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Constraints on TESS albedos for five hot Jupiters

Constraints on TESS albedos for five hot Jupiters Thumbnail


Photometric observations of occultations of transiting exoplanets can place important constraints on the thermal emission and albedos of their atmospheres. We analyse photometric measurements and derive geometric albedo (A(g)) constraints for five hot Jupiters observed with TESS in the optical: WASP-18 b, WASP-36 b, WASP-43 b, WASP-50 b, and WASP-51 b. For WASP-43 b, our results are complemented by a VLT/HAWK-I observation in the near-infrared at 2.09 mu m. We derive the first geometric albedo constraints for WASP-50 b and WASP-51 b: A(g) < 0.445 and A(g) < 0.368, respectively. We find that WASP-43 b and WASP-18 b are both consistent with low geometric albedos (A(g) < 0.16) even though they lie at opposite ends of the hot Jupiter temperature range with equilibrium temperatures of similar to 1400 K and similar to 2500 K, respectively. We report self-consistent atmospheric models that explain broad-band observations for both planets from TESS, HST, Spitzer, and VLT/HAWK-I. We find that the data of both hot Jupiters can be explained by thermal emission alone and inefficient day-night energy redistribution. The data do not require optical scattering from clouds/hazes, consistent with the low geometric albedos observed.

Acceptance Date Apr 5, 2022
Publication Date Jul 1, 2022
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Publisher Oxford University Press
Pages 3444 - 3457
Keywords techniques: photometric, planets and satellites: atmospheres, stars: individual: WASP targets, infrared: planetary systems, methods: data analysis
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