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dc.contributor.author
Metcalfe, T. S.
dc.contributor.author
Buccino, Andrea Paola
dc.contributor.author
Brown, B. P.
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Mathur, S.
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Soderblom, D. R.
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Henry, T. J.
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Mauas, Pablo Jacobo David
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Petrucci, Romina Paola
dc.contributor.author
Hall, J. C.
dc.contributor.author
Basu, S.
dc.date.available
2017-05-29T15:22:06Z
dc.date.issued
2013-02-01
dc.identifier.citation
Metcalfe, T. S.; Buccino, Andrea Paola; Brown, B. P.; Mathur, S.; Soderblom, D. R.; et al.; Magnetic Activity Cycles in the Exoplanet Host Star ǫ Eridani; IOP Publishing; The Astrophysical Journal Letters; 763; 2; 1-2-2013; L26, 1-6
dc.identifier.issn
2041-8205
dc.identifier.uri
http://hdl.handle.net/11336/17059
dc.description.abstract
The active K2 dwarf ǫ 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 ǫ 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 imultaneous 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 ǫ 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.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
IOP Publishing
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Stars: Activity
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Stars: Chromospheres
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Stars: Individual(Hd 22049)
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Surveys
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Astronomía
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Ciencias Físicas
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CIENCIAS NATURALES Y EXACTAS
dc.title
Magnetic Activity Cycles in the Exoplanet Host Star ǫ Eridani
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2017-05-23T19:16:34Z
dc.journal.volume
763
dc.journal.number
2
dc.journal.pagination
L26, 1-6
dc.journal.pais
Estados Unidos
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Philadelphia
dc.description.fil
Fil: Metcalfe, T. S.. Space Science Institute; Estados Unidos
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Fil: Buccino, Andrea Paola. 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
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Fil: Brown, B. P.. University Of Wisconsin; Estados Unidos
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Fil: Mathur, S.. Space Science Institute; Estados Unidos. High Altitude Observatory, NCAR; Estados Unidos
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Fil: Soderblom, D. R.. Space Telescope Science Institute; Estados Unidos
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Fil: Henry, T. J.. Georgia State University; Estados Unidos
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Fil: Mauas, Pablo Jacobo David. 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
dc.description.fil
Fil: Petrucci, Romina Paola. 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. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Juan. Complejo Astronómico "el Leoncito". Universidad Nacional de Córdoba. Complejo Astronómico ; Argentina
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Fil: Hall, J. C.. Lowell Observatory; Estados Unidos
dc.description.fil
Fil: Basu, S.. University Of Yale; Estados Unidos
dc.journal.title
The Astrophysical Journal Letters
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://iopscience.iop.org/article/10.1088/2041-8205/763/2/L26/meta
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1088/2041-8205/763/2/L26
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