Search for particle acceleration in two massive Wolf–Rayet stars using uGMRT observations

Autores
Saha, Anindya; Tej, Anandmayee; del Palacio, Santiago; De Becker, Michaël; Benaglia, Paula; Ishwara Chandra, C. H.; Prajapati, Prachi
Año de publicación
2023
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Large wind kinetic power of Wolf-Rayet (WR) stars make them ideal targets in low radio frequencies to search for non-thermal emission due to relativistic particle acceleration. In this paper, we present observations of two WR stars, WR 114 and WR 142, in Band 4 (550-950 MHz) and Band 5 (1050-1450 MHz) using the upgraded Giant Meterwave Radio Telescope. Neither star is detected in the observed frequency bands, nor extended emission associated with them. The upper limit to the free-free radio emission from the stellar wind enables us to constrain the mass-loss rate of WR 114 to $lesssim m 10^{-5}, M_{ odot }, yr^{-1}$; this is a factor three smaller than previously estimated using spectroscopic modelling. If we further assume that the WR stars are binaries, the non-detection of synchrotron emission from the putative wind collision region implies that the stars are either in very wide binary systems away from periastron, or that the stars are in close binary systems with an orbital separation <70 AU for WR 114 and <20 AU for WR 142. The non-detection of low-frequency radio emission from these two systems thus provides evidence that narrows their nature, though it does not rule them out as bona fide particle-accelerating colliding-wind binaries.
Fil: Saha, Anindya. Indian Institute Of Space Science And Technology; India
Fil: Tej, Anandmayee. Indian Institute Of Space Science And Technology; India
Fil: del Palacio, Santiago. Chalmers University Of Technology; Suecia
Fil: De Becker, Michaël. Université de Liège; Bélgica
Fil: Benaglia, Paula. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto Argentino de Radioastronomía. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto Argentino de Radioastronomía; Argentina
Fil: Ishwara Chandra, C. H.. International Centre Of Theoretical Science; India
Fil: Prajapati, Prachi. Indian Institute Of Space Science And Technology; India
Materia
RADIATION MECHANISMS: NON THERMAL
RADIATION MECHANISMS: THERMAL
STARS: WOLF RAYET
RADIO CONTINUUM: ISM
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:11336/239846
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/239846
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Search for particle acceleration in two massive Wolf–Rayet stars using uGMRT observationsSaha, AnindyaTej, Anandmayeedel Palacio, SantiagoDe Becker, MichaëlBenaglia, PaulaIshwara Chandra, C. H.Prajapati, PrachiRADIATION MECHANISMS: NON THERMALRADIATION MECHANISMS: THERMALSTARS: WOLF RAYETRADIO CONTINUUM: ISMhttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1Large wind kinetic power of Wolf-Rayet (WR) stars make them ideal targets in low radio frequencies to search for non-thermal emission due to relativistic particle acceleration. In this paper, we present observations of two WR stars, WR 114 and WR 142, in Band 4 (550-950 MHz) and Band 5 (1050-1450 MHz) using the upgraded Giant Meterwave Radio Telescope. Neither star is detected in the observed frequency bands, nor extended emission associated with them. The upper limit to the free-free radio emission from the stellar wind enables us to constrain the mass-loss rate of WR 114 to $lesssim m 10^{-5}, M_{ odot }, yr^{-1}$; this is a factor three smaller than previously estimated using spectroscopic modelling. If we further assume that the WR stars are binaries, the non-detection of synchrotron emission from the putative wind collision region implies that the stars are either in very wide binary systems away from periastron, or that the stars are in close binary systems with an orbital separation <70 AU for WR 114 and <20 AU for WR 142. The non-detection of low-frequency radio emission from these two systems thus provides evidence that narrows their nature, though it does not rule them out as bona fide particle-accelerating colliding-wind binaries.Fil: Saha, Anindya. Indian Institute Of Space Science And Technology; IndiaFil: Tej, Anandmayee. Indian Institute Of Space Science And Technology; IndiaFil: del Palacio, Santiago. Chalmers University Of Technology; SueciaFil: De Becker, Michaël. Université de Liège; BélgicaFil: Benaglia, Paula. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto Argentino de Radioastronomía. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto Argentino de Radioastronomía; ArgentinaFil: Ishwara Chandra, C. H.. International Centre Of Theoretical Science; IndiaFil: Prajapati, Prachi. Indian Institute Of Space Science And Technology; IndiaWiley Blackwell Publishing, Inc2023-11info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/239846Saha, Anindya; Tej, Anandmayee; del Palacio, Santiago; De Becker, Michaël; Benaglia, Paula; et al.; Search for particle acceleration in two massive Wolf–Rayet stars using uGMRT observations; Wiley Blackwell Publishing, Inc; Monthly Notices of the Royal Astronomical Society; 526; 1; 11-2023; 750-7570035-8711CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://academic.oup.com/mnras/article/526/1/750/7271815info:eu-repo/semantics/altIdentifier/doi/10.1093/mnras/stad2758info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T09:36:16Zoai:ri.conicet.gov.ar:11336/239846instacron: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 09:36:16.801CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Search for particle acceleration in two massive Wolf–Rayet stars using uGMRT observations
title Search for particle acceleration in two massive Wolf–Rayet stars using uGMRT observations
spellingShingle Search for particle acceleration in two massive Wolf–Rayet stars using uGMRT observations
Saha, Anindya
RADIATION MECHANISMS: NON THERMAL
RADIATION MECHANISMS: THERMAL
STARS: WOLF RAYET
RADIO CONTINUUM: ISM
title_short Search for particle acceleration in two massive Wolf–Rayet stars using uGMRT observations
title_full Search for particle acceleration in two massive Wolf–Rayet stars using uGMRT observations
title_fullStr Search for particle acceleration in two massive Wolf–Rayet stars using uGMRT observations
title_full_unstemmed Search for particle acceleration in two massive Wolf–Rayet stars using uGMRT observations
title_sort Search for particle acceleration in two massive Wolf–Rayet stars using uGMRT observations
dc.creator.none.fl_str_mv Saha, Anindya
Tej, Anandmayee
del Palacio, Santiago
De Becker, Michaël
Benaglia, Paula
Ishwara Chandra, C. H.
Prajapati, Prachi
author Saha, Anindya
author_facet Saha, Anindya
Tej, Anandmayee
del Palacio, Santiago
De Becker, Michaël
Benaglia, Paula
Ishwara Chandra, C. H.
Prajapati, Prachi
author_role author
author2 Tej, Anandmayee
del Palacio, Santiago
De Becker, Michaël
Benaglia, Paula
Ishwara Chandra, C. H.
Prajapati, Prachi
author2_role author
author
author
author
author
author
dc.subject.none.fl_str_mv RADIATION MECHANISMS: NON THERMAL
RADIATION MECHANISMS: THERMAL
STARS: WOLF RAYET
RADIO CONTINUUM: ISM
topic RADIATION MECHANISMS: NON THERMAL
RADIATION MECHANISMS: THERMAL
STARS: WOLF RAYET
RADIO CONTINUUM: ISM
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Large wind kinetic power of Wolf-Rayet (WR) stars make them ideal targets in low radio frequencies to search for non-thermal emission due to relativistic particle acceleration. In this paper, we present observations of two WR stars, WR 114 and WR 142, in Band 4 (550-950 MHz) and Band 5 (1050-1450 MHz) using the upgraded Giant Meterwave Radio Telescope. Neither star is detected in the observed frequency bands, nor extended emission associated with them. The upper limit to the free-free radio emission from the stellar wind enables us to constrain the mass-loss rate of WR 114 to $lesssim m 10^{-5}, M_{ odot }, yr^{-1}$; this is a factor three smaller than previously estimated using spectroscopic modelling. If we further assume that the WR stars are binaries, the non-detection of synchrotron emission from the putative wind collision region implies that the stars are either in very wide binary systems away from periastron, or that the stars are in close binary systems with an orbital separation <70 AU for WR 114 and <20 AU for WR 142. The non-detection of low-frequency radio emission from these two systems thus provides evidence that narrows their nature, though it does not rule them out as bona fide particle-accelerating colliding-wind binaries.
Fil: Saha, Anindya. Indian Institute Of Space Science And Technology; India
Fil: Tej, Anandmayee. Indian Institute Of Space Science And Technology; India
Fil: del Palacio, Santiago. Chalmers University Of Technology; Suecia
Fil: De Becker, Michaël. Université de Liège; Bélgica
Fil: Benaglia, Paula. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto Argentino de Radioastronomía. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto Argentino de Radioastronomía; Argentina
Fil: Ishwara Chandra, C. H.. International Centre Of Theoretical Science; India
Fil: Prajapati, Prachi. Indian Institute Of Space Science And Technology; India
description Large wind kinetic power of Wolf-Rayet (WR) stars make them ideal targets in low radio frequencies to search for non-thermal emission due to relativistic particle acceleration. In this paper, we present observations of two WR stars, WR 114 and WR 142, in Band 4 (550-950 MHz) and Band 5 (1050-1450 MHz) using the upgraded Giant Meterwave Radio Telescope. Neither star is detected in the observed frequency bands, nor extended emission associated with them. The upper limit to the free-free radio emission from the stellar wind enables us to constrain the mass-loss rate of WR 114 to $lesssim m 10^{-5}, M_{ odot }, yr^{-1}$; this is a factor three smaller than previously estimated using spectroscopic modelling. If we further assume that the WR stars are binaries, the non-detection of synchrotron emission from the putative wind collision region implies that the stars are either in very wide binary systems away from periastron, or that the stars are in close binary systems with an orbital separation <70 AU for WR 114 and <20 AU for WR 142. The non-detection of low-frequency radio emission from these two systems thus provides evidence that narrows their nature, though it does not rule them out as bona fide particle-accelerating colliding-wind binaries.
publishDate 2023
dc.date.none.fl_str_mv 2023-11
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/11336/239846
Saha, Anindya; Tej, Anandmayee; del Palacio, Santiago; De Becker, Michaël; Benaglia, Paula; et al.; Search for particle acceleration in two massive Wolf–Rayet stars using uGMRT observations; Wiley Blackwell Publishing, Inc; Monthly Notices of the Royal Astronomical Society; 526; 1; 11-2023; 750-757
0035-8711
CONICET Digital
CONICET
url http://hdl.handle.net/11336/239846
identifier_str_mv Saha, Anindya; Tej, Anandmayee; del Palacio, Santiago; De Becker, Michaël; Benaglia, Paula; et al.; Search for particle acceleration in two massive Wolf–Rayet stars using uGMRT observations; Wiley Blackwell Publishing, Inc; Monthly Notices of the Royal Astronomical Society; 526; 1; 11-2023; 750-757
0035-8711
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://academic.oup.com/mnras/article/526/1/750/7271815
info:eu-repo/semantics/altIdentifier/doi/10.1093/mnras/stad2758
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/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv Wiley Blackwell Publishing, Inc
publisher.none.fl_str_mv Wiley Blackwell Publishing, Inc
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
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score 13.070432

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