Properties and Occurrence Rates for Kepler Exoplanet Candidates as a Function of Host Star Metallicity from the DR25 Catalog

Narang, Mayank; Manoj, P.; Furlan, E.; Mordasini, Christoph; Henning, Thomas; Mathew, Blesson; Banyal, Ravinder K.; Sivarani, T. (2018). Properties and Occurrence Rates for Kepler Exoplanet Candidates as a Function of Host Star Metallicity from the DR25 Catalog. The astronomical journal, 156(5), p. 221. American Astronomical Society 10.3847/1538-3881/aae391

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Correlations between the occurrence rate of exoplanets and their host star properties provide important clues about the planet formation processes. We studied the dependence of the observed properties of exoplanets (radius, mass, and orbital period) as a function of their host star metallicity. We analyzed the planetary radii and orbital periods of over 2800 Kepler candidates from the latest Kepler data release DR25 (Q1-Q17) with revised planetary radii based on Gaia~DR2 as a function of host star metallicity (from the Q1-Q17 (DR25) stellar and planet catalog). With a much larger sample and improved radius measurements, we are able to reconfirm previous results in the literature. We show that the average metallicity of the host star increases as the radius of the planet increases. We demonstrate this by first calculating the average host star metallicity for different radius bins and then supplementing these results by calculating the occurrence rate as a function of planetary radius and host star metallicity. We find a similar trend between host star metallicity and planet mass: the average host star metallicity increases with increasing planet mass. This trend, however, reverses for masses >4.0MJ: host star metallicity drops with increasing planetary mass. We further examined the correlation between the host star metallicity and the orbital period of the planet. We find that for planets with orbital periods less than 10 days, the average metallicity of the host star is higher than that for planets with periods greater than 10 days.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Physics Institute
08 Faculty of Science > Physics Institute > Space Research and Planetary Sciences > Theoretical Astrophysics and Planetary Science (TAPS)
08 Faculty of Science > Physics Institute > Space Research and Planetary Sciences
08 Faculty of Science > Physics Institute > NCCR PlanetS

UniBE Contributor:

Mordasini, Christoph

Subjects:

500 Science > 530 Physics
500 Science
500 Science > 520 Astronomy

ISSN:

0004-6256

Publisher:

American Astronomical Society

Language:

English

Submitter:

Janine Jungo

Date Deposited:

13 Jun 2019 16:10

Last Modified:

13 Jun 2019 16:13

Publisher DOI:

10.3847/1538-3881/aae391

ArXiv ID:

1809.08385v1

BORIS DOI:

10.7892/boris.128770

URI:

https://boris.unibe.ch/id/eprint/128770

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