The California Legacy Survey. V. Chromospheric Activity Cycles in Main-sequence Stars
Article
Isaacson, Howard, Howard, Andrew W., Fulton, Benjamin, Petigura, Erik A., Weiss, Lauren M., Kane, Stephen R., Carter, Brad, Beard, Corey, Giacalone, Steven, Van Zandt, Judah, Akana Murphy, Joseph M., Dai, Fei, Chontos, Ashley, Polanski, Alex S., Rice, Malena, Lubin, Jack, Brinkman, Casey, Rubenzahl, Ryan A., Blunt, Sarah, ..., Saunders, Nicholas. 2024. "The California Legacy Survey. V. Chromospheric Activity Cycles in Main-sequence Stars." Astrophysical Journal Supplement Series. 274 (2). https://doi.org/10.3847/1538-4365/ad676c
Article Title | The California Legacy Survey. V. Chromospheric Activity Cycles in Main-sequence Stars |
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ERA Journal ID | 1058 |
Article Category | Article |
Authors | Isaacson, Howard, Howard, Andrew W., Fulton, Benjamin, Petigura, Erik A., Weiss, Lauren M., Kane, Stephen R., Carter, Brad, Beard, Corey, Giacalone, Steven, Van Zandt, Judah, Akana Murphy, Joseph M., Dai, Fei, Chontos, Ashley, Polanski, Alex S., Rice, Malena, Lubin, Jack, Brinkman, Casey, Rubenzahl, Ryan A., Blunt, Sarah, Yee, Samuel W., MacDougall, Mason G., Dalba, Paul A., Tyler, Dakotah, Behmard, Aida, Angelo, Isabel, Pidhorodetska, Daria, Mayo, Andrew W., Holcomb, Rae, Turtelboom, Emma V., Hill, Michelle L., Bouma, Luke G., Zhang, Jingwen, Crossfield, Ian J. M. and Saunders, Nicholas |
Journal Title | Astrophysical Journal Supplement Series |
Journal Citation | 274 (2) |
Article Number | 35 |
Number of Pages | 22 |
Year | 2024 |
01 Oct 2024 | |
Publisher | IOP Publishing |
Place of Publication | United States |
ISSN | 0067-0049 |
1538-4365 | |
Digital Object Identifier (DOI) | https://doi.org/10.3847/1538-4365/ad676c |
Web Address (URL) | https://iopscience.iop.org/article/10.3847/1538-4365/ad676c |
Abstract | We present optical spectroscopy of 710 solar neighborhood stars collected over 20 years to catalog chromospheric activity and search for stellar activity cycles. The California Legacy Survey stars are amenable to exoplanet detection using precise radial velocities, and we present their Ca II H and K time series as a proxy for stellar and chromospheric activity. Using the High Resolution Echelle Spectrometer at Keck Observatory, we measured stellar flux in the cores of the Ca II H and K lines to determine S-values on the Mount Wilson scale and the <inline-formula> </inline-formula> metric, which is comparable across a wide range of spectral types. From the 710 stars, with 52,372 observations, 285 stars were sufficiently sampled to search for stellar activity cycles with periods of 2–25 yr, and 138 stars showed stellar cycles of varying length and amplitude. S-values can be used to mitigate stellar activity in the detection and characterization of exoplanets. We used them to probe stellar dynamos and to place the Sun's magnetic activity into context among solar neighborhood stars. Using precise stellar parameters and time-averaged activity measurements, we found tightly constrained cycle periods as a function of stellar temperature between <inline-formula> </inline-formula> of ‑4.7 and ‑4.9, a range of activity in which nearly every star has a periodic cycle. These observations present the largest sample of spectroscopically determined stellar activity cycles to date. |
Keywords | Stellar astronomy; Time series analysis; Main sequence stars; Optical telescopes; High resolution spectroscopy; Stellar evolution; Stellar activity; Stellar chromospheres |
Related Output | |
Is part of | Stellar chromospheric activity in main-sequence stars |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 510199. Astronomical sciences not elsewhere classified |
Public Notes | This article is part of a UniSQ Thesis by publication. See Related Output. |
Byline Affiliations | Centre for Astrophysics |
University of California Riverside, United Sates | |
California Institute of Technology (Caltech), United States | |
NASA Exoplanet Science Institute, United States | |
University of California Los Angeles, United States | |
University of Notre Dame, United States | |
School of Mathematics, Physics and Computing | |
University of California Irvine, United States | |
University of California Santa Cruz, United States | |
University of Hawaii, United States | |
Princeton University, United States | |
University of Kansas, United States | |
Yale University, United States | |
Northwestern University, United States | |
American Museum of Natural History, United States | |
University of Copenhagen, Denmark |
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https://research.usq.edu.au/item/zv279/the-california-legacy-survey-v-chromospheric-activity-cycles-in-main-sequence-stars
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