Absolute densities, masses, and radii of the WASP-47 system determined dynamically

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.

11 pages, 7 figures, accepted for publication in A&A

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• 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
• Revisiting WASP-47 with ESPRESSO and TESS
• A close outer companion to the ultra-hot Jupiter TOI-2109 b?
• HyDRo: Atmospheric Retrieval of Rocky Exoplanets in Thermal Emission