Architectures of Compact Super-Earth Systems Shaped by Instabilities

Abstract

Compact non-resonant systems of sub-Jovian planets are the most common outcome of the planet formation process. Despite exhibiting broad overall diversity, these planets also display dramatic signatures of intra-system uniformity in their masses, radii, and orbital spacings. Although the details of their formation and early evolution are poorly known, sub-Jovian planets are expected to emerge from their natal nebulae as multi-resonant chains, owing to planet-disk interactions. Within the context of this scenario, the architectures of observed exoplanet systems can be broadly replicated if resonances are disrupted through post-nebular dynamical instabilities. Here, we generate an ad-hoc sample of resonant chains and use a suite of N-body simulations to show that instabilities can not only reproduce the observed period ratio distribution, but that the resulting collisions also modify the mass uniformity in a way that is consistent with the data. Furthermore, we demonstrate that primordial mass uniformity, motivated by the sample of resonant chains coupled with dynamical sculpting, naturally generates uniformity in orbital period spacing similar to what is observed. Finally, we find that almost all collisions lead to perfect mergers, but some form of post-instability damping is likely needed to fully account for the present-day dynamically cold architectures of sub-Jovian exoplanets.

arXiv comment14 pages, 8 figures, accepted for publication in AJ

References in corpus (64)

• Planet Occurrence within 0.25 AU of Solar-type Stars from Kepler
• The false positive rate of Kepler and the occurrence of planets
• Planetary Candidates Observed by Kepler, III: Analysis of the First 16 Months of Data
• Prevalence of Earth-size planets orbiting Sun-like stars
• DHP Framework: Digital Health Passports Using Blockchain -- Use case on international tourism during the COVID-19 pandemic
• On detecting terrestrial planets with timing of giant planet transits
• Architecture of Kepler's Multi-transiting Systems: II. New investigations with twice as many candidates
• Probabilistic Forecasting of the Masses and Radii of Other Worlds
• Separating gas-giant and ice-giant planets by halting pebble accretion
• Planetary Candidates Observed by Kepler. VIII. A Fully Automated Catalog With Measured Completeness and Reliability Based on Data Release 25
• Collisions between Gravity-Dominated Bodies: 2. The Diversity of Impact Outcomes during the End Stage of Planet Formation
• Collisions Between Gravity-Dominated Bodies: 1. Outcome Regimes and Scaling Laws
• Breaking the Chains: Hot Super-Earth systems from migration and disruption of compact resonant chains
• Migration and the formation of systems of hot super-Earths and Neptunes
• Statistical Study of the Early Solar System's Instability with 4, 5 and 6 Giant Planets
• A seven-planet resonant chain in TRAPPIST-1
• Extracting Planet Mass and Eccentricity From TTV data
• The California-Kepler Survey V. Peas in a Pod: Planets in a Kepler Multi-planet System are Similar in Size and Regularly Spaced
• The California-Kepler Survey. I. High Resolution Spectroscopy of 1305 Stars Hosting Kepler Transiting Planets
• The orbital eccentricity of small planet systems
• Densities and Eccentricities of 139 Kepler Planets from Transit Time Variations
• Three-dimensional simulations of multiple protoplanets embedded in a protostellar disc
• Exoplanet Orbital Eccentricities Derived From LAMOST-Kepler Analysis
• Dissipative Divergence of Resonant Orbits
• A resonant chain of four transiting, sub-Neptune planets
• Kepler Planet Masses and Eccentricities from TTV Analysis
• Overstable Librations can account for the Paucity of Mean Motion Resonances among Exoplanet Pairs
• Resonant Repulsion of Kepler Planet Pairs
• Six transiting planets and a chain of Laplace resonances in TOI-178
• N-body simulations of planetary accretion around M dwarf stars
• Kepler Multi-Planet Systems Exhibit Unexpected Intra-system Uniformity in Mass and Radius
• Hybrid Symplectic Integrators for Planetary Dynamics
• Secure TTV Mass Measurements: Ten Kepler Exoplanets between 3 and 8 Earth Masses with Diverse Densities and Incident Fluxes
• Jupiter's Decisive Role in the Inner Solar System's Early Evolution
• A Dynamical Analysis of the Kepler-80 System of Five Transiting Planets
• Gas giant planets as dynamical barriers to inward-migrating super-Earths
• A reassessment of the in situ formation of close-in super-Earths
• Characterizing the Orbital Eccentricities of Transiting Extrasolar Planets with Photometric Observations
• Predicting the long-term stability of compact multiplanet systems
• Occurrence and core-envelope structure of 1--4x Earth-size planets around Sun-like stars
• Architectures of Exoplanetary Systems. III: Eccentricity and Mutual Inclination Distributions of AMD-stable Planetary Systems
• Correlations between compositions and orbits established by the giant impact era of planet formation
• Accounting for Incompleteness due to Transit Multiplicity in Kepler Planet Occurrence Rates
• On the evolution of mean motion resonances through stochastic forcing: Fast and slow libration modes and the origin of HD128311
• The statistical mechanics of planet orbits
• Tidally-Induced Radius Inflation of Sub-Neptunes
• Fitting random stable solar systems to Titius-Bode laws
• Spin-orbit Misalignment as a Driver of the Kepler Dichotomy
• The Laplace resonance in the Kepler-60 system
• The K2-138 System: A Near-Resonant Chain of Five Sub-Neptune Planets Discovered by Citizen Scientists
• CKS VIII: Eccentricities of Kepler Planets and Tentative Evidence of a High Metallicity Preference for Small Eccentric Planets
• An information theoretic framework for classifying exoplanetary system architectures
• An Analytic Criterion for Turbulent Disruption of Planetary Resonances
• Breaking Resonant Chains: Destabilization of Resonant Planets due to Long-term Mass Evolution
• Formation of compact systems of super-Earths via dynamical instabilities and giant impacts
• The role of dissipative evolution for three-planet, near-resonant extrasolar systems
• The "Breaking The Chains" migration model for super-Earths formation: the effect of collisional fragmentation
• Formation of Close-in Super-Earths by Giant Impacts: Effects of Initial Eccentricities and Inclinations of Protoplanets
• How Close are Compact Multi-Planet Systems to the Stability Limit?
• A Tidal Origin for a 3-body Resonance in Kepler-221
• The resilience of Kepler systems to stellar obliquity
• The origins of nearly coplanar, non-resonant systems of close-in super-Earths
• The role of disc torques in forming resonant planetary systems
• The distribution of mutual inclinations arising from the stellar quadrupole moment

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• A Criterion for the Stability of Planets in Chains of Resonances
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• Enhanced Size Uniformity for Near-resonant Planets
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• Breaking long-period resonance chains with stellar flybys
• Plausibility of Capture into High-Obliquity States for Exoplanets in the M Dwarf Habitable Zone
• Earth-like planets hosting systems: Architecture and properties
• Planets similar in size are often dissimilar in interior
• Tidally Heated Sub-Neptunes, Refined Planetary Compositions, and Confirmation of a Third Planet in the TOI-1266 System
• Close-in compact super-Earth systems emerging from resonant chains: slow destabilization by unseen remnants of formation
• The GAPS Programme at TNG. LIX. A characterisation study of the $\sim$300 Myr old multi-planetary system orbiting the star BD+40 2790 (TOI-2076)
• Higher-Order Mean-Motion Resonances Can Form in Type-I Disk Migration
• Callisto's Nonresonant Orbit as an Outcome of Circum-Jovian Disk Substructure
• Mass Derivation of planets K2-21b and K2-21c from Transit Timing Variations
• Orbital stability of compact three-planet systems III. The role of three-body resonances
• On the Ordering of Exoplanet Systems