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We present a comprehensive analysis of the 0.3--5\,$\mu$m transit spectrumfor the inflated hot Jupiter HAT-P-41b. The planet was observed in transit withHubble STIS and WFC3 as part of the Hubble Panchromatic Comparative ExoplanetTreasury (PanCET) program, and we combine those data with warm \textit{Spitzer}transit observations. We extract transit depths from each of the data sets,presenting the STIS transit spectrum (0.29--0.93\,$\mu$m) for the first time.We retrieve the transit spectrum both with a free-chemistry retrieval suite(AURA) and a complementary chemical equilibrium retrieval suite (PLATON) toconstrain the atmospheric properties at the day-night terminator. Both methodsprovide an excellent fit to the observed spectrum. Both AURA and PLATONretrieve a metal-rich atmosphere for almost all model assumptions (most likelyO/H ratio of $\log_{10}{Z/Z_{\odot}} = 1.46^{+0.53}_{-0.68}$ and$\log_{10}{Z/Z_{\odot}} = 2.33^{+0.23}_{-0.25}$, respectively); this is drivenby a 4.9-$\sigma$ detection of H$_2$O as well as evidence of gas absorption inthe optical ($>$2.7-$\sigma$ detection) due to Na, AlO and/or VO/TiO, though noindividual species is strongly detected. Both retrievals determine the transitspectrum to be consistent with a clear atmosphere, with no evidence of haze orhigh-altitude clouds. Interior modeling constraints on the maximum atmosphericmetallicity ($\log_{10}{Z/Z_{\odot}} < 1.7$) favor the AURA results. Theinferred elemental oxygen abundance suggests that HAT-P-41b has one of the mostmetal-rich atmospheres of any hot Jupiters known to date. Overall, the inferredhigh metallicity and high inflation make HAT-P-41b an interesting test case forplanet formation theories.

The Hubble PanCET Program: A Metal-rich Atmosphere for the Inflated Hot Jupiter HAT-P-41b