Multiple mean motion resonances in the HR 8799 planetary system

Abstract

HR 8799 is a nearby star hosting at least four ~10 Jovian mass planets in wide orbits up to ~70au, detected through the direct, high-contrast infrared imaging. Large companions and debris disks reported interior to ~10au, and exterior to ~100au indicate massive protoplanetary disc in the past. The dynamical state of the HR 8799 system is not yet fully resolved, due to limited astrometric data covering tiny orbital arcs. We construct a new, orbital model of the HR 8799 system, assuming rapid migration of the planets after their formation in wider orbits. We found that the HR 8799 planets are likely involved in double Laplace resonance, 1e:2d:4c:8b MMR. Quasi-circular planetary orbits are coplanar with the stellar equator and inclined by ~25 degrees to the sky plane. This best-fit orbital configuration matches astrometry, debris disk models, and mass estimates from cooling models. The multiple MMR is stable for the age of the star ~160Myr, for at least 1 Gyr unless significant perturbations to the N-body dynamics are present. We predict four configurations with the fifth hypothetical innermost planet HR 8799f in ~9.7au, or ~7.5au orbit, extending the MMR chain to triple Laplace resonance 1f:2e:4d:8c:16b MMR or to the 1f:3e:6d:12c:24b MMR, respectively. Our findings may establish strong boundary conditions for the system formation and its early history.

32 pages, 27 figures, 14 tables, acceptedto MNRAS

References in corpus (8)

• Direct Imaging of Multiple Planets Orbiting the Star HR 8799
• Dynamical Outcomes of Planet-Planet Scattering
• Spitzer IRS Spectroscopy of IRAS-Discovered Debris Disks
• Observed Properties of Extrasolar Planets
• HST/NICMOS detection of HR 8799 b in 1998
• Resolved Imaging of the HR 8799 Debris Disk with Herschel
• The long-term stability of extrasolar system HD 37124. Numerical study of resonance effects
• A linear distribution of orbits in compact planetary systems?

Cited by in corpus (61)

• First Results from High Angular Resolution ALMA Observations Toward the HL Tau Region
• The Occurrence and Architecture of Exoplanetary Systems
• The Subaru Coronagraphic Extreme Adaptive Optics system: enabling high-contrast imaging on solar-system scales
• Imaging Extrasolar Giant Planets
• Debris Disks: Structure, Composition, and Variability
• A resonant chain of four transiting, sub-Neptune planets
• First light of the VLT planet finder SPHERE. III. New spectrophotometry and astrometry of the HR8799 exoplanetary system
• Dynamical Constraints on the HR 8799 Planets with GPI
• The Anglo-Australian Planet Search XXIV: The Frequency of Jupiter Analogs
• Reconnaissance of the HR 8799 Exosolar System II: Astrometry and Orbital Motion
• Towards a population synthesis model of self-gravitating disc fragmentation and tidal downsizing II: The effect of fragment-fragment interactions
• Resolving the Planetesimal Belt of HR 8799 with ALMA
• Astrometric Monitoring of the HR 8799 Planets: Orbit Constraints from Self-Consistent Measurements
• VLT/SPHERE robust astrometry of the HR8799 planets at milliarcsecond-level accuracy Orbital architecture analysis with PyAstrOFit
• First versus second generation planet formation in post common envelope binary (PCEB) planetary systems
• The Laplace resonance in the Kepler-60 system
• Deep Thermal Infrared Imaging of HR 8799 bcde: New Atmospheric Constraints and Limits on a Fifth Planet
• The HU Aqr planetary system hypothesis revisited
• How to design a planetary system for different scattering outcomes: giant impact sweet spot, maximising exocomets, scattered disks
• Debris Distribution in HD 95086 - A Young Analog of HR 8799
• The LEECH Exoplanet Imaging Survey. Further constraints on the planet architecture of the HR 8799 system
• Solar System Physics for Exoplanet Research
• A search for a 5th planet around HR 8799 using the star-hopping RDI technique at VLT/SPHERE
• Predicting a third planet in the Kepler-47 circumbinary system
• The unseen planets of double belt debris disk systems
• Planetary migration and the origin of the 2:1 and 3:2 (near)-resonant population of close-in exoplanets
• The Dynamical Fate of Self-Gravitating Disc Fragments After Tidal Downsizing
• The Scattered Disc of HR 8799
• Constraints on the architecture of the HD 95086 planetary system with the Gemini Planet Imager
• Orbital Stability of Multi-Planet Systems: Behavior at High Masses
• Constraining the orbits of sub-stellar companions imaged over short orbital arcs
• An exact, generalised Laplace resonance in the HR 8799 planetary system
• Resolved Millimeter Observations of the HR 8799 Debris Disk
• The Reversibility Error Method (REM): a new, dynamical fast indicator for planetary dynamics
• Tidal circularization of gaseous planets orbiting white dwarfs
• Fly-by encounters between two planetary systems II: Exploring the interactions of diverse planetary system architectures
• A fast method to identify mean motion resonances
• The orbital architecture and debris disks of the HR 8799 planetary system
• Long-term stability of the HR 8799 planetary system without resonant lock
• Dynamical Mass of the Exoplanet Host Star HR 8799
• Dynamical models to explain observations with SPHERE in planetary systems with double debris belts
• The Separation and H-alpha Contrasts of Massive Accreting Planets in the Gaps of Transitional Disks: Predicted H-alpha Protoplanet Yields for Adaptive Optics Surveys
• Deep orbital search for additional planets in the HR 8799 system
• Precise radial velocities of giant stars. XI. Two brown dwarfs in 6:1 mean motion resonance around the K giant star $\nu$ Ophiuchi
• Constraining the presence of giant planets in two-belt debris disk systems with VLT/SPHERE direct imaging and dynamical arguments
• The origin and 9:7 MMR dynamics of the Kepler-29 system
• Modelling the Inner Debris Disc of HR 8799
• Shaping HR8799's outer dust belt with an unseen planet
• Migration of accreting planets in radiative discs from dynamical torques
• The GALAH Survey: Lithium-strong KM dwarfs
• The compositions of the HR 8799 planets reflect accretion of both solids and metal-enriched gas
• The post-main-sequence fate of the HR 8799 planetary system
• The dynamical structure of HR 8799's inner debris disk
• Re-analysing the dynamical stability of the HD 47366 planetary system
• Migration jumps of planets in transition disks
• PACOME: Optimal multi-epoch combination of direct imaging observations for joint exoplanet detection and orbit estimation
• Enrichment of the HR 8799 planets by minor bodies and dust
• Architecture of planetary systems predicted from protoplanetary disks observed with ALMA II: evolution outcomes and dynamical stability
• Towards a dynamics-based estimate of the extent of HR 8799's unresolved warm debris belt
• Longterm Stability of Planetary Systems formed from a Transitional Disk
• The Dynamical Environment of Kepler-223 Planetary System