CARMENES input catalog of M dwarfs VI. A time-resolved Ca II H&K catalog from archival data

Context. Radial-velocity (RV) jitter caused by stellar magnetic activity is an important factor in state-of-the-art exoplanet discovery surveys such as CARMENES. Stellar rotation, along with heterogeneities in the photosphere and chromosphere caused by activity, can result in false-positive planet d...

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Detalles Bibliográficos
Autores: Caballero, J. A., Cortés Contreras, Miriam, Montes Gutiérrez, David
Tipo de recurso: artículo
Fecha de publicación:2021
País:España
Institución:Universidad Complutense de Madrid (UCM)
Repositorio:Docta Complutense
Idioma:inglés
OAI Identifier:oai:docta.ucm.es:20.500.14352/4452
Acceso en línea:https://hdl.handle.net/20.500.14352/4452
Access Level:acceso abierto
Palabra clave:52
High-resoloution spectroscopy
Stellar model chromospheres
Late-type stars
Low-mass stars
Main-sequence
Magnetic activity
Rotation periods
Super-Earth
Exoplanets
Search
Astrofísica
Astronomía (Física)
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oai_identifier_str oai:docta.ucm.es:20.500.14352/4452
network_acronym_str ES
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repository_id_str
spelling CARMENES input catalog of M dwarfs VI. A time-resolved Ca II H&K catalog from archival dataCaballero, J. A.Cortés Contreras, MiriamMontes Gutiérrez, David52High-resoloution spectroscopyStellar model chromospheresLate-type starsLow-mass starsMain-sequenceMagnetic activityRotation periodsSuper-EarthExoplanetsSearchAstrofísicaAstronomía (Física)Context. Radial-velocity (RV) jitter caused by stellar magnetic activity is an important factor in state-of-the-art exoplanet discovery surveys such as CARMENES. Stellar rotation, along with heterogeneities in the photosphere and chromosphere caused by activity, can result in false-positive planet detections. Hence, it is necessary to determine the stellar rotation period and compare it to any putative planetary RV signature. Long-term measurements of activity indicators such as the chromospheric emission in the Ca ii H&K lines (R’_(HK)) enable the identification of magnetic activity cycles. Aims. In order to determine stellar rotation periods and study the long-term behavior of magnetic activity of the CARMENES guaranteed time observations (GTO) sample, it is advantageous to extract R 0 HK time series from archival data, since the CARMENES spectrograph does not cover the blue range of the stellar spectrum containing the Ca ii H&K lines. Methods. We have assembled a catalog of 11 634 archival spectra of 186 M dwarfs acquired by seven different instruments covering the Ca ii H&K regime: ESPaDOnS, FEROS, HARPS, HIRES, NARVAL, TIGRE, and UVES. The relative chromospheric flux in these lines, R’_(HK), was directly extracted from the spectra by rectification with PHOENIX synthetic spectra via narrow passbands around the Ca ii H&K line cores. Results. The combination of archival spectra from various instruments results in time series for 186 stars from the CARMENES GTO sample. As an example of the use of the catalog, we report the tentative discovery of three previously unknown activity cycles of M dwarfs. Conclusions. We conclude that the method of extracting R 0 HK with the use of model spectra yields consistent results for different instruments and that the compilation of this catalog will enable the analysis of long-term activity time series for a large number of M dwarfs.EDP ScienciesUniversidad Complutense de Madrid20212021-08-2020212021-08-20journal articlehttp://purl.org/coar/resource_type/c_6501info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/20.500.14352/4452reponame:Docta Complutenseinstname:Universidad Complutense de Madrid (UCM)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:docta.ucm.es:20.500.14352/44522026-06-02T12:44:21Z
dc.title.none.fl_str_mv CARMENES input catalog of M dwarfs VI. A time-resolved Ca II H&K catalog from archival data
title CARMENES input catalog of M dwarfs VI. A time-resolved Ca II H&K catalog from archival data
spellingShingle CARMENES input catalog of M dwarfs VI. A time-resolved Ca II H&K catalog from archival data
Caballero, J. A.
52
High-resoloution spectroscopy
Stellar model chromospheres
Late-type stars
Low-mass stars
Main-sequence
Magnetic activity
Rotation periods
Super-Earth
Exoplanets
Search
Astrofísica
Astronomía (Física)
title_short CARMENES input catalog of M dwarfs VI. A time-resolved Ca II H&K catalog from archival data
title_full CARMENES input catalog of M dwarfs VI. A time-resolved Ca II H&K catalog from archival data
title_fullStr CARMENES input catalog of M dwarfs VI. A time-resolved Ca II H&K catalog from archival data
title_full_unstemmed CARMENES input catalog of M dwarfs VI. A time-resolved Ca II H&K catalog from archival data
title_sort CARMENES input catalog of M dwarfs VI. A time-resolved Ca II H&K catalog from archival data
dc.creator.none.fl_str_mv Caballero, J. A.
Cortés Contreras, Miriam
Montes Gutiérrez, David
author Caballero, J. A.
author_facet Caballero, J. A.
Cortés Contreras, Miriam
Montes Gutiérrez, David
author_role author
author2 Cortés Contreras, Miriam
Montes Gutiérrez, David
author2_role author
author
dc.contributor.none.fl_str_mv Universidad Complutense de Madrid
dc.subject.none.fl_str_mv 52
High-resoloution spectroscopy
Stellar model chromospheres
Late-type stars
Low-mass stars
Main-sequence
Magnetic activity
Rotation periods
Super-Earth
Exoplanets
Search
Astrofísica
Astronomía (Física)
topic 52
High-resoloution spectroscopy
Stellar model chromospheres
Late-type stars
Low-mass stars
Main-sequence
Magnetic activity
Rotation periods
Super-Earth
Exoplanets
Search
Astrofísica
Astronomía (Física)
description Context. Radial-velocity (RV) jitter caused by stellar magnetic activity is an important factor in state-of-the-art exoplanet discovery surveys such as CARMENES. Stellar rotation, along with heterogeneities in the photosphere and chromosphere caused by activity, can result in false-positive planet detections. Hence, it is necessary to determine the stellar rotation period and compare it to any putative planetary RV signature. Long-term measurements of activity indicators such as the chromospheric emission in the Ca ii H&K lines (R’_(HK)) enable the identification of magnetic activity cycles. Aims. In order to determine stellar rotation periods and study the long-term behavior of magnetic activity of the CARMENES guaranteed time observations (GTO) sample, it is advantageous to extract R 0 HK time series from archival data, since the CARMENES spectrograph does not cover the blue range of the stellar spectrum containing the Ca ii H&K lines. Methods. We have assembled a catalog of 11 634 archival spectra of 186 M dwarfs acquired by seven different instruments covering the Ca ii H&K regime: ESPaDOnS, FEROS, HARPS, HIRES, NARVAL, TIGRE, and UVES. The relative chromospheric flux in these lines, R’_(HK), was directly extracted from the spectra by rectification with PHOENIX synthetic spectra via narrow passbands around the Ca ii H&K line cores. Results. The combination of archival spectra from various instruments results in time series for 186 stars from the CARMENES GTO sample. As an example of the use of the catalog, we report the tentative discovery of three previously unknown activity cycles of M dwarfs. Conclusions. We conclude that the method of extracting R 0 HK with the use of model spectra yields consistent results for different instruments and that the compilation of this catalog will enable the analysis of long-term activity time series for a large number of M dwarfs.
publishDate 2021
dc.date.none.fl_str_mv 2021
2021-08-20
2021
2021-08-20
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/20.500.14352/4452
url https://hdl.handle.net/20.500.14352/4452
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
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
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv EDP Sciencies
publisher.none.fl_str_mv EDP Sciencies
dc.source.none.fl_str_mv reponame:Docta Complutense
instname:Universidad Complutense de Madrid (UCM)
instname_str Universidad Complutense de Madrid (UCM)
reponame_str Docta Complutense
collection Docta Complutense
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,300719

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