Detection of RS Oph with LST-1 and modelling of its HE/VHE gamma-ray emission

Context. The recurrent nova RS Ophiuchi (RS Oph) underwent a thermonuclear eruption in August 2021. In this event, RS Oph was detected by the High Energy Stereoscopic System (H.E.S.S.), the Major Atmospheric Gamma Imaging Cherenkov (MAGIC), and the first Large-Sized Telescope (LST-1) of the future C...

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Autores: Peral Gochicoa, Luis del|||0000-0003-2580-5668, Rodríguez Frías, María Dolores|||0000-0002-2550-4462, Lozano Bahilo, José Julio
Tipo de documento: artigo
Data de publicação:2025
País:España
Recursos:Universidad de Alcalá (UAH)
Repositório:e_Buah Biblioteca Digital Universidad de Alcalá
Idioma:inglês
OAI Identifier:oai:ebuah.uah.es:10017/66943
Acesso em linha:http://hdl.handle.net/10017/66943
https://dx.doi.org/10.1051/0004-6361/202452447
Access Level:Acceso aberto
Palavra-chave:Radiation mechanisms: non-thermal
Binaries: close
Binaries: symbiotic
Novae, cataclysmic variables
Stars: individual: RS Ophiuchi
Gamma rays: stars
Física
Physics
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spelling Detection of RS Oph with LST-1 and modelling of its HE/VHE gamma-ray emissionPeral Gochicoa, Luis del|||0000-0003-2580-5668Rodríguez Frías, María Dolores|||0000-0002-2550-4462Lozano Bahilo, José JulioRadiation mechanisms: non-thermalBinaries: closeBinaries: symbioticNovae, cataclysmic variablesStars: individual: RS OphiuchiGamma rays: starsFísicaPhysicsContext. The recurrent nova RS Ophiuchi (RS Oph) underwent a thermonuclear eruption in August 2021. In this event, RS Oph was detected by the High Energy Stereoscopic System (H.E.S.S.), the Major Atmospheric Gamma Imaging Cherenkov (MAGIC), and the first Large-Sized Telescope (LST-1) of the future Cherenkov Telescope Array Observatory (CTAO) at very-high gamma-ray energies above 100 GeV. This means that novae are a new class of very-high-energy (VHE) gamma-ray emitters. Aims. We report the analysis of the RS Oph observations with LST-1. We constrain the particle population that causes the observed emission in hadronic and leptonic scenarios. Additionally, we study the prospects of detecting further novae using LST-1 and the upcoming LST array of CTAO-North. Methods. We conducted target-of-opportunity observations with LST-1 from the first day of this nova event. The data were analysed in the framework of cta-lstchain and Gammapy, the official CTAO-LST reconstruction and analysis packages. One-zone hadronic and leptonic models were considered to model the gamma-ray emission of RS Oph using the spectral information from Fermi-LAT and LST-1, together with public data from the MAGIC and H.E.S.S. telescopes. Results. RS Oph was detected at 6.6 sigma with LST-1 in the first 6.35 hours of observations following the eruption. The hadronic scenario is preferred over the leptonic scenario considering a proton energy spectrum with a power-law model with an exponential cuto ff whose position increases from (0.26 +/- 0.08) TeV on day 1 up to (1.6 +/- 0.6) TeV on day 4 after the eruption. The deep sensitivity and low energy threshold of the LST-1 /LST array will allow us to detect faint novae and increase their discovery rate.EDP Sciences20252025-03-14journal articlehttp://purl.org/coar/resource_type/c_6501NAhttp://purl.org/coar/version/c_be7fb7dd8ff6fe43info:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10017/66943https://dx.doi.org/10.1051/0004-6361/202452447reponame:e_Buah Biblioteca Digital Universidad de Alcaláinstname:Universidad de Alcalá (UAH)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2Attribution 4.0 Internationalhttp://creativecommons.org/licenses/by/4.0/info:eu-repo/semantics/openAccessoai:ebuah.uah.es:10017/669432026-06-18T11:13:07Z
dc.title.none.fl_str_mv Detection of RS Oph with LST-1 and modelling of its HE/VHE gamma-ray emission
title Detection of RS Oph with LST-1 and modelling of its HE/VHE gamma-ray emission
spellingShingle Detection of RS Oph with LST-1 and modelling of its HE/VHE gamma-ray emission
Peral Gochicoa, Luis del|||0000-0003-2580-5668
Radiation mechanisms: non-thermal
Binaries: close
Binaries: symbiotic
Novae, cataclysmic variables
Stars: individual: RS Ophiuchi
Gamma rays: stars
Física
Physics
title_short Detection of RS Oph with LST-1 and modelling of its HE/VHE gamma-ray emission
title_full Detection of RS Oph with LST-1 and modelling of its HE/VHE gamma-ray emission
title_fullStr Detection of RS Oph with LST-1 and modelling of its HE/VHE gamma-ray emission
title_full_unstemmed Detection of RS Oph with LST-1 and modelling of its HE/VHE gamma-ray emission
title_sort Detection of RS Oph with LST-1 and modelling of its HE/VHE gamma-ray emission
dc.creator.none.fl_str_mv Peral Gochicoa, Luis del|||0000-0003-2580-5668
Rodríguez Frías, María Dolores|||0000-0002-2550-4462
Lozano Bahilo, José Julio
author Peral Gochicoa, Luis del|||0000-0003-2580-5668
author_facet Peral Gochicoa, Luis del|||0000-0003-2580-5668
Rodríguez Frías, María Dolores|||0000-0002-2550-4462
Lozano Bahilo, José Julio
author_role author
author2 Rodríguez Frías, María Dolores|||0000-0002-2550-4462
Lozano Bahilo, José Julio
author2_role author
author
dc.subject.none.fl_str_mv Radiation mechanisms: non-thermal
Binaries: close
Binaries: symbiotic
Novae, cataclysmic variables
Stars: individual: RS Ophiuchi
Gamma rays: stars
Física
Physics
topic Radiation mechanisms: non-thermal
Binaries: close
Binaries: symbiotic
Novae, cataclysmic variables
Stars: individual: RS Ophiuchi
Gamma rays: stars
Física
Physics
description Context. The recurrent nova RS Ophiuchi (RS Oph) underwent a thermonuclear eruption in August 2021. In this event, RS Oph was detected by the High Energy Stereoscopic System (H.E.S.S.), the Major Atmospheric Gamma Imaging Cherenkov (MAGIC), and the first Large-Sized Telescope (LST-1) of the future Cherenkov Telescope Array Observatory (CTAO) at very-high gamma-ray energies above 100 GeV. This means that novae are a new class of very-high-energy (VHE) gamma-ray emitters. Aims. We report the analysis of the RS Oph observations with LST-1. We constrain the particle population that causes the observed emission in hadronic and leptonic scenarios. Additionally, we study the prospects of detecting further novae using LST-1 and the upcoming LST array of CTAO-North. Methods. We conducted target-of-opportunity observations with LST-1 from the first day of this nova event. The data were analysed in the framework of cta-lstchain and Gammapy, the official CTAO-LST reconstruction and analysis packages. One-zone hadronic and leptonic models were considered to model the gamma-ray emission of RS Oph using the spectral information from Fermi-LAT and LST-1, together with public data from the MAGIC and H.E.S.S. telescopes. Results. RS Oph was detected at 6.6 sigma with LST-1 in the first 6.35 hours of observations following the eruption. The hadronic scenario is preferred over the leptonic scenario considering a proton energy spectrum with a power-law model with an exponential cuto ff whose position increases from (0.26 +/- 0.08) TeV on day 1 up to (1.6 +/- 0.6) TeV on day 4 after the eruption. The deep sensitivity and low energy threshold of the LST-1 /LST array will allow us to detect faint novae and increase their discovery rate.
publishDate 2025
dc.date.none.fl_str_mv 2025
2025-03-14
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
NA
http://purl.org/coar/version/c_be7fb7dd8ff6fe43
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10017/66943
https://dx.doi.org/10.1051/0004-6361/202452447
url http://hdl.handle.net/10017/66943
https://dx.doi.org/10.1051/0004-6361/202452447
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
Attribution 4.0 International
http://creativecommons.org/licenses/by/4.0/
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
Attribution 4.0 International
http://creativecommons.org/licenses/by/4.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv EDP Sciences
publisher.none.fl_str_mv EDP Sciences
dc.source.none.fl_str_mv reponame:e_Buah Biblioteca Digital Universidad de Alcalá
instname:Universidad de Alcalá (UAH)
instname_str Universidad de Alcalá (UAH)
reponame_str e_Buah Biblioteca Digital Universidad de Alcalá
collection e_Buah Biblioteca Digital Universidad de Alcalá
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,812455

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