Observations of Intensity Fluctuations Attributed to Granulation and Faculae on Sun-like Stars from the Kepler Mission

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  • C. Karoff
  • T. L. Campante, Centro de Astrofísica and Faculdade de Ciências, Universidade do Porto, Rua das Estrelas, 4150-762 Porto, Portugal
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  • J. Ballot, CNRS, Institut de Recherche en Astrophysique et Planétologie, 14 avenue Édouard Belin, F-31400, Toulouse, France
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  • T. Kallinger, Instituut voor Sterrenkunde, K. U. Leuven, Celestijnenlaan 200D, B-3001 Leuven, Belgium
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  • M. Gruberbauer, Institute for Computational Astrophysics, Department of Astronomy and Physics, Saint Mary's University, B3H 3C3 Halifax, Canada
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  • R. A. García, Laboratoire AIM, CEA/DSM-CNRS-Universit Paris Diderot, IRFU/SAp, Centre de Saclay, F-91191 Gif-sur-Yvette Cedex, France
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  • D. A. Caldwell, SETI Institute/NASA Ames Research Center, Moffett Field, CA 94035, USA
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  • J. L. Christiansen, SETI Institute/NASA Ames Research Center, Moffett Field, CA 94035, USA
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  • K. Kinemuchi, Bay Area Environmental Research Inst./NASA Ames Research Center, Moffett Field, CA 94035, USA
Sun-like stars show intensity fluctuations on a number of timescales due to various physical phenomena on their surfaces. These phenomena can convincingly be studied in the frequency spectra of these stars—while the strongest signatures usually originate from spots, granulation, and p-mode oscillations, it has also been suggested that the frequency spectrum of the Sun contains a signature of faculae. We have analyzed three stars observed for 13 months in short cadence (58.84 s sampling) by the Kepler mission. The frequency spectra of all three stars, as for the Sun, contain signatures that we can attribute to granulation, faculae, and p-mode oscillations. The temporal variability of the signatures attributed to granulation, faculae, and p-mode oscillations was analyzed and the analysis indicates a periodic variability in the granulation and faculae signatures—comparable to what is seen in the Sun.
Original languageEnglish
JournalAstrophysical Journal
Volume767
Issue1
Pages (from-to)34
ISSN0004-637X
DOIs
Publication statusPublished - 1 Apr 2013

    Research areas

  • stars: activity, stars: individual: KIC 6603624 KIC 6933899 KIC 11244118, stars: oscillations, stars: solar-type

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