A Holistic and Probabilistic Approach to the Ground-based and Spaceborne Data of HAT-P-19 System

Baştürk, Özgür; Yalçınkaya, S; Esmer, E M; Tanrıverdi, T; Mancini, L; Daylan, T; Southworth, John; Keten, B

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 broadband photometry, and Gaia parallax. We collected 65 light curves by amateur and professional observers, measured mid-transit times, analyzed their differences from calculated transit timings based on reference ephemeris information, which we update as a result. We haven’t 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 seventy transiting Saturn-mass planets from the NASA Exoplanet Archive.

• Journal Article Type: Article
• Acceptance Date: Jun 11, 2020
• Online Publication Date: Jun 20, 2020
• Publication Date: 2020-08
• Journal: Monthly Notices of the Royal Astronomical Society
• Print ISSN: 0035-8711
• Publisher: Oxford University Press
• Peer Reviewed: Peer Reviewed
• Volume: 496
• Issue: 4
• Pages: 4174-4190
• DOI: https://doi.org/10.1093/mnras/staa1758
• Keywords: planets and satellites: individual: HAT-P-19 b, planetary systems, methods: observational, techniques: photometric, techniques: spectroscopic, techniques : timing, stars: individual: HAT-P-19
• Publisher URL: https://doi.org/10.1093/mnras/staa1758