Is the HR 8799 extrasolar system destined for planetary scattering?
arXiv:0904.4106 · doi:10.1111/j.1745-3933.2009.00674.x
Abstract
The recent discovery of a three-planet extrasolar system of HR 8799 by Marois et al. is a breakthrough in the field of the direct imaging. This great achievement raises questions on the formation and dynamical stability of the HR 8799 system, because Keplerian fits to astrometric data are strongly unstable during ~0.2Myr. We search for stable, self-consistent N-body orbits with the so called GAMP method that incorporates stability constraints into the optimization algorithm. Our searches reveal only small regions of stable motions in the phase space of three-planet, coplanar configurations. Most likely, if the planetary masses are in 10-Jupiter-mass range, they may be stable only if the planets are involved in two- or three-body mean motion resonances (MMRs). We found that 80% systems found by GAMP that survived 30Myr backwards integrations, eventually become unstable after 100Myr. It could mean that the HR 8799 system undergo a phase of planet-planet scattering. We test a hypothesis that the less certain detection of the innermost object is due to a blending effect. In such a case, two-planet best-fit systems are mostly stable, on quasi-circular orbits and close to the 5:2 MMR, resembling the Jupiter-Saturn pair.
5 pages, 8 figures, 1 table, accepted to the Monthly Notices of the Royal Astronomy Society Letters
References in corpus (3)
Cited by in corpus (45)
- Images of a fourth planet orbiting HR 8799
- Imaging Extrasolar Giant Planets
- Clouds and Chemistry in the Atmosphere of Extrasolar Planet HR8799b
- Masses, Radii, and Cloud Properties of the HR 8799 Planets
- The Debris Disk Around HR 8799
- Near-Infrared Spectroscopy of the Extrasolar Planet HR 8799 b
- The Formation Mechanism of Gas Giants on Wide Orbits
- Debris Disks: Seeing Dust, Thinking of Planetesimals and Planets
- Constraining the initial entropy of directly-detected exoplanets
- High Precision Dynamical Masses of Very Low Mass Binaries
- Reconnaissance of the HR 8799 Exosolar System I: Near IR Spectroscopy
- Three Body Resonance Overlap in Closely Spaced Multiple Planet Systems
- Atmospheric Retrieval Analysis of the Directly Imaged Exoplanet HR 8799b
- Reconnaissance of the HR 8799 Exosolar System II: Astrometry and Orbital Motion
- Resolved Imaging of the HR 8799 Debris Disk with Herschel
- Resolved Submillimeter Observations of the HR 8799 and HD 107146 Debris Disks
- The CHARA Array Angular Diameter of HR 8799 Favors Planetary Masses for Its Imaged Companions
- VLT/SPHERE exploration of the young multiplanetary system PDS70
- Multiple mean motion resonances in the HR 8799 planetary system
- VLT/SPHERE robust astrometry of the HR8799 planets at milliarcsecond-level accuracy Orbital architecture analysis with PyAstrOFit
- Observational Constraints on Companions inside of 10 AU in the HR 8799 Planetary System
- LBT observations of the HR 8799 planetary system: First detection of HR8799e in H band
- A possible architecture of the planetary system HR 8799
- Locating the planetesimals belts in the multiple-planet systems HD 128311, HD 202206, HD 82943 and HR 8799
- High-Mass, Four-Planet Models for HR 8799: Constraining the Orbital Inclination and Age of the System
- The LEECH Exoplanet Imaging Survey. Further constraints on the planet architecture of the HR 8799 system
- Solar System Physics for Exoplanet Research
- Could the planets around HR 8799 be brown dwarfs?
- A search for a 5th planet around HR 8799 using the star-hopping RDI technique at VLT/SPHERE
- Secular Orbital Dynamics of Hierarchical Two Planet Systems
- The Scattered Disc of HR 8799
- Limits on orbit crossing planetesimals in the resonant multiple planet system, KOI-730
- Effects of a planetesimal debris disk on stability scenarios for the extrasolar planetary system HR 8799
- A Search for Wide Companions to the Extrasolar Planetary System HR 8799
- Treating dynamical stability as an observable: a 5:2 MMR configuration for the extrasolar system HD 181433
- VLT/NACO astrometry of the HR8799 planetary system. L'-band observations of the three outer planets
- Capture of Irregular Satellites via Binary Planetesimal Exchange Reactions in Migrating Planetary Systems
- Application of chaos indicators in the study of dynamics of S-type extrasolar planets in stellar binaries
- The orbital architecture and debris disks of the HR 8799 planetary system
- Spatially resolved submm imaging of the HR 8799 debris disk
- Long-term stability of the HR 8799 planetary system without resonant lock
- Shaping HR8799's outer dust belt with an unseen planet
- On the Ages of Planetary Systems with Mean Motion Resonances
- The post-main-sequence fate of the HR 8799 planetary system
- Mechanic: the MPI/HDF code framework for dynamical astronomy