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.
@article{arxiv.1610.09533,
title = {Absolute densities, masses, and radii of the WASP-47 system determined dynamically},
author = {J. M. Almenara and R. F. Díaz and X. Bonfils and S. Udry},
journal= {arXiv preprint arXiv:1610.09533},
year = {2016}
}
Comments
11 pages, 7 figures, accepted for publication in A&A