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We present a new optical transmission spectrum of the hot Jupiter HAT-P-1bbased on two transits observed with the Double Spectrograph (DBSP) on thePalomar 200-inch (P200) telescope. The DBSP transmission spectrum, covering awavelength range from 3250 to 10007 \r{A}, is consistent with that observedwith the Hubble Space Telescope (HST), but the former has a finer spectralresolution. The DBSP spectrum alone reveals the presence of a pressurebroadened line wing for Na, the line cores for both Na and K, and tentativeevidence for H$_2$O. We obtain consistent results from the spectral retrievalanalyses performed on the DBSP-only dataset and the DBSP, HST, and Spitzercombined dataset. Our retrievals suggest a mostly clear atmosphere forHAT-P-1b, with a cloud coverage of $22^{+5}_{-3}$% that is dominated byenhanced haze. We derive subsolar abundances for Na, K, and C, andsubsolar-to-solar for O. Future observations with James Webb Space Telescopeand ground-based high-resolution spectrographs should be able to not onlyconfirm the presence of these species but also stringently constrain theformation and migration pathways for HAT-P-1b.

Detection of Na and K in the atmosphere of the hot Jupiter HAT-P-1b with P200/DBSP