Reanalysis of radial velocity data from the resonant planetary system HD128311
arXiv:1501.00980 · doi:10.1093/mnrasl/slu202
Abstract
The multi-planetary system HD128311 hosts at least two planets. Its dynamical formation history has been studied extensively in the literature. We reanalyse the latest radial velocity data for this system with the affine-invariant Markov chain Monte Carlo sampler EMCEE. Using the high order integrator IAS15, we perform a fully dynamical fit, allowing the planets to interact during the sampling process. A stability analysis using the MEGNO indicator reveals that the system is located in a stable island of the parameter space. In contrast to a previous study, we find that the system is locked in a 2:1 mean motion resonance. The resonant angle is librating with a libration amplitude of approximately 37°. The existence of mean motion resonances has important implication for planet formation theories. Our results confirm predictions of models involving planet migration and stochastic forces.
arXiv comment4 pages, 2 figures, accepted by MNRAS Letters
References in corpus (18)
- emcee: The MCMC Hammer
- REBOUND: An open-source multi-purpose N-body code for collisional dynamics
- IAS15: A fast, adaptive, high-order integrator for gravitational dynamics, accurate to machine precision over a billion orbits
- Planetary Migration and Extrasolar Planets in the 2/1 Mean-Motion Resonance
- Systemic: A Testbed For Characterizing the Detection of Extrasolar Planets. I. The Systemic Console Package
- Mean motion resonances from planet-planet scattering
- Influence of an inner disc on the orbital evolution of massive planets migrating in resonance
- Reducing the Probability of Capture into Resonance
- On the evolution of mean motion resonances through stochastic forcing: Fast and slow libration modes and the origin of HD128311
- Trojan pairs in the HD 128311 and HD 82943 planetary systems?
- An Affine-Invariant Sampler for Exoplanet Fitting and Discovery in Radial Velocity Data
- On the evolution of the resonant planetary system HD128311
- Stability and Formation of the Resonant System HD 73526
- Secondary resonances of co-orbital motions
- Dynamics of two planets in co-orbital motion
- On fitting planetary systems in counter-revolving configurations
- Planetary Migration and Eccentricity and Inclination Resonances in Extrasolar Planetary Systems
- Mean Motion Resonances in Extrasolar Planetary Systems with Turbulence, Interactions, and Damping
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- Special cases : moons, rings, comets, trojans