The phase curve and the geometric albedo of WASP-43b measured with CHEOPS, TESS and HST WFC3/UVIS

Abstract

Observations of the phase curves and secondary eclipses of extrasolar planets provide a window on the composition and thermal structure of the planetary atmospheres. For example, the photometric observations of secondary eclipses lead to the measurement of the planetary geometric albedo $A_g$, which is an indicator of the presence of clouds in the atmosphere. In this work we aim to measure the $A_g$ in the optical domain of WASP-43b, a moderately irradiated giant planet with an equilibrium temperature of $\sim$1400~K. To this purpose, we analyze the secondary eclipse light curves collected by CHEOPS, together with TESS observations of the system and the publicly available photometry obtained with HST WFC3/UVIS. We also analyze the archival infrared observations of the eclipses and retrieve the thermal emission spectrum of the planet. By extrapolating the thermal spectrum to the optical bands, we correct the optical eclipses for thermal emission and derive the optical $A_g$. The fit of the optical data leads to a marginal detection of the phase curve signal, characterized by an amplitude of $160\pm 60$~ppm and 80${}_{-50}^{+60}$~ppm in the CHEOPS and TESS passband respectively, with an eastward phase shift of $\sim 50^{\circ }$ (1.5$\sigma$ detection). The analysis of the infrared data suggests a non-inverted thermal profile and solar-like metallicity. The combination of optical and infrared analysis allows us to derive an upper limit for the optical albedo of $A_g<0.087$ with a confidence of 99.9\%. Our analysis of the atmosphere of WASP-43b places this planet in the sample of irradiated hot Jupiters, with monotonic temperature-pressure profile and no indication of condensation of reflective clouds on the planetary dayside.

References in corpus (41)

• A grid of MARCS model atmospheres for late-type stars I. Methods and general properties
• The generalised Lomb-Scargle periodogram. A new formalism for the floating-mean and Keplerian periodograms
• Gaia Early Data Release 3: Parallax bias versus magnitude, colour, and position
• The effect of red noise on planetary transit detection
• A Precise Water Abundance Measurement for the Hot Jupiter WASP-43b
• Thermal structure of an exoplanet atmosphere from phase-resolved emission spectroscopy
• Precision Stellar Characterization of FGKM Stars using an Empirical Spectral Library
• The CHEOPS mission
• CLES, Code Liegeois d'Evolution Stellaire
• Determining stellar macroturbulence using asteroseismic rotational velocities from Kepler
• Changing Phases of Alien Worlds: Probing Atmospheres of Kepler Planets with High-Precision Photometry
• Spitzer Phase Curve Constraints for WASP-43b at 3.6 and 4.5 microns
• The Atmospheric Circulation of the Hot Jupiter WASP-43b: Comparing Three-Dimensional Models to Spectrophotometric Data
• New Analysis Indicates No Thermal Inversion in the Atmosphere of HD 209458b
• Balancing the Energy Budget of Short-Period Giant Planets: Evidence for Reflective Clouds and Optical Absorbers
• A method for the direct determination of the surface gravities of transiting extrasolar planets
• Revising the ages of planet-hosting stars
• The hot dayside and asymmetric transit of WASP-189b seen by CHEOPS
• Helios-r2 -- A new Bayesian, open-source retrieval model for brown dwarfs and exoplanet atmospheres
• CHEOPS observations of the HD 108236 planetary system: A fifth planet, improved ephemerides, and planetary radii
• A transition between the hot and the ultra-hot Jupiter atmospheres
• Systematic Phase Curve Study of Known Transiting Systems from Year 1 of the TESS Mission
• WASP-186 and WASP-187: two hot Jupiters discovered by SuperWASP and SOPHIE with additional observations by TESS
• The atmosphere and architecture of WASP-189 b probed by its CHEOPS phase curve
• Visible-light Phase Curves from the Second Year of the TESS Primary Mission
• Cloud property trends in hot and ultra-hot giant gas planets (WASP-43b, WASP-103b, WASP-121b, HAT-P-7b, and WASP-18b)
• A pair of Sub-Neptunes transiting the bright K-dwarf TOI-1064 characterised with CHEOPS
• Reinvestigating $\alpha$ Cen AB in light of asteroseismic forward and inverse methods
• CHEOPS Precision Phase Curve of the Super-Earth 55 Cnc e
• Spi-OPS: Spitzer and CHEOPS confirm the near-polar orbit of MASCARA-1 b and reveal a hint of dayside reflection
• Mineral cloud and hydrocarbon haze particles in the atmosphere of the hot Jupiter JWST target WASP-43b
• Black Mirror: The impact of rotational broadening on the search for reflected light from 51 Pegasi b with high resolution spectroscopy
• ACCESS: A Visual to Near-infrared Spectrum of the Hot Jupiter WASP-43b with Evidence of ${\mathrm{H}}_2\mathrm{O}$, but no evidence of Na or K
• The TOI-763 system: sub-Neptunes orbiting a Sun-like star
• The Dark World: A Tale of WASP-43b in Reflected Light with HST WFC3/UVIS
• The GAPS Programme at TNG. XXIX. No detection of reflected light from 51 Peg b using optical high-resolution spectroscopy
• An eclipsing M-dwarf close to the hydrogen burning limit from NGTS
• Probing Kepler's hottest small planets via homogeneous search and analysis of optical secondary eclipses and phase variations
• Is the orbit of the exoplanet WASP-43b really decaying? TESS and MuSCAT2 observations confirm no detection
• Constraints on TESS albedos for five hot Jupiters
• The Emission Spectrum of the Hot Jupiter WASP-79b from HST/WFC3

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• Retrieval of the dayside atmosphere of WASP-43b with CRIRES+
• Characterizing WASP-43b's interior structure: unveiling tidal decay and apsidal motion
• The apparent tidal decay of WASP-4 b can be explained by the Rømer effect
• The GAPS Programme at TNG. XXX: Characterization of the low-density gas giant HAT-P-67 b with GIARPS
• Dark skies of the slightly eccentric WASP-18 b from its optical-to-infrared dayside emission
• Planet-star interactions with precise transit timing. IV. Probing the regime of dynamical tides for GK host stars
• Lessons from Hubble and Spitzer: 1D Self-Consistent Model Grids for 19 Hot Jupiter Emission Spectra
• The CHEOPS view on the climate of WASP-3 b
• An Analytical Model of Wavelength-dependent Opposition Surge in Emittance and Reflectance Spectroscopy of Airless Rocky Exoplanets
• The dark days are overcast: Iron-bearing clouds on HD 209458 b and WASP-43 b can explain low dayside albedos