Journal
ASTRONOMY & ASTROPHYSICS
Volume 595, Issue -, Pages -Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361/201629770
Keywords
stars: individual: WASP-47; planetary systems; techniques: photometric; techniques: radial velocities
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Funding
- NASA Science Mission directorate
- European Research Council under the ERC Grant [337591-ExTrA]
- Swiss National Science Foundation (SNSF)
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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.
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