Time evolution of magnetic activity cycles in young suns: The curious case of κ Ceti
Article
Article Title | Time evolution of magnetic activity cycles in young suns: The |
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ERA Journal ID | 1050 |
Article Category | Article |
Authors | Boro Saikia, S. (Author), Luftinger, T. (Author), Folsom, C. P. (Author), Antonova, A. (Author), Alecian, E. (Author), Donati, J. -F. (Author), Guedel, M. (Author), Hall, J. C. (Author), Jeffers, S. V. (Author), Kochukhov, O. (Author), Marsden, S. C. (Author), Metodieva, Y. T. (Author), Mittag, M. (Author), Morin, J. (Author), Perdelwitz, V. (Author), Petit, P. (Author), Schmid, M. (Author) and Vidotto, A. A. (Author) |
Journal Title | Astronomy and Astrophysics: a European journal |
Journal Citation | 658, pp. 1-12 |
Article Number | A16 |
Number of Pages | 12 |
Year | 2022 |
Publisher | EDP Sciences |
Place of Publication | France |
ISSN | 0004-6361 |
1432-0746 | |
Digital Object Identifier (DOI) | https://doi.org/10.1051/0004-6361/202141525 |
Web Address (URL) | https://www.aanda.org/articles/aa/full_html/2022/02/aa41525-21/aa41525-21.html |
Abstract | Context. A detailed investigation of the magnetic properties of young Sun-like stars can provide valuable information on our Sun's magnetic past and its impact on the early Earth. Aims. We determine the properties of the moderately rotating young Sun-like star κ Ceti's magnetic and activity cycles using 50 yr of chromospheric activity data and six epochs of spectropolarimetric observations. Methods. The chromospheric activity was determined by measuring the flux in the CaII H and K lines. A generalised Lomb-Scargle periodogram and a wavelet decomposition were used on the chromospheric activity data to establish the associated periodicities. The vector magnetic field of the star was reconstructed using the technique of Zeeman Doppler imaging on the spectropolarimetric observations. Results. Our period analysis algorithms detect a 3.1 yr chromospheric cycle in addition to the star's well-known ~6 yr cycle period. Although the two cycle periods have an approximate 1:2 ratio, they exhibit an unusual temporal evolution. Additionally, the spectropolarimetric data analysis shows polarity reversals of the star's large-scale magnetic field, suggesting a ~10 yr magnetic or Hale cycle. Conclusions. The unusual evolution of the star's chromospheric cycles and their lack of a direct correlation with the magnetic cycle establishes κ Ceti as a curious young Sun. Such complex evolution of magnetic activity could be synonymous with moderately active young Suns, which is an evolutionary path that our own Sun could have taken. |
Keywords | Stars: activity; Stars: chromospheres; Stars: imaging; Stars: magnetic field; Stars: solar-type |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
Public Notes | File reproduced in accordance with the copyright policy of the publisher/author. |
Byline Affiliations | University of Vienna, Austria |
European Space Agency, France | |
Royal Military College of Canada, Canada | |
Bulgarian Academy of Sciences, Bulgaria | |
Grenoble Alpes University, France | |
University of Toulouse, France | |
Lowell Observatory, United States | |
Max Planck Society, Germany | |
Uppsala University, Sweden | |
Centre for Astrophysics | |
University of Hamburg, Germany | |
University of Montpellier, France | |
Hamburg Observatory, Germany | |
University of Dublin, Ireland | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q7vx7/time-evolution-of-magnetic-activity-cycles-in-young-suns-the-curious-case-of-ceti
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