A holistic and probabilistic approach to the ground-based and spaceborne data of HAT-P-19 system

• Published in: Monthly notices of the Royal Astronomical Society 2020-08, Vol.496 (4), p.4174-4190
• Main Authors: Baştürk, Özgür, Yalçınkaya, S, Esmer, E M, Tanrıverdi, T, Mancini, L, Daylan, T, Southworth, J, Keten, B
• Format: Article
• Language: English
• ISSN: 0035-8711; 1365-2966
• DOI: 10.1093/mnras/staa1758

ABSTRACT We update the main physical and orbital properties of the transiting hot Saturn planet HAT-P-19 b, based on a global modelling of high-precision transit and occultation light curves, taken with ground-based and space telescopes, archive spectra and radial velocity measurements, brightness values from broad-band photometry, and Gaia parallax. We collected 65 light curves by amateur and professional observers, measured mid-transit times, and analysed their differences from calculated transit timings based on reference ephemeris information, which we update as a result. We have not found any periodicity in the residuals of a linear trend, which we attribute to the accumulation of uncertainties in the reference mid-transit time and the orbital period. We comment on the scenarios describing the formation and migration of this hot-Saturn type exoplanet with a bloated atmosphere yet a small core, although it is orbiting a metal-rich ([Fe/H] = 0.24 dex) host star. Finally, we review the planetary mass–radius, the orbital period–radius, and density, and the stellar metallicity–core mass diagrams, based on the parameters we derive for HAT-P-19 b and those of the other 70 transiting Saturn-mass planets from the NASA Exoplanet Archive.