Exoplanets & Exomoons

Constraining Planetary Formation Models Using Conditional Occurrences of Various Planet Types

By Keith Cowing
Status Report
February 28, 2024
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Constraining Planetary Formation Models Using Conditional Occurrences of Various Planet Types
The plots of stellar metallicity ([Fe/H]) versus planetary orbital period for all transiting planets from the NASA exoplanet archive. Tranet stands for transiting planet. The transiting planets are split into four groups based on the multiplicity of their systems and are placed on four different panels. The two dotted vertical lines split the metallicity range into three metallicity regions, namely, sub-solar, solar, and super-solar. While low-multiplicity systems are evenly distributed across hosts of all metallicities there is a paucity of high-multiplicity systems around hosts of high metallicity indicating the effect of cold Jupiters on the inner planet multiplicity. — astro-ph.EP

We report the conditional occurrences between three planetary types: super-Earths (m sin i < 10 M⊕, P < 100 days), warm Jupiters (m sin i > 95 M⊕, 10 < P < 100 days), and cold Jupiters (m sin i > 95 M⊕, P > 400 days) for sun-like stars.

We find that while the occurrence of cold Jupiters in systems with super-Earths is 22.2+8.3−5.4%, compared to 10% for the absolute occurrence rate of cold Jupiters, the occurrence of super-Earths in systems with cold Jupiters is 66.0+18.0−16.0%, compared to 30% for the absolute occurrence rate of super-Earths for sun-like stars. We find that the enhancement of super-Earths in systems with cold Jupiters is evident for sun-like stars, in agreement with several previous studies.

We also conduct occurrence studies between warm Jupiters and super-Earths, and between warm Jupiters and cold Jupiters, to consolidate our methods. We conduct an independent observational test to study the effects of cold Jupiters against the inner multiplicity using the well-established giant planet host star metallicity correlation for all transiting planets found to date.

The conditional occurrences we find here can be used to constrain the validity of various planetary formation models. The extremely interesting correlations between the super-Earths, cold Jupiters, and warm Jupiters can also be used to understand the formation histories of these planetary types.

Sridhar Gajendran, Ing-Guey Jiang, Li-Chin Yeh, Devesh P. Sariya (NTHU)

Comments: 9 pages, 3 tables, 3 figures, published in MNRAS Advance Access
Subjects: Earth and Planetary Astrophysics (astro-ph.EP)
Cite as: arXiv:2402.17212 [astro-ph.EP] (or arXiv:2402.17212v1 [astro-ph.EP] for this version)
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Journal reference: March 2024, MNRAS, 528, 7202
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Submission history
From: Ing-Guey Jiang
[v1] Tue, 27 Feb 2024 05:09:37 UTC (182 KB)

Explorers Club Fellow, ex-NASA Space Station Payload manager/space biologist, Away Teams, Journalist, Lapsed climber, Synaesthete, Na’Vi-Jedi-Freman-Buddhist-mix, ASL, Devon Island and Everest Base Camp veteran, (he/him) 🖖🏻