Kepler's Missing Planets

Abstract

We investigate the distributions of the orbital period ratios of adjacent planets in high multiplicity \kepler\ systems (four or more planets) and low multiplicity systems (two planets). Modeling the low multiplicity sample as essentially equivalent to the high multiplicity sample, but with unobserved intermediate planets, we find some evidence for an excess of planet pairs between the 2:1 and 3:1 Mean Motion Resonances in the low multiplicity sample. This possible excess may be the result of strong dynamical interactions near these or other resonances or it may be a byproduct of other evolutionary events or processes such as planetary collisions. Three planet systems show a significant excess of planets near the 2:1 Mean Motion Resonance that is not as prominent in either of the other samples. This observation may imply a correlation between strong dynamical interactions and observed planet number---perhaps a relationship between resonance pairs and the inclinations or orbital periods of additional planets. The period ratio distributions can also be used to identify targets to search for missing planets in the each of the samples, the presence or absence of which would have strong implications for planet formation and dynamical evolution models.

Accepted to MNRAS

References in corpus (9)

• DHP Framework: Digital Health Passports Using Blockchain -- Use case on international tourism during the COVID-19 pandemic
• The Transiting Circumbinary Planets Kepler-34 and Kepler-35
• Resonant Repulsion of Kepler Planet Pairs
• The Neptune-Sized Circumbinary Planet Kepler-38b
• Transit Timing Observations from Kepler: VII. Confirmation of 27 planets in 13 multiplanet systems via Transit Timing Variations and orbital stability
• Planets Near Mean-Motion Resonances
• Are Planetary Systems Filled to Capacity? A Study Based on Kepler Results
• On The Relative Sizes of Planets Within Kepler Multiple Candidate Systems
• Five Kepler target stars that show multiple transiting exoplanet candidates

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