A holistic and probabilistic approach to the ground-based and spaceborne data of HAT-P-19 system. Issue 4 (20th June 2020)

• Record Type: Journal Article
• Authors: Baştürk, Özgür; Yalçınkaya, S; Esmer, E M; Tanrıverdi, T; Mancini, L; Daylan, T; Southworth, J; Keten, B
• Is Part Of: Monthly notices of the Royal Astronomical Society. Volume 496:Issue 4(2020)
• Page Start: 4174
• Page End: 4190
• Publication Date: 2020-06-20
• Subjects: methods: observational -- techniques: photometric -- techniques: spectroscopic -- stars: individual: HAT-P-19; Astronomy -- Periodicals; Periodicals; 520.5
• DOI: 10.1093/mnras/staa1758
• Languages: English
• ISSNs: 0035-8711

Abstract

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.