Transmission Spectroscopy of the Hot-Jupiter WASP-79b from 0.6 to 1.7 um

As part of the PanCET program, we are conducting a spectroscopic study of WASP-79b, a Jupiter-size exoplanet orbiting an F-type star in Eridanus with a period of 3.66 days. Building on the original WASP and TRAPPIST photometry of Smalley et al, we are examining HST/WFC3 data (1.125 – 1.650 um) as well as Magellan/LDSS-3c (0.6 – 1 um) data via the reduction and light-curve fitting processes described in Stevenson et al, 2014.  We will present preliminary results, which show indications of a water feature at 1.4 um, along with a comparison to a spectroscopic evaluation conducted via a separate methodology.  This suggested water feature makes WASP-79b a target of interest for the approved DD-ERS program, with ERS observations planned to be the first to execute in Cycle 1.  Transiting exoplanets were recently approved for 78.1 hours of data collection, and with the delay in the JWST launch, WASP-79b is now a target for the Panchromatic Transmission program.  This program will acquire transits in 5 instrument modes, providing substantially more data by which to investigate this hot Jupiter.

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