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CONTEXT: Thermal emission from extrasolar planets makes it possible to studyimportant physical processes in their atmospheres and derive more preciseorbital elements. AIMS: By using new near infrared and optical data, we examinehow these data constrain the orbital eccentricity and the thermal properties ofthe planet atmosphere. METHODS: The full light curves acquired by the TESSsatellite from two sectors are used to put upper limit on the amplitude of theplanet's phase variation and estimate the occultation depth. Two, alreadypublished and one, yet unpublished followup observations in the 2MASS K (Ks)band are employed to derive a more precise occultation light curve in this nearinfrared waveband. RESULTS: The merged occultation light curve in the Ks bandcomprises 4515 data points. The data confirm the results of the earliereccentricity estimates, suggesting circular orbit: e=0.005+/-0.015. The highvalue of the flux depression of (2.70+/-0.14) ppt in the Ks band excludessimple black body emission at the 10 sigma level and disagrees also withcurrent atmospheric models at the (4-7) sigma level. From the analysis of theTESS data, in the visual band we found tentative evidence for a near noiselevel detection of the secondary eclipse, and placed constraints on theassociated amplitude of the planet's phase variation. A formal box fit yieldsan occultation depth of (0.157+/-0.056) ppt. This implies a relatively highgeometric albedo of Ag=0.43+/-0.15 for fully efficient atmospheric circulationand Ag=0.29+/-0.15 for no circulation at all. No preference can be seen eitherfor the oxygen-enhanced, or for the carbon-enhanced atmosphere models.

Near infrared and optical emission of WASP-5 b