The Transit Light Curve Project. XI. Submillimagnitude Photometry of Two Transits of the Bloated Planet WASP-4b

Abstract

We present photometry of two transits of the giant planet WASP-4b with a photometric precision of 400-800 parts per million and a time sampling of 25-40 seconds. The two midtransit times are determined to within 6 seconds. Together with previously published times, the data are consistent with a constant orbital period, giving no compelling evidence for period variations that would be produced by a satellite or additional planets. Analysis of the new photometry, in combination with stellar-evolutionary modeling, gives a planetary mass and radius of 1.237 +/- 0.064 M_jup and 1.365 +/- 0.021 R_jup. The planet is 15% larger than expected based on previously published models of solar-composition giant planets. With data of the quality presented here, the detection of transits of a "super-Earth" of radius 1.75 R_earth would have been possible.

arXiv commentTo appear in AJ [18 pages]

References in corpus (27)

• Evolutionary tracks and isochrones for low- and intermediate-mass stars: from 0.15 to 7 M_sun, and from Z=0.0004 to 0.03
• Analytic Lightcurves for Planetary Transit Searches
• Planetary Radii across Five Orders of Magnitude in Mass and Stellar Insolation: Application to Transits
• On the Unique Solution of Planet and Star Parameters from an Extrasolar Planet Transit Light Curve
• Towards Better Age Estimates for Stellar Populations: The Y^2 Isochrones for Solar Mixture
• DHP Framework: Digital Health Passports Using Blockchain -- Use case on international tourism during the COVID-19 pandemic
• On detecting terrestrial planets with timing of giant planet transits
• Atmospheric Circulation and Tides of "51Peg b-like" Planets
• Improved parameters for extrasolar transiting planets
• Tidal Decay of Close Planetary Orbits
• Tidal Evolution of Close-in Extra-Solar Planets
• Evolution of "51Peg b-like" Planets
• Possible Solutions to the Radius Anomalies of Transiting Giant Planets
• Homogeneous studies of transiting extrasolar planets. I. Light curve analyses
• Improving Stellar and Planetary Parameters of Transiting Planet Systems: The Case of TrES-2
• The Transit Light Curve Project. IX. Evidence for a Smaller Radius of the Exoplanet XO-3b
• On the Radii of Extrasolar Giant Planets
• The Transit Light Curve (TLC) Project. I. Four Consecutive Transits of the Exoplanet XO-1b
• Heat transport in giant (exo)planets: a new perspective
• The Transit Light Curve Project. V. System Parameters and Stellar Rotation Period of HD 189733
• Analytic Approximations for Transit Light Curve Observables, Uncertainties, and Covariances
• A Theory for the Radius of the Transiting Giant Planet HD 209458b
• WASP-4b: a 12th-magnitude transiting hot-Jupiter in the Southern hemisphere
• Properties of analytic transit light curve models
• The New Transiting Planet OGLE-TR-56b: Orbit and Atmosphere
• The composition of transiting giant extrasolar planets
• Theoretical Radii of Extrasolar Giant Planets: the Cases of TrES-4, XO-3b, and HAT-P-1b

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