Artículo

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" (2013) Astrophysical Journal Letters. 763(2)
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Abstract:

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..

Registro:

Documento: Artículo
Título:Magnetic activity cycles in the exoplanet host star ε eridani
Autor: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.
Filiación:Space Science Institute, 4750 Walnut Street, Boulder, CO 80301, United States
Instituto de Astronomía y Física Del Espacio (CONICET), C.C. 67 Sucursal 28, C1428EHA-Buenos Aires, Argentina
Departamento de Física, FCEyN, Universidad de Buenos Aires, 1428 Caba, Argentina
Department of Astronomy, Center for Magnetic Self-Organization, University of Wisconsin, Madison, WI 53706-1582, United States
High Altitude Observatory, NCAR, P.O. Box 3000, Boulder, CO 80307, United States
Space Telescope Science Institute, 3700 San Martin Dr., Baltimore, MD 21218, United States
Department of Physics and Astronomy, Georgia State University, Atlanta, GA 30302, United States
Lowell Observatory, 1400 West Mars Hill Road, Flagstaff, AZ 86001, United States
Department of Astronomy, Yale University, P.O. Box 208101, New Haven, CT 06520, United States
Palabras clave:stars: activity; stars: chromospheres; stars: individual (HD 22049); surveys
Año:2013
Volumen:763
Número:2
DOI: http://dx.doi.org/10.1088/2041-8205/763/2/L26
Handle:http://hdl.handle.net/20.500.12110/paper_20418205_v763_n2_p_Metcalfe
Título revista:Astrophysical Journal Letters
Título revista abreviado:Astrophys. J. Lett.
ISSN:20418205
PDF:https://bibliotecadigital.exactas.uba.ar/download/paper/paper_20418205_v763_n2_p_Metcalfe.pdf
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_20418205_v763_n2_p_Metcalfe

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Citas:

---------- APA ----------
Metcalfe, T.S., Buccino, A.P., Brown, B.P., Mathur, S., Soderblom, D.R., Henry, T.J., Mauas, P.J.D.,..., Basu, S. (2013) . Magnetic activity cycles in the exoplanet host star ε eridani. Astrophysical Journal Letters, 763(2).
http://dx.doi.org/10.1088/2041-8205/763/2/L26
---------- CHICAGO ----------
Metcalfe, T.S., Buccino, A.P., Brown, B.P., Mathur, S., Soderblom, D.R., Henry, T.J., et al. "Magnetic activity cycles in the exoplanet host star ε eridani" . Astrophysical Journal Letters 763, no. 2 (2013).
http://dx.doi.org/10.1088/2041-8205/763/2/L26
---------- MLA ----------
Metcalfe, T.S., Buccino, A.P., Brown, B.P., Mathur, S., Soderblom, D.R., Henry, T.J., et al. "Magnetic activity cycles in the exoplanet host star ε eridani" . Astrophysical Journal Letters, vol. 763, no. 2, 2013.
http://dx.doi.org/10.1088/2041-8205/763/2/L26
---------- VANCOUVER ----------
Metcalfe, T.S., Buccino, A.P., Brown, B.P., Mathur, S., Soderblom, D.R., Henry, T.J., et al. Magnetic activity cycles in the exoplanet host star ε eridani. Astrophys. J. Lett. 2013;763(2).
http://dx.doi.org/10.1088/2041-8205/763/2/L26