Spectroscopic characterisation of microlensing events: Towards a new interpretation of OGLE-2011-BLG-0417

Autores: Santerne, A.; Beaulieu, J. P.; Rojas Ayala, B.; Boisse, I.; Schlawin, E.; Almenara, J.-M.; Batista, V.; Bennett, D.; Diaz, Rodrigo Fernando; Figueira, P.; James, D. J.; Herter, T.; Lillo Box, J.; Marquette, J. B.; Ranc, C.; Santos, N. C.; Sousa, S. G.
Año de publicación: 2016
Idioma: inglés
Tipo de recurso: artículo
Estado: versión publicada
Descripción: The microlensing event OGLE-2011-BLG-0417 is an exceptionally bright lens binary that was predicted to present radial velocity variation at the level of several km s-1. Pioneer radial velocity follow-up observations with the UVES spectrograph at the ESO−VLT of this system clearly ruled out the large radial velocity variation, leaving a discrepancy between the observation and the prediction. In this paper, we further characterise the microlensing system by analysing its spectral energy distribution (SED) derived using the UVES spectrum and new observations with the ARCoIRIS (CTIO) near-infrared spectrograph and the Keck adaptive optics instrument NIRC2 in the J, H, and Ks-bands. We determine the mass and distance of the stars independently from the microlensing modelling. We find that the SED is compatible with a giant star in the Galactic bulge and a foreground star with a mass of 0.94 ± 0.09 M⊙ at a distance of 1.07 ± 0.24 kpc. We find that this foreground star is likely the lens. Its parameters are not compatible with the ones previously reported in the literature (0.52 ± 0.04 M⊙ at 0.95 ± 0.06 kpc), based on the microlensing light curve. A thoughtful re-analysis of the microlensing event is mandatory to fully understand the reason of this new discrepancy. More importantly, this paper demonstrates that spectroscopic follow-up observations of microlensing events are possible and provide independent constraints on the parameters of the lens and source stars, hence breaking some degeneracies in the analysis. UV-to-NIR low-resolution spectrographs like X-shooter (ESO−VLT) could substantially contribute to this follow-up efforts, with magnitude limits above all microlensing events detected so far.
Fil: Santerne, A.. Universidade do Porto; Portugal
Fil: Beaulieu, J. P.. Université Pierre & Marie Curie; Francia
Fil: Rojas Ayala, B.. Universidad Andres Bello; Chile
Fil: Boisse, I.. Laboratoire d’Astrophysique de Marseille; Francia
Fil: Schlawin, E.. University Of Arizona; Estados Unidos
Fil: Almenara, J.-M.. Institut de Planétologie et d’Astrophysique de Grenoble; Francia
Fil: Batista, V.. Université Pierre & Marie Curie; Francia
Fil: Bennett, D.. National Aeronautics And Space Administration. Goddart Institute For Space Studies; Estados Unidos
Fil: Diaz, Rodrigo Fernando. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; Argentina
Fil: Figueira, P.. Universidade do Porto; Portugal
Fil: James, D. J.. Cerro Tololo Inter-American Observatory; Chile
Fil: Herter, T.. Cornell University; Estados Unidos
Fil: Lillo Box, J.. European Southern Observatory; Chile
Fil: Marquette, J. B.. Université Pierre & Marie Curie; Francia
Fil: Ranc, C.. Université Pierre & Marie Curi; Francia
Fil: Santos, N. C.. Universidade do Porto; Portugal
Fil: Sousa, S. G.. Universidade do Porto; Portugal
Materia: techniques: spectroscopic
techniques: high angular resolution
stars: individual: OGLE-2011-BLG-0417
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:11336/18441

Acceder

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repository_id_str	3498
network_name_str	CONICET Digital (CONICET)
spelling	Spectroscopic characterisation of microlensing events: Towards a new interpretation of OGLE-2011-BLG-0417Santerne, A.Beaulieu, J. P.Rojas Ayala, B.Boisse, I.Schlawin, E.Almenara, J.-M.Batista, V.Bennett, D.Diaz, Rodrigo FernandoFigueira, P.James, D. J.Herter, T.Lillo Box, J.Marquette, J. B.Ranc, C.Santos, N. C.Sousa, S. G.techniques: spectroscopictechniques: high angular resolutionstars: individual: OGLE-2011-BLG-0417https://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1The microlensing event OGLE-2011-BLG-0417 is an exceptionally bright lens binary that was predicted to present radial velocity variation at the level of several km s-1. Pioneer radial velocity follow-up observations with the UVES spectrograph at the ESO−VLT of this system clearly ruled out the large radial velocity variation, leaving a discrepancy between the observation and the prediction. In this paper, we further characterise the microlensing system by analysing its spectral energy distribution (SED) derived using the UVES spectrum and new observations with the ARCoIRIS (CTIO) near-infrared spectrograph and the Keck adaptive optics instrument NIRC2 in the J, H, and Ks-bands. We determine the mass and distance of the stars independently from the microlensing modelling. We find that the SED is compatible with a giant star in the Galactic bulge and a foreground star with a mass of 0.94 ± 0.09 M⊙ at a distance of 1.07 ± 0.24 kpc. We find that this foreground star is likely the lens. Its parameters are not compatible with the ones previously reported in the literature (0.52 ± 0.04 M⊙ at 0.95 ± 0.06 kpc), based on the microlensing light curve. A thoughtful re-analysis of the microlensing event is mandatory to fully understand the reason of this new discrepancy. More importantly, this paper demonstrates that spectroscopic follow-up observations of microlensing events are possible and provide independent constraints on the parameters of the lens and source stars, hence breaking some degeneracies in the analysis. UV-to-NIR low-resolution spectrographs like X-shooter (ESO−VLT) could substantially contribute to this follow-up efforts, with magnitude limits above all microlensing events detected so far.Fil: Santerne, A.. Universidade do Porto; PortugalFil: Beaulieu, J. P.. Université Pierre & Marie Curie; FranciaFil: Rojas Ayala, B.. Universidad Andres Bello; ChileFil: Boisse, I.. Laboratoire d’Astrophysique de Marseille; FranciaFil: Schlawin, E.. University Of Arizona; Estados UnidosFil: Almenara, J.-M.. Institut de Planétologie et d’Astrophysique de Grenoble; FranciaFil: Batista, V.. Université Pierre & Marie Curie; FranciaFil: Bennett, D.. National Aeronautics And Space Administration. Goddart Institute For Space Studies; Estados UnidosFil: Diaz, Rodrigo Fernando. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; ArgentinaFil: Figueira, P.. Universidade do Porto; PortugalFil: James, D. J.. Cerro Tololo Inter-American Observatory; ChileFil: Herter, T.. Cornell University; Estados UnidosFil: Lillo Box, J.. European Southern Observatory; ChileFil: Marquette, J. B.. Université Pierre & Marie Curie; FranciaFil: Ranc, C.. Université Pierre & Marie Curi; FranciaFil: Santos, N. C.. Universidade do Porto; PortugalFil: Sousa, S. G.. Universidade do Porto; PortugalEdp Sciences2016-11info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/18441Santerne, A.; Beaulieu, J. P.; Rojas Ayala, B.; Boisse, I.; Schlawin, E.; et al.; Spectroscopic characterisation of microlensing events: Towards a new interpretation of OGLE-2011-BLG-0417; Edp Sciences; Astronomy And Astrophysics; 595; L11; 11-2016; 1-80004-6361CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361/201527710info:eu-repo/semantics/altIdentifier/url/https://arxiv.org/abs/1610.04446info:eu-repo/semantics/altIdentifier/url/https://www.aanda.org/articles/aa/abs/2016/11/aa27710-15/aa27710-15.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 Técnicas2025-09-29T10:07:26Zoai:ri.conicet.gov.ar:11336/18441instacron: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 10:07:27.13CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv	Spectroscopic characterisation of microlensing events: Towards a new interpretation of OGLE-2011-BLG-0417
title	Spectroscopic characterisation of microlensing events: Towards a new interpretation of OGLE-2011-BLG-0417
spellingShingle	Spectroscopic characterisation of microlensing events: Towards a new interpretation of OGLE-2011-BLG-0417 Santerne, A. techniques: spectroscopic techniques: high angular resolution stars: individual: OGLE-2011-BLG-0417
title_short	Spectroscopic characterisation of microlensing events: Towards a new interpretation of OGLE-2011-BLG-0417
title_full	Spectroscopic characterisation of microlensing events: Towards a new interpretation of OGLE-2011-BLG-0417
title_fullStr	Spectroscopic characterisation of microlensing events: Towards a new interpretation of OGLE-2011-BLG-0417
title_full_unstemmed	Spectroscopic characterisation of microlensing events: Towards a new interpretation of OGLE-2011-BLG-0417
title_sort	Spectroscopic characterisation of microlensing events: Towards a new interpretation of OGLE-2011-BLG-0417
dc.creator.none.fl_str_mv	Santerne, A. Beaulieu, J. P. Rojas Ayala, B. Boisse, I. Schlawin, E. Almenara, J.-M. Batista, V. Bennett, D. Diaz, Rodrigo Fernando Figueira, P. James, D. J. Herter, T. Lillo Box, J. Marquette, J. B. Ranc, C. Santos, N. C. Sousa, S. G.
author	Santerne, A.
author_facet	Santerne, A. Beaulieu, J. P. Rojas Ayala, B. Boisse, I. Schlawin, E. Almenara, J.-M. Batista, V. Bennett, D. Diaz, Rodrigo Fernando Figueira, P. James, D. J. Herter, T. Lillo Box, J. Marquette, J. B. Ranc, C. Santos, N. C. Sousa, S. G.
author_role	author
author2	Beaulieu, J. P. Rojas Ayala, B. Boisse, I. Schlawin, E. Almenara, J.-M. Batista, V. Bennett, D. Diaz, Rodrigo Fernando Figueira, P. James, D. J. Herter, T. Lillo Box, J. Marquette, J. B. Ranc, C. Santos, N. C. Sousa, S. G.
author2_role	author author author author author author author author author author author author author author author author
dc.subject.none.fl_str_mv	techniques: spectroscopic techniques: high angular resolution stars: individual: OGLE-2011-BLG-0417
topic	techniques: spectroscopic techniques: high angular resolution stars: individual: OGLE-2011-BLG-0417
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 microlensing event OGLE-2011-BLG-0417 is an exceptionally bright lens binary that was predicted to present radial velocity variation at the level of several km s-1. Pioneer radial velocity follow-up observations with the UVES spectrograph at the ESO−VLT of this system clearly ruled out the large radial velocity variation, leaving a discrepancy between the observation and the prediction. In this paper, we further characterise the microlensing system by analysing its spectral energy distribution (SED) derived using the UVES spectrum and new observations with the ARCoIRIS (CTIO) near-infrared spectrograph and the Keck adaptive optics instrument NIRC2 in the J, H, and Ks-bands. We determine the mass and distance of the stars independently from the microlensing modelling. We find that the SED is compatible with a giant star in the Galactic bulge and a foreground star with a mass of 0.94 ± 0.09 M⊙ at a distance of 1.07 ± 0.24 kpc. We find that this foreground star is likely the lens. Its parameters are not compatible with the ones previously reported in the literature (0.52 ± 0.04 M⊙ at 0.95 ± 0.06 kpc), based on the microlensing light curve. A thoughtful re-analysis of the microlensing event is mandatory to fully understand the reason of this new discrepancy. More importantly, this paper demonstrates that spectroscopic follow-up observations of microlensing events are possible and provide independent constraints on the parameters of the lens and source stars, hence breaking some degeneracies in the analysis. UV-to-NIR low-resolution spectrographs like X-shooter (ESO−VLT) could substantially contribute to this follow-up efforts, with magnitude limits above all microlensing events detected so far. Fil: Santerne, A.. Universidade do Porto; Portugal Fil: Beaulieu, J. P.. Université Pierre & Marie Curie; Francia Fil: Rojas Ayala, B.. Universidad Andres Bello; Chile Fil: Boisse, I.. Laboratoire d’Astrophysique de Marseille; Francia Fil: Schlawin, E.. University Of Arizona; Estados Unidos Fil: Almenara, J.-M.. Institut de Planétologie et d’Astrophysique de Grenoble; Francia Fil: Batista, V.. Université Pierre & Marie Curie; Francia Fil: Bennett, D.. National Aeronautics And Space Administration. Goddart Institute For Space Studies; Estados Unidos Fil: Diaz, Rodrigo Fernando. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; Argentina Fil: Figueira, P.. Universidade do Porto; Portugal Fil: James, D. J.. Cerro Tololo Inter-American Observatory; Chile Fil: Herter, T.. Cornell University; Estados Unidos Fil: Lillo Box, J.. European Southern Observatory; Chile Fil: Marquette, J. B.. Université Pierre & Marie Curie; Francia Fil: Ranc, C.. Université Pierre & Marie Curi; Francia Fil: Santos, N. C.. Universidade do Porto; Portugal Fil: Sousa, S. G.. Universidade do Porto; Portugal
description	The microlensing event OGLE-2011-BLG-0417 is an exceptionally bright lens binary that was predicted to present radial velocity variation at the level of several km s-1. Pioneer radial velocity follow-up observations with the UVES spectrograph at the ESO−VLT of this system clearly ruled out the large radial velocity variation, leaving a discrepancy between the observation and the prediction. In this paper, we further characterise the microlensing system by analysing its spectral energy distribution (SED) derived using the UVES spectrum and new observations with the ARCoIRIS (CTIO) near-infrared spectrograph and the Keck adaptive optics instrument NIRC2 in the J, H, and Ks-bands. We determine the mass and distance of the stars independently from the microlensing modelling. We find that the SED is compatible with a giant star in the Galactic bulge and a foreground star with a mass of 0.94 ± 0.09 M⊙ at a distance of 1.07 ± 0.24 kpc. We find that this foreground star is likely the lens. Its parameters are not compatible with the ones previously reported in the literature (0.52 ± 0.04 M⊙ at 0.95 ± 0.06 kpc), based on the microlensing light curve. A thoughtful re-analysis of the microlensing event is mandatory to fully understand the reason of this new discrepancy. More importantly, this paper demonstrates that spectroscopic follow-up observations of microlensing events are possible and provide independent constraints on the parameters of the lens and source stars, hence breaking some degeneracies in the analysis. UV-to-NIR low-resolution spectrographs like X-shooter (ESO−VLT) could substantially contribute to this follow-up efforts, with magnitude limits above all microlensing events detected so far.
publishDate	2016
dc.date.none.fl_str_mv	2016-11
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/11336/18441 Santerne, A.; Beaulieu, J. P.; Rojas Ayala, B.; Boisse, I.; Schlawin, E.; et al.; Spectroscopic characterisation of microlensing events: Towards a new interpretation of OGLE-2011-BLG-0417; Edp Sciences; Astronomy And Astrophysics; 595; L11; 11-2016; 1-8 0004-6361 CONICET Digital CONICET
url	http://hdl.handle.net/11336/18441
identifier_str_mv	Santerne, A.; Beaulieu, J. P.; Rojas Ayala, B.; Boisse, I.; Schlawin, E.; et al.; Spectroscopic characterisation of microlensing events: Towards a new interpretation of OGLE-2011-BLG-0417; Edp Sciences; Astronomy And Astrophysics; 595; L11; 11-2016; 1-8 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/10.1051/0004-6361/201527710 info:eu-repo/semantics/altIdentifier/url/https://arxiv.org/abs/1610.04446 info:eu-repo/semantics/altIdentifier/url/https://www.aanda.org/articles/aa/abs/2016/11/aa27710-15/aa27710-15.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/
dc.format.none.fl_str_mv	application/pdf application/pdf
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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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

Spectroscopic characterisation of microlensing events: Towards a new interpretation of OGLE-2011-BLG-0417

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