The atmospheres of the hot-Jupiters Kepler-5b and Kepler-6b observed during occultations with Warm-Spitzer and Kepler

Abstract

This paper reports the detection and the measurements of occultations of the two transiting hot giant exoplanets Kepler-5b and Kepler-6b by their parent stars. The observations are obtained in the near infrared with Spitzer Space Telescope and at optical wavelengths by combining more than a year of Kepler photometry. The investigation consists of constraining the eccentricities of these systems and of obtaining broad band emergent spectra for individual planets. For both targets, the occultations are detected at 3 sigma level at each wavelength with mid-occultation times consistent with circular orbits. The brightness temperatures of these planets are deduced from the infrared observations and reach T=1930+/-100K and T=1660+/-120K for Kepler-5b and Kepler-6b respectively. We measure optical geometric albedos A_g in the Kepler bandpass and find A_g=0.12+/-0.04 for Kepler-5b and A_g=0.11+/-0.04 for Kepler-6b leading to an upper limit for the Bond albedo of A_B < 0.17 in both cases. The observations for both planets are best described by models for which most of the incident energy is redistributed on the dayside, with only less than 10% of the absorbed stellar flux redistributed to the night side of these planets. The data for Kepler-5b favor a model without a temperature inversion, whereas for Kepler-6b they do not allow distinguishing between models with and without inversion.

26 pages, 18 figures, 3 tables, submitted to ApJ

References in corpus (20)

• Detection of Thermal Emission from an Extrasolar Planet
• The effect of red noise on planetary transit detection
• Line and Mean Opacities for Ultracool Dwarfs and Extrasolar Planets
• The climate of HD 189733b from fourteen transits and eclipses measured by Spitzer
• Atmospheric Sulfur Photochemistry on Hot Jupiters
• The Broadband Infrared Emission Spectrum of the Exoplanet HD 189733b
• Strong Water Absorption in the Dayside Emission Spectrum of the Planet HD 189733b
• Theoretical Spectra and Light Curves of Close-in Extrasolar Giant Planets and Comparison with Data
• Theoretical Spectral Models of the Planet HD 209458b with a Thermal Inversion and Water Emission Bands
• Atmospheric Circulation of Hot Jupiters: Three-dimensional circulation models of HD 209458b and HD 189733b with Simplified Forcing
• The Very Low Albedo of an Extrasolar Planet: MOST Spacebased Photometry of HD 209458
• Accurate Spitzer infrared radius measurement for the hot Neptune GJ 436b
• TiO and VO broad band absorption features in the optical spectrum of the atmosphere of the hot-Jupiter HD209458b
• Thermal Emission of Exoplanet XO-1b
• High accuracy transit photometry of the planet OGLE-TR-113b with a new deconvolution-based method
• Warm Spitzer Photometry of the Transiting Exoplanets CoRoT-1 and CoRoT-2 at Secondary Eclipse
• Thermal Emission from Transiting Very-Hot Jupiters: Prospects for Ground-based Detection at Optical Wavelengths
• Ground-based secondary eclipse detection of the very-hot Jupiter OGLE-TR-56b
• Atmosphere and Spectral Models of the Kepler-Field Planets HAT-P-7b and TrES-2
• Transit spectrophotometry of the exoplanet HD189733b. II. New Spitzer observations at 3.6 microns

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