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We present a precise ground-based optical transmission spectrum of thehot-Saturn HATS-5b ($T_{eq} =1025$ K), obtained as part of the ACCESS surveywith the IMACS multi-object spectrograph mounted on the Magellan/BaadeTelescope. Our spectra cover the 0.5 to 0.9 micron region, and are the productof 5 individual transits observed between 2014 and 2018. We introduce the usageof additional second-order light in our analyses which allows us to extract an"extra" transit light curve, improving the overall precision of our combinedtransit spectrum. We find that the favored atmospheric model for thistransmission spectrum is a solar-metallicity atmosphere with sub-solar C/O,whose features are dominated by H$_2$O and with a depleted abundance of Na andK. If confirmed, this would point to a "clear" atmosphere at the pressurelevels probed by transmission spectroscopy for HATS-5b. Our best-fitatmospheric model predicts a rich near-IR spectrum, which makes this exoplanetan excellent target for future follow-up observations with the James Webb SpaceTelescope, both to confirm this H$_2$O detection and to superbly constrain theatmosphere's parameters.

ACCESS: Tentative detection of H$_2$O in the ground-based optical transmission spectrum of the low-density hot Saturn HATS-5b