Magnetic activity cycles in the exoplanet host star ε eridani

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The active K2 dwarf ε Eri has been extensively characterized both as a young solar analog and more recently as an exoplanet host star. As one of the nearest and brightest stars in the sky, it provides an unparalleled opportunity to constrain stellar dynamo theory beyond the Sun. We confirm and docum...

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Autores principales: Metcalfe, T.S., Buccino, A.P., Brown, B.P., Mathur, S., Soderblom, D.R., Henry, T.J., Mauas, P.J.D., Petrucci, R., Hall, J.C., Basu, S.
Formato: Artículo publishedVersion
Lenguaje:Inglés
Publicado: 2013
Materias:
stars: activity
stars: chromospheres
stars: individual (HD 22049)
surveys
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_20418205_v763_n2_p_Metcalfe
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paperaa:paper_20418205_v763_n2_p_Metcalfe
record_format dspace
spelling paperaa:paper_20418205_v763_n2_p_Metcalfe2023-06-12T16:51:54Z Magnetic activity cycles in the exoplanet host star ε eridani Astrophys. J. Lett. 2013;763(2) Metcalfe, T.S. Buccino, A.P. Brown, B.P. Mathur, S. Soderblom, D.R. Henry, T.J. Mauas, P.J.D. Petrucci, R. Hall, J.C. Basu, S. stars: activity stars: chromospheres stars: individual (HD 22049) surveys The active K2 dwarf ε Eri has been extensively characterized both as a young solar analog and more recently as an exoplanet host star. As one of the nearest and brightest stars in the sky, it provides an unparalleled opportunity to constrain stellar dynamo theory beyond the Sun. We confirm and document the 3-year magnetic activity cycle in ε Eri originally reported by Hatzes and coworkers, and we examine the archival data from previous observations spanning 45 years. The data show coexisting 3-year and 13-year periods leading into a broad activity minimum that resembles a Maunder minimum-like state, followed by the resurgence of a coherent 3-year cycle. The nearly continuous activity record suggests the simultaneous operation of two stellar dynamos with cycle periods of 2.95 ± 0.03 years and 12.7 ± 0.3 years, which, by analogy with the solar case, suggests a revised identification of the dynamo mechanisms that are responsible for the so-called "active" and "inactive" sequences as proposed by Böhm-Vitense. Finally, based on the observed properties of ε Eri, we argue that the rotational history of the Sun is what makes it an outlier in the context of magnetic cycles observed in other stars (as also suggested by its Li depletion), and that a Jovian-mass companion cannot be the universal explanation for the solar peculiarities. © 2013. The American Astronomical Society. All rights reserved.. Fil:Buccino, A.P. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Mauas, P.J.D. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Petrucci, R. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2013 info:eu-repo/semantics/article info:ar-repo/semantics/artículo info:eu-repo/semantics/publishedVersion application/pdf eng info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_20418205_v763_n2_p_Metcalfe
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
language Inglés
orig_language_str_mv eng
topic stars: activity
stars: chromospheres
stars: individual (HD 22049)
surveys
spellingShingle stars: activity
stars: chromospheres
stars: individual (HD 22049)
surveys
Metcalfe, T.S.
Buccino, A.P.
Brown, B.P.
Mathur, S.
Soderblom, D.R.
Henry, T.J.
Mauas, P.J.D.
Petrucci, R.
Hall, J.C.
Basu, S.
Magnetic activity cycles in the exoplanet host star ε eridani
topic_facet stars: activity
stars: chromospheres
stars: individual (HD 22049)
surveys
description The active K2 dwarf ε Eri has been extensively characterized both as a young solar analog and more recently as an exoplanet host star. As one of the nearest and brightest stars in the sky, it provides an unparalleled opportunity to constrain stellar dynamo theory beyond the Sun. We confirm and document the 3-year magnetic activity cycle in ε Eri originally reported by Hatzes and coworkers, and we examine the archival data from previous observations spanning 45 years. The data show coexisting 3-year and 13-year periods leading into a broad activity minimum that resembles a Maunder minimum-like state, followed by the resurgence of a coherent 3-year cycle. The nearly continuous activity record suggests the simultaneous operation of two stellar dynamos with cycle periods of 2.95 ± 0.03 years and 12.7 ± 0.3 years, which, by analogy with the solar case, suggests a revised identification of the dynamo mechanisms that are responsible for the so-called "active" and "inactive" sequences as proposed by Böhm-Vitense. Finally, based on the observed properties of ε Eri, we argue that the rotational history of the Sun is what makes it an outlier in the context of magnetic cycles observed in other stars (as also suggested by its Li depletion), and that a Jovian-mass companion cannot be the universal explanation for the solar peculiarities. © 2013. The American Astronomical Society. All rights reserved..
format Artículo
Artículo
publishedVersion
author Metcalfe, T.S.
Buccino, A.P.
Brown, B.P.
Mathur, S.
Soderblom, D.R.
Henry, T.J.
Mauas, P.J.D.
Petrucci, R.
Hall, J.C.
Basu, S.
author_facet Metcalfe, T.S.
Buccino, A.P.
Brown, B.P.
Mathur, S.
Soderblom, D.R.
Henry, T.J.
Mauas, P.J.D.
Petrucci, R.
Hall, J.C.
Basu, S.
author_sort Metcalfe, T.S.
title Magnetic activity cycles in the exoplanet host star ε eridani
title_short Magnetic activity cycles in the exoplanet host star ε eridani
title_full Magnetic activity cycles in the exoplanet host star ε eridani
title_fullStr Magnetic activity cycles in the exoplanet host star ε eridani
title_full_unstemmed Magnetic activity cycles in the exoplanet host star ε eridani
title_sort magnetic activity cycles in the exoplanet host star ε eridani
publishDate 2013
url http://hdl.handle.net/20.500.12110/paper_20418205_v763_n2_p_Metcalfe
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