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We present a uniform analysis of transit observations from the Hubble SpaceTelescope and Spitzer Space Telescope of two warm gas giants orbiting K-typestars - WASP-29b and WASP-80b. The transmission spectra, which span 0.4-5.0$\mu$m, are interpreted using a suite of chemical equilibrium PLATONatmospheric retrievals. Both planets show evidence of significant aerosolopacity along the day-night terminator. The spectrum of WASP-29b is flatthroughout the visible and near-infrared, suggesting the presence of condensateclouds extending to low pressures. The lack of spectral features hinders ourability to constrain the atmospheric metallicity and C/O ratio. In contrast,WASP-80b shows a discernible, albeit muted H$_2$O absorption feature at 1.4$\mu$m, as well as a steep optical spectral slope that is caused byfine-particle aerosols and/or contamination from unocculted spots on thevariable host star. WASP-80b joins the small number of gas-giant exoplanetsthat show evidence for enhanced atmospheric metallicity: the transmissionspectrum is consistent with metallicities ranging from $\sim$30-100 times solarin the case of cloudy limbs to a few hundred times solar in the cloud-freescenario. In addition to the detection of water, we infer the presence ofCO$_2$ in the atmosphere of WASP-80b based on the enhanced transit depth in theSpitzer 4.5 $\mu$m bandpass. From a complementary analysis of Spitzer secondaryeclipses, we find that the dayside emission from WASP-29b and WASP-80b isconsistent with brightness temperatures of $937 \pm 48$ and $851 \pm 14$ K,respectively, indicating relatively weak day-night heat transport and low Bondalbedo.

The Hubble PanCET Program: A Featureless Transmission Spectrum for WASP-29b and Evidence of Enhanced Atmospheric Metallicity on WASP-80b