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The hot sub-Saturn-mass exoplanet HAT-P-12b is an ideal target fortransmission spectroscopy because of its inflated radius. We observed onetransit of the planet with the multi-object double spectrograph (MODS) on theLarge Binocular Telescope (LBT) with the binocular mode and obtained anatmosphere transmission spectrum with a wavelength coverage of $\sim$ 0.4 --0.9 $\mathrm{\mu}$m. The spectrum is relatively flat and does not show anysignificant sodium or potassium absorption features. Our result is consistentwith the revised Hubble Space Telescope (HST) transmission spectrum of aprevious work, except that the HST result indicates a tentative detection ofpotassium. The potassium discrepancy could be the result of statisticalfluctuation of the HST dataset. We fit the planetary transmission spectrum withan extensive grid of cloudy models and confirm the presence of high-altitudeclouds in the planetary atmosphere. The fit was performed on the combined LBTand HST spectrum, which has an overall wavelength range of 0.4 -- 1.6$\mathrm{\mu}$m. The LBT/MODS spectrograph has unique advantages intransmission spectroscopy observations because it can cover a wide wavelengthrange with a single exposure and acquire two sets of independent spectrasimultaneously.

LBT transmission spectroscopy of HAT-P-12b: confirmation of a cloudy atmosphere with no significant alkali features