Dependence of Small Planet Frequency on Stellar Metallicity Hidden by Their Prevalence
arXiv:1605.04310 · doi: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.
10 pages, 3 figures, ApJ accepted
References in corpus (10)
- Most 1.6 Earth-Radius Planets are not Rocky
- Spectroscopic parameters for 451 stars in the HARPS GTO planet search program. Stellar [Fe/H] and the frequency of exo-Neptunes
- Formation of Hot Planets by a combination of planet scattering, tidal circularization, and Kozai mechanism
- Planet formation around stars of various masses: The snow line and the frequency of giant planets
- False positive probabilties for all Kepler Objects of Interest: 1284 newly validated planets and 428 likely false positives
- Three regimes of extrasolar planets inferred from host star metallicities
- Hot super-Earths stripped by their host stars
- Planetary Candidates Observed by Kepler VI: Planet Sample from Q1-Q16 (47 Months)
- Planetary Candidates Observed by Kepler V: Planet Sample from Q1-Q12 (36 Months)
- A Continuum of Planet Formation Between 1 and 4 Earth Radii
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