Dependence of Small Planet Frequency on Stellar Metallicity Hidden by Their Prevalence
Article
Article Title | Dependence of Small Planet Frequency on Stellar Metallicity Hidden by Their Prevalence |
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ERA Journal ID | 1057 |
Article Category | Article |
Authors | Zhu, Wei (Author), Wang, Ji (Author) and Huang, Chelsea (Author) |
Journal Title | The Astrophysical Journal: an international review of astronomy and astronomical physics |
Journal Citation | 832 (2), pp. 1-8 |
Article Number | 196 |
Number of Pages | 8 |
Year | 2016 |
Publisher | IOP Publishing |
Place of Publication | United States |
ISSN | 0004-637X |
1538-4357 | |
Digital Object Identifier (DOI) | https://doi.org/10.3847/0004-637x/832/2/196 |
Web Address (URL) | https://iopscience.iop.org/article/10.3847/0004-637X/832/2/196 |
Abstract | The dependence of gas giant planet occurrence rate on stellar metallicity has been firmly established. We extend this so-called planet-metallicity correlation to broader ranges of metallicities and planet masses/radii. In particular, we assume that the planet-metallicity correlation is a power law below some critical saturation threshold, and that the probability of hosting at least one planet is unity for stars with metallicity above the threshold. We then are able to explain the discrepancy between the tentative detection and null detection in previous studies regarding the planet-metallicity correlation for small planets. In particular, we find that the null detection of this correlation can be attributed to the combination of high planet occurrence rate and low detection efficiency. Therefore, a planet-metallicity correlation for small planets cannot be ruled out. We propose that stars with metallicities lower than the solar value are better targets for testing the planet-metallicity correlation for small planets. |
Keywords | methods: statistical; planetary systems; planets and satellites: fundamental parameters; stars: abundances; Astrophysics - Earth and Planetary Astrophysics |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
Byline Affiliations | Ohio State University, United States |
California Institute of Technology (Caltech), United States | |
University of Toronto, Canada | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q722q/dependence-of-small-planet-frequency-on-stellar-metallicity-hidden-by-their-prevalence
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