An extremely high photometric precision in ground-based observations of two transits in the WASP-50 planetary system

Abstract

We present photometric observations of two transits in the WASP-50 planetary system, obtained using the ESO New Technology Telescope and the defocussed-photometry technique. The rms scatters for the two datasets are 258 and 211\,ppm with a cadence of 170 to 200\,s, setting a new record for ground-based photometric observations of a point source. The data were modelled and fitted using the \textsc{prism} and \textsc{gemc} codes, and the physical properties of the system calculated. We find the mass and radius of the hot star to be $0.861\pm 0.057\Msun$ and $0.855\pm0.019\Rsun$, respectively. For the planet we find a mass of $1.437\pm 0.068\Mjup$, a radius of $1.138\pm0.026\Rjup$ and a density of $0.911\pm0.033\pjup$. These values are consistent with but more precise than those found in the literature. We also obtain a new orbital ephemeris for the system: $T_0=BJD/TDB2455558.61237(20)+1.9550938(13)\times E$.

6 Pages, 5 Figures, MNRAS Accepted 5/2/13

References in corpus (9)

• Homogeneous studies of transiting extrasolar planets. I. Light curve analyses
• The Transit Light Curve Project. V. System Parameters and Stellar Rotation Period of HD 189733
• Homogeneous studies of transiting extrasolar planets. II. Physical properties
• Transits and starspots in the WASP-19 planetary system
• The Transit Light Curve Project. VII. The Not-So-Bloated Exoplanet HAT-P-1b
• A Smaller Radius for the Transiting Exoplanet WASP-10b
• Characterization of the hot Neptune GJ 436b with Spitzer and ground-based observations
• The Transit Light Curve Project. XI. Submillimagnitude Photometry of Two Transits of the Bloated Planet WASP-4b
• Improved parameters for the transiting planet HD 17156b: a high-density giant planet with a very eccentric orbit

Cited by in corpus (22)

• Probabilistic Forecasting of the Masses and Radii of Other Worlds
• TESS Transit Timing of Hundreds of Hot Jupiters
• Towards Space-like Photometric Precision from the Ground with Beam-Shaping Diffusers
• Long Term Photometric Variability in Kepler Full Frame Images: Magnetic Cycles of Sun-Like Stars
• A comparison of gyrochronological and isochronal age estimates for transiting exoplanet host stars
• Transits and starspots in the WASP-6 planetary system
• Discrepancies between isochrone fitting and gyrochronology for exoplanet host stars?
• The blue sky of GJ3470b: the atmosphere of a low-mass planet unveiled by ground-based photometry
• ExoClock project II: A large-scale integrated study with 180 updated exoplanet ephemerides
• Transit timing variations in the WASP-4 planetary system
• Simultaneous follow-up of planetary transits: revised physical properties for the planetary systems HAT-P-16 and WASP-21
• ExoClock Project: An open platform for monitoring the ephemerides of Ariel targets with contributions from the public
• High-precision photometry by telescope defocussing. V. WASP-15 and WASP-16
• Peculiar architectures for the WASP-53 and WASP-81 planet-hosting systems
• Precision Astronomy with Imperfect Fully Depleted CCDs -- An Introduction and a Suggested Lexicon
• Possible detection of a bimodal cloud distribution in the atmosphere of HAT-P-32\,A\,b from multi-band photometry
• Precise Astronomical Flux Calibration and its Impact on Studying the Nature of Dark Energy
• The Large Array Survey Telescope -- Science Goals
• Constraints on TESS albedos for five hot Jupiters
• HD 76920b pinned down: a detailed analysis of the most eccentric planetary system around an evolved star
• Looking For Timing Variations in the Transits of 16 Exoplanets
• Characteristics of Kepler Eclipsing Binaries Displaying a Significant O'Connell Effect