Strong Scatterings of Cold Jupiters and their Influence on Inner Low-mass Planet Systems: Theory and Simulations

Abstract

Recent observations have indicated a strong connection between compact ($a\lesssim 0.5$ au) super-Earth and mini-Neptune systems and their outer ($a\gtrsim$ a few au) giant planet companions. We study the dynamical evolution of such inner systems subject to the gravitational effect of an unstable system of outer giant planets, focussing on systems whose end configurations feature only a single remaining outer giant. In contrast to similar studies which used on N-body simulations with specific (and limited) parameters or scenarios, we implement a novel hybrid algorithm which combines N-body simulations with secular dynamics with aims of obtaining analytical understanding and scaling relations. We find that the dynamical evolution of the inner planet system depends crucially on $N_{\mathrm{ej}}$, the number of mutual close encounters between the outer planets prior to eventual ejection/merger. When $N_{\mathrm{ej}}$ is small, the eventual evolution of the inner planets can be well described by secular dynamics. For larger values of $N_{\mathrm{ej}}$, the inner planets gain orbital inclination, inclination and eccentricity in a stochastic fashion analogous to Brownian motion. We develop a theoretical model, and compute scaling laws for the final orbital parameters of the inner system. We show that our model can account for the observed eccentric super-Earths/mini-Neptunes with inclined cold Jupiter companions, such as HAT-P-11, Gliese 777 and $\pi$ Men.

arXiv commentaccepted for publication in MNRAS

References in corpus (47)

• REBOUND: An open-source multi-purpose N-body code for collisional dynamics
• Dynamical Outcomes of Planet-Planet Scattering
• IAS15: A fast, adaptive, high-order integrator for gravitational dynamics, accurate to machine precision over a billion orbits
• Dynamical Origin of Extrasolar Planet Eccentricity Distribution
• Origins of Eccentric Extrasolar Planets: Testing the Planet-Planet Scattering Model
• HAT-P-11b: A Super-Neptune Planet Transiting a Bright K Star in the Kepler Field
• Ten New and Updated Multi-planet Systems, and a Survey of Exoplanetary Systems
• About 30% of Sun-like Stars Have Kepler-like Planetary Systems: A Study of their Intrinsic Architecture
• Toward a Deterministic Model of Planetary Formation VII: Eccentricity Distribution of Gas Giants
• TESS Discovery of a Transiting Super-Earth in the $\pi$ Mensae System
• An Excess of Jupiter Analogs in Super-Earth Systems
• Post-Oligarchic Evolution of Protoplanetary Embryos and the Stability of Planetary Systems
• The Oblique Orbit of the Super-Neptune HAT-P-11b
• Scattering outcomes of close-in planets: constraints on planet migration
• The stability and fates of hierarchical two-planet systems
• The stability of tightly-packed, evenly-spaced systems of Earth-mass planets orbiting a Sun-like star
• HAT-P-11: Discovery of a Second Planet and a Clue to Understanding Exoplanet Obliquities
• The effects of external planets on inner systems: multiplicities, inclinations, and pathways to eccentric warm Jupiters
• Evidence for a high mutual inclination between the cold Jupiter and transiting super Earth orbiting $\pi$ Men
• Effects of Dynamical Evolution of Giant Planets on Survival of Terrestrial Planets
• Low-Eccentricity Migration of Ultra-Short Period Planets in Multi-Planet Systems
• Hiding Planets Behind a Big Friend: Mutual Inclinations of Multi-Planet Systems with External Companions
• Effects of Unseen Additional Planetary Perturbers on Compact Extrasolar Planetary Systems
• Compact planetary systems perturbed by an inclined companion: II. Stellar spin-orbit evolution
• Eccentricities and Inclinations of Multi-Planet Systems with External Perturbers
• A precise architecture characterization of the $\pi$ Men planetary system
• In-Situ Scattering of Warm Jupiters and Implications for Dynamical Histories
• Dynamically hot Super-Earths from outer giant planet scattering
• Compact planetary systems perturbed by an inclined companion: I. Vectorial representation of the secular model
• Perturbation of Compact Planetary Systems by Distant Giant Planets
• Efficient Geometric Probabilities of Multi-Transiting Exoplanetary Systems from CORBITS
• Dynamical Tides in Highly Eccentric Binaries: Chaos, Dissipation and Quasi-Steady State
• A significant mutual inclination between the planets within the $\pi$ Mensae system
• Mutual Orbital Inclinations Between Cold Jupiters and Inner Super-Earths
• Hidden Planetary Friends: On the Stability Of 2-Planet Systems in the Presence of a Distant, Inclined Companion
• Signatures of a planet-planet impacts phase in exoplanetary systems hosting giant planets
• Survival of habitable planets in unstable planetary systems
• Orbital misalignment of the super-Earth $\pi$ Men c with the spin of its star
• Outer-planet scattering can gently tilt an inner planetary system
• Survival of non-coplanar, closely-packed planetary systems after a close encounter
• Giant Planet Scatterings and Collisions: Hydrodynamics, Merger-Ejection Branching Ratio, and Properties of the Remnants
• Dynamical instability and its implications for planetary system architecture
• How do External Companions Affect Spin-Orbit Misalignment of Hot Jupiters?
• Teetering Stars: Resonant Excitation of Stellar Obliquities by Hot and Warm Jupiters with External Companions
• A Simple Random-Walk Model Explains the Disruption Process of Hierarchical, Eccentric 3-Body Systems
• Transit Probabilities in Secularly Evolving Planetary Systems
• Outer Architecture of Kepler-11: Constraints from Coplanarity

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• The HD 137496 system: A dense, hot super-Mercury and a cold Jupiter
• The distribution of mutual inclinations arising from the stellar quadrupole moment
• Inclination Dynamics of Resonant Planets under the Influence of an Inclined External Companion
• The Impact of Stellar Clustering on the Observed Multiplicity of Super-Earth systems: Outside-in Cascade of Orbital Misalignments Initiated by Stellar Flybys
• Spin Dynamics of Extrasolar Giant Planets in Planet-Planet Scattering
• Architecture of planetary systems predicted from protoplanetary disks observed with ALMA II: evolution outcomes and dynamical stability
• Dynamical Evolution of Planetary Systems