Detection of ice and gas species on Pluto spectra with James Webb Space Telescope

In this work, we present the analysis and discussion of the first 0.6-5.2 μm spectra of Pluto at four different longitudes obtained with the James Webb Space Telescope (JWST). These spectra were acquired during year 1 of operations of JWST under the GTO-1 program #1191, led by J. Stansberry. The high-resolution (R~2700), high-sensitivity combination of Webb/NIRSPEC using G140H, G235H, and G395H enables the robust detection of a diverse set of solid species. Some of these species, CH₄, β-N_2, CO and and C₂H₆ were previously known or suggested while others are now detected for the first time, including CH₃D (deuterated methane) and CO_2. The spectra also show expected absorptions by CH₄ gas from Pluto's atmosphere, and for the first time, fluorescent emissions due to CH₄, CO and CH₃D gas at 3.3, 4.7 and 4.54 μm respectively