The California-Kepler Survey. XI. A Survey of Chromospheric Activity through the Lens of Precise Stellar Properties
Article
Isaacson, Howard, Kane, Stephen R., Carter, Brad, Howard, Andrew W., Weiss, Lauren, Petigura, Erik A. and Fulton, Benjamin. 2024. "The California-Kepler Survey. XI. A Survey of Chromospheric Activity through the Lens of Precise Stellar Properties." The Astrophysical Journal: an international review of astronomy and astronomical physics. 961 (1). https://doi.org/10.3847/1538-4357/ad077b
Article Title | The California-Kepler Survey. XI. A Survey of Chromospheric Activity through the Lens of Precise Stellar Properties |
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ERA Journal ID | 1057 |
Article Category | Article |
Authors | Isaacson, Howard, Kane, Stephen R., Carter, Brad, Howard, Andrew W., Weiss, Lauren, Petigura, Erik A. and Fulton, Benjamin |
Journal Title | The Astrophysical Journal: an international review of astronomy and astronomical physics |
Journal Citation | 961 (1) |
Number of Pages | 22 |
Year | 2024 |
Publisher | IOP Publishing |
Place of Publication | United States |
ISSN | 0004-637X |
1538-4357 | |
Digital Object Identifier (DOI) | https://doi.org/10.3847/1538-4357/ad077b |
Web Address (URL) | https://iopscience.iop.org/article/10.3847/1538-4357/ad077b |
Abstract | Surveys of exoplanet host stars are valuable tools for assessing population level trends in exoplanets, and their outputs can include stellar ages, activity, and rotation periods. We extracted chromospheric activity measurements from the California-Kepler Survey Gaia survey spectra in order to probe connections between stellar activity and fundamental stellar properties. Building on the California Kepler Survey's legacy of 1189 planet host star stellar properties including temperature, surface gravity metallicity, and isochronal age, we add measurements of the Ca ii H and K lines as a proxy for chromospheric activity for 879 planet hosting stars. We used these chromospheric activity measurements to derive stellar rotation periods. We find a discrepancy between photometrically derived and activity-derived rotation periods for stars on the Rossby Ridge. These results support the theory of weakened magnetic braking. We find no evidence for metallicity-dependent activity relations, within the metallicity range of −0.2 to +0.3 dex. With our single epoch spectra we identify stars that are potentially in Maunder minimum-like state using a combination of log( R HK ′ ) and position below the main sequence. We do not yet have the multiyear time series needed to verify stars in Maunder minimum-like states. These results can help inform future theoretical studies that explore the relationship between stellar activity, stellar rotation, and magnetic dynamos. |
Keywords | Stellar chromospheres; Exoplanet astronomy ; Stellar activity |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 5101. Astronomical sciences |
Byline Affiliations | University of California Berkeley, United States |
Centre for Astrophysics | |
University of California Riverside, United Sates | |
California Institute of Technology (Caltech), United States | |
University of Notre Dame, United States | |
University of California Los Angeles, United States | |
NASA Exoplanet Science Institute, United States |
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