Absolute densities, masses, and radii of the WASP-47 system determined dynamically
arXiv:1610.09533 · doi:10.1051/0004-6361/201629770
Abstract
We present a self-consistent modelling of the available light curve and radial velocity data of WASP-47 that takes into account the gravitational interactions between all known bodies in the system. The joint analysis of light curve and radial velocity data in a multi-planetary system allows deriving absolute densities, radii, and masses without the use of theoretical stellar models. For WASP-47 the precision is limited by the reduced dynamical information that is due to the short time span of the K2 light curve. We achieve a precision of around 22% for the radii of the star and the transiting planets, between 40% and 60% for their masses, and between 1.5% and 38% for their densities. All values agree with previously reported measurements. When theoretical stellar models are included, the system parameters are determined with a precision that exceeds that achieved by previous studies, thanks to the self-consistent modelling of light curve and radial velocity data.
arXiv comment11 pages, 7 figures, accepted for publication in A&A
References in corpus (29)
- emcee: The MCMC Hammer
- Analytic Lightcurves for Planetary Transit Searches
- The Dartmouth Stellar Evolution Database
- The K2 Mission: Characterization and Early results
- Habitable Zones Around Main-Sequence Stars: New Estimates
- The PLATO 2.0 Mission
- REBOUND: An open-source multi-purpose N-body code for collisional dynamics
- Achieving better than 1 minute accuracy in the Heliocentric and Barycentric Julian Dates
- Efficient, uninformative sampling of limb darkening coefficients for two-parameter laws
- Most 1.6 Earth-Radius Planets are not Rocky
- WHFast: A fast and unbiased implementation of a symplectic Wisdom-Holman integrator for long term gravitational simulations
- Fundamental Properties of Kepler Planet-Candidate Host Stars using Asteroseismology
- Binning is sinning: morphological light-curve distortions due to finite integration time
- A spin-down clock for cool stars from observations of a 2.5-billion-year-old cluster
- WASP-47: A Hot Jupiter System with Two Additional Planets Discovered by K2
- CHEOPS: A Transit Photometry Mission for ESA's Small Mission Programme
- A Detailed Model Grid for Solid Planets from 0.1 through 100 Earth Masses
- The Exoplanet Orbit Database II: Updates to exoplanets.org
- Angular Momentum Loss from Cool Stars: An Empirical Expression and Connection to Stellar Activity
- Seven transiting hot-Jupiters from WASP-South, Euler and TRAPPIST: WASP-47b, WASP-55b, WASP-61b, WASP-62b, WASP-63b, WASP-66b & WASP-67b
- WASP-42 b and WASP-49 b: two new transiting sub-Jupiters
- New and updated stellar parameters for 90 transit hosts. The effect of the surface gravity
- Hot Jupiters with relatives: discovery of additional planets in orbit around WASP-41 and WASP-47
- Discrepancies between isochrone fitting and gyrochronology for exoplanet host stars?
- A low stellar obliquity for WASP-47, a compact multiplanet system with a hot Jupiter and an ultra-short period planet
- A Lucky Imaging search for stellar companions to transiting planet host stars
- Absolute masses and radii determination in multiplanetary systems without stellar models
- Doppler Monitoring of the WASP-47 Multiplanet System
- The SOPHIE search for northern extrasolar planets. XI. Three new companions and an orbit update: Giant planets in the habitable zone
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- Science Extraction from TESS Observations of Known Exoplanet Hosts
- A low-eccentricity migration pathway for a 13-h-period Earth analogue in a four-planet system
- A new dynamical modeling of the WASP-47 system with CHEOPS observations
- In situ formation of hot Jupiters with companion super-Earths
- DREAM: III.A helium survey in exoplanets on the edge of the hot Neptune desert with GIANO-B@TNG
- Probing Transit Timing Variation and its Possible Origin with Twelve New Transits of TrES-3b
- SOPHIE velocimetry of Kepler transit candidates XVIII. Radial velocity confirmation, absolute masses and radii, and origin of the Kepler-419 multiplanetary system
- Revisiting WASP-47 with ESPRESSO and TESS
- Transit Probabilities in Secularly Evolving Planetary Systems
- The Dark Planets of the WASP-47 Planetary System
- A close outer companion to the ultra-hot Jupiter TOI-2109 b?
- Models of radial velocities and transit light curves
- HyDRo: Atmospheric Retrieval of Rocky Exoplanets in Thermal Emission