Resolving Close Encounters: Stability in the HD 5319 and HD 7924 Planetary Systems
arXiv:1608.02590 · doi:10.3847/0004-637X/830/2/105
Abstract
Radial velocity searches for exoplanets have detected many multi-planet systems around nearby bright stars. An advantage of this technique is that it generally samples the orbit outside of inferior/superior conjunction, potentially allowing the Keplerian elements of eccentricity and argument of periastron to be well characterized. The orbital architectures for some of these systems show signs of close planetary encounters that may render the systems unstable as described. We provide an in-depth analysis of two such systems: HD 5319 and HD 7924, for which the scenario of coplanar orbits results in rapid destabilization of the systems. The poorly constrained periastron arguments of the outer planets in these systems further emphasizes the need for detailed investigations. An exhaustive scan of parameters space via dynamical simulations reveals specific mutual inclinations between the two outer planets in each system that allow for stable configurations over long timescales. We compare these configurations with those presented by mean-motion resonance as possible stability sources. Finally, we discuss the relevance to interpretation of multi-planet Keplerian orbits and suggest additional observations that will help to resolve the system stabilities.
arXiv comment10 pages, 5 figures, 1 table, accepted for publication in the Astrophysical Journal
References in corpus (20)
- Astrometric exoplanet detection with Gaia
- Science performance of Gaia, ESA's space-astrometry mission
- Overstable Librations can account for the Paucity of Mean Motion Resonances among Exoplanet Pairs
- Efficient fitting of multiplanet Keplerian models to radial velocity and astrometry data
- The Gaia astrophysical parameters inference system (Apsis). Pre-launch description
- Stability Limits in Extra-solar Planetary Systems
- Planets Near Mean-Motion Resonances
- The NASA-UC Eta-Earth Program: I. A Super-Earth Orbiting HD 7924
- Refining Exoplanet Ephemerides and Transit Observing Strategies
- Stability Limits in Resonant Planetary Systems
- Three Super-Earths Orbiting HD 7924
- Adaptive Scheduling Algorithms for Planet Searches
- Newly-Discovered Planets Orbiting HD~5319, HD~11506, HD~75784 and HD~10442 from the N2K Consortium
- Resonant periodic orbits in the exoplanetary systems
- Orbital Dynamics of Multi-Planet Systems with Eccentricity Diversity
- Behavior of Apsidal Orientations in Planetary Systems
- Long-lived Chaotic Orbital Evolution of Exoplanets in Mean Motion Resonances with Mutual Inclinations
- A High Eccentricity Component in the Double Planet System Around HD 163607 and a Planet Around HD 164509
- Two Jovian-Mass Planets in Earthlike Orbits
- On the Inclination and Habitability of the HD 10180 System
Cited by in corpus (7)
- Eccentricity Driven Climate Effects in the Kepler-1649 System
- Orbital Stability and Precession Effects in the Kepler-89 System
- Prospecting for exo-Earths in multiple planet systems with a gas giant
- The HD 181433 Planetary System: Dynamics and a New Orbital Solution
- TOI-712: a system of adolescent mini-Neptunes extending to the habitable zone
- TESS discovery of a super-Earth and two sub-Neptunes orbiting the bright, nearby, Sun-like star HD 22946
- The TESS-Keck Survey. XIX. A Warm Transiting Sub-Saturn Mass Planet and a non-Transiting Saturn Mass Planet Orbiting a Solar Analog