Characterising planets and their host stars in the Gaia era

Planets transiting nearby bright stars are amenable to precise characterisation through their light curves and radial velocity measurements, which allows their fundamental properties and atmospheric composition to be explored. By including Gaia DR1 (and soon DR2) parallaxes, host star radii are directly measurable through spectral energy distributions (SEDs). Combining information from transit light curves, radial velocities, parallaxes and SEDs can be a challenging task given the complex and often correlated parameter space. I will present a new Gaussian-process based transiting planet model, GP-EBOP, which simultaneously models light curves and radial velocities, and combines information on the host star from the system’s SED and Gaia parallax. I will present GP-EBOP in the context of modelling the newly confirmed planets from the Next Generation Transit Survey (NGTS), which include the most massive planet known to transit an M-dwarf and the shortest period hot Jupiter.

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