  Direct imaging characterization of extrasolar planets is often done at low
spectral resolution. We model the spectrograph for the Gemini Planet Imager
upgrade (GPI 2.0) and assess the instrument's potential for allowing observers
to constrain exoplanet properties through analysis of near-infrared spectra. We
simulated noisy observations followed by calculations of posterior
distributions from maximum likelihood comparison with the Sonora 2018 model
grid. Preliminary results suggest that GPI 2.0 should allow observers to
constrain temperature with sufficient accuracy, but gravity remains largely
uncertain. We also explore the effects of incorporating convolution with the
instrument line spread function into our simulation and compare the results
with our preliminary findings.
