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  Where Have All the Solar-like Stars Gone? Rotation Period Detectability at Various Inclinations and Metallicities

Reinhold, T., Shapiro, A., Witzke, V., Nèmec, N.-E., Işık, E., & Solanki, S. K. (2021). Where Have All the Solar-like Stars Gone? Rotation Period Detectability at Various Inclinations and Metallicities. The Astrophysical Journal Letters, 908(2): L21. doi:10.3847/2041-8213/abde46.

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 Creators:
Reinhold, Timo1, Author              
Shapiro, Alexander2, Author              
Witzke, Veronika2, Author              
Nèmec, Nina-Elisabeth2, Author              
Işık, Emre, Author
Solanki, Sami K.2, Author              
Affiliations:
1ERC Starting Grant: Connecting Solar and Stellar Variabilities (SOLVe), Max Planck Institute for Solar System Research, Max Planck Society, ou_3164811              
2Department Sun and Heliosphere, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832289              

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Free keywords: Stellar rotation; Detection
 Abstract: The plethora of photometric data collected by the Kepler space telescope has promoted the detection of tens of thousands of stellar rotation periods. However, these periods are not found to an equal extent among different spectral types. Interestingly, early G-type stars with near-solar rotation periods are strongly underrepresented among those stars with known rotation periods. In this study we investigate whether the small number of such stars can be explained by difficulties in the period determination from photometric time series. For that purpose, we generate model light curves of early G-type stars with solar rotation periods for different inclination angles, metallicities, and (magnitude-dependent) noise levels. We find that the detectability is determined by the predominant type of activity (i.e., spot or faculae domination) on the surface, which defines the degree of irregularity of the light curve, and further depends on the level of photometric noise. These two effects significantly complicate the period detection and explain the lack of solar-like stars with known near-solar rotation periods. We conclude that the rotation periods of the majority of solar-like stars with near-solar rotation periods remain undetected to date. Finally, we promote the use of new techniques to recover more periods of near-solar rotators.

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Language(s): eng - English
 Dates: 2021
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.3847/2041-8213/abde46
 Degree: -

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Title: The Astrophysical Journal Letters
  Other : Astrophys. J. Lett.
Source Genre: Journal
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Publ. Info: Chicago, IL : University of Chicago Press for the American Astronomical Society
Pages: - Volume / Issue: 908 (2) Sequence Number: L21 Start / End Page: - Identifier: ISSN: 0004-637X
CoNE: https://pure.mpg.de/cone/journals/resource/954922828215