unstable. To understand the properties of the period change, we monitored the binary system photometrically from 2011 September 2 to 2014 October 1 by using several telescopes in the world and 25 eclipse times were determined. It is discovered that the rapid decrease of the orbital period is not true. This is contrary to the prediction that the system is merging driven by rapid mass transfer or loss. Our preliminary analysis suggests that the observed minus calculated (O-C) diagram shows a cyclic oscillation with an amplitude of 0.00255 days and a period of 5.7 yr. The cyclic variation can be explained by the light travel time effect via the presence of a cool stellar companion with a mass of M3 sin i′ ∼ 0.14 M⊙. The orbital separation between the third body and the central binary is about 2.8AU. These results reveal that the rarity of red dwarf contact binaries could not be explained by rapidly dynamical destruction and the presence of the third body helps to form the red dwarf contact binary.
Facultad de Ciencias Astronómicas y Geofísicas
Instituto de Astrofísica de La Plata
Materia
Ciencias Astronómicas
binaries: close
binaries: eclipsing
stars: evolution
stars: individual (SDSS J001641-000925)
Nivel de accesibilidad
acceso abierto
Condiciones de uso
http://creativecommons.org/licenses/by-nc-sa/4.0/
Repositorio
SEDICI (UNLP)
Institución
Universidad Nacional de La Plata
OAI Identificador
oai:sedici.unlp.edu.ar:10915/86141

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network_name_str SEDICI (UNLP)
spelling SDSS J001641-000925: The first stable red dwarf contact binary with a close-in stellar companionQian, S. B.Jiang, L. Q.Fernández Lajús, EduardoSoonthornthum, B.Zhu, L. Y.Zhao, E. G.He, J. J.Liao, W. P.Wang, J. J.Liu, L.Rattanasoon, S.Aukkaravittayapun, S.Zhou, X.Liu, N. P.Ciencias Astronómicasbinaries: closebinaries: eclipsingstars: evolutionstars: individual (SDSS J001641-000925)SDSS J001641-000925 is the first red dwarf contact binary star with an orbital period of 0.19856 days that is one of the shortest known periods among M-dwarf binary systems. The orbital period was detected to be decreasing rapidly at a rate of P ∼ 8 s yr<SUP>-1</SUP>. This indicated that SDSS J001641-000925 was undergoing coalescence via a dynamical mass transfer or loss and thus this red dwarf contact binary is dynamically unstable. To understand the properties of the period change, we monitored the binary system photometrically from 2011 September 2 to 2014 October 1 by using several telescopes in the world and 25 eclipse times were determined. It is discovered that the rapid decrease of the orbital period is not true. This is contrary to the prediction that the system is merging driven by rapid mass transfer or loss. Our preliminary analysis suggests that the observed minus calculated (O-C) diagram shows a cyclic oscillation with an amplitude of 0.00255 days and a period of 5.7 yr. The cyclic variation can be explained by the light travel time effect via the presence of a cool stellar companion with a mass of M<SUB>3</SUB> sin i′ ∼ 0.14 M⊙. The orbital separation between the third body and the central binary is about 2.8AU. These results reveal that the rarity of red dwarf contact binaries could not be explained by rapidly dynamical destruction and the presence of the third body helps to form the red dwarf contact binary.Facultad de Ciencias Astronómicas y GeofísicasInstituto de Astrofísica de La Plata2015info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfhttp://sedici.unlp.edu.ar/handle/10915/86141enginfo:eu-repo/semantics/altIdentifier/issn/2041-8205info:eu-repo/semantics/altIdentifier/doi/10.1088/2041-8205/798/2/L42info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-sa/4.0/Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2025-09-29T11:16:59Zoai:sedici.unlp.edu.ar:10915/86141Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-29 11:16:59.342SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv SDSS J001641-000925: The first stable red dwarf contact binary with a close-in stellar companion
title SDSS J001641-000925: The first stable red dwarf contact binary with a close-in stellar companion
spellingShingle SDSS J001641-000925: The first stable red dwarf contact binary with a close-in stellar companion
Qian, S. B.
Ciencias Astronómicas
binaries: close
binaries: eclipsing
stars: evolution
stars: individual (SDSS J001641-000925)
title_short SDSS J001641-000925: The first stable red dwarf contact binary with a close-in stellar companion
title_full SDSS J001641-000925: The first stable red dwarf contact binary with a close-in stellar companion
title_fullStr SDSS J001641-000925: The first stable red dwarf contact binary with a close-in stellar companion
title_full_unstemmed SDSS J001641-000925: The first stable red dwarf contact binary with a close-in stellar companion
title_sort SDSS J001641-000925: The first stable red dwarf contact binary with a close-in stellar companion
dc.creator.none.fl_str_mv Qian, S. B.
Jiang, L. Q.
Fernández Lajús, Eduardo
Soonthornthum, B.
Zhu, L. Y.
Zhao, E. G.
He, J. J.
Liao, W. P.
Wang, J. J.
Liu, L.
Rattanasoon, S.
Aukkaravittayapun, S.
Zhou, X.
Liu, N. P.
author Qian, S. B.
author_facet Qian, S. B.
Jiang, L. Q.
Fernández Lajús, Eduardo
Soonthornthum, B.
Zhu, L. Y.
Zhao, E. G.
He, J. J.
Liao, W. P.
Wang, J. J.
Liu, L.
Rattanasoon, S.
Aukkaravittayapun, S.
Zhou, X.
Liu, N. P.
author_role author
author2 Jiang, L. Q.
Fernández Lajús, Eduardo
Soonthornthum, B.
Zhu, L. Y.
Zhao, E. G.
He, J. J.
Liao, W. P.
Wang, J. J.
Liu, L.
Rattanasoon, S.
Aukkaravittayapun, S.
Zhou, X.
Liu, N. P.
author2_role author
author
author
author
author
author
author
author
author
author
author
author
author
dc.subject.none.fl_str_mv Ciencias Astronómicas
binaries: close
binaries: eclipsing
stars: evolution
stars: individual (SDSS J001641-000925)
topic Ciencias Astronómicas
binaries: close
binaries: eclipsing
stars: evolution
stars: individual (SDSS J001641-000925)
dc.description.none.fl_txt_mv SDSS J001641-000925 is the first red dwarf contact binary star with an orbital period of 0.19856 days that is one of the shortest known periods among M-dwarf binary systems. The orbital period was detected to be decreasing rapidly at a rate of P ∼ 8 s yr<SUP>-1</SUP>. This indicated that SDSS J001641-000925 was undergoing coalescence via a dynamical mass transfer or loss and thus this red dwarf contact binary is dynamically unstable. To understand the properties of the period change, we monitored the binary system photometrically from 2011 September 2 to 2014 October 1 by using several telescopes in the world and 25 eclipse times were determined. It is discovered that the rapid decrease of the orbital period is not true. This is contrary to the prediction that the system is merging driven by rapid mass transfer or loss. Our preliminary analysis suggests that the observed minus calculated (O-C) diagram shows a cyclic oscillation with an amplitude of 0.00255 days and a period of 5.7 yr. The cyclic variation can be explained by the light travel time effect via the presence of a cool stellar companion with a mass of M<SUB>3</SUB> sin i′ ∼ 0.14 M⊙. The orbital separation between the third body and the central binary is about 2.8AU. These results reveal that the rarity of red dwarf contact binaries could not be explained by rapidly dynamical destruction and the presence of the third body helps to form the red dwarf contact binary.
Facultad de Ciencias Astronómicas y Geofísicas
Instituto de Astrofísica de La Plata
description SDSS J001641-000925 is the first red dwarf contact binary star with an orbital period of 0.19856 days that is one of the shortest known periods among M-dwarf binary systems. The orbital period was detected to be decreasing rapidly at a rate of P ∼ 8 s yr<SUP>-1</SUP>. This indicated that SDSS J001641-000925 was undergoing coalescence via a dynamical mass transfer or loss and thus this red dwarf contact binary is dynamically unstable. To understand the properties of the period change, we monitored the binary system photometrically from 2011 September 2 to 2014 October 1 by using several telescopes in the world and 25 eclipse times were determined. It is discovered that the rapid decrease of the orbital period is not true. This is contrary to the prediction that the system is merging driven by rapid mass transfer or loss. Our preliminary analysis suggests that the observed minus calculated (O-C) diagram shows a cyclic oscillation with an amplitude of 0.00255 days and a period of 5.7 yr. The cyclic variation can be explained by the light travel time effect via the presence of a cool stellar companion with a mass of M<SUB>3</SUB> sin i′ ∼ 0.14 M⊙. The orbital separation between the third body and the central binary is about 2.8AU. These results reveal that the rarity of red dwarf contact binaries could not be explained by rapidly dynamical destruction and the presence of the third body helps to form the red dwarf contact binary.
publishDate 2015
dc.date.none.fl_str_mv 2015
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Articulo
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://sedici.unlp.edu.ar/handle/10915/86141
url http://sedici.unlp.edu.ar/handle/10915/86141
dc.language.none.fl_str_mv eng
language eng
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info:eu-repo/semantics/altIdentifier/doi/10.1088/2041-8205/798/2/L42
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-sa/4.0/
Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
eu_rights_str_mv openAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by-nc-sa/4.0/
Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:SEDICI (UNLP)
instname:Universidad Nacional de La Plata
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instname_str Universidad Nacional de La Plata
instacron_str UNLP
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repository.name.fl_str_mv SEDICI (UNLP) - Universidad Nacional de La Plata
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