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The recently developed JWST Exoplanet Observation Simulator (JexoSim)simulates transit spectroscopic observations of exoplanets by JWST with each ofits four instruments using a time-domain approach. Previously we reported thevalidation of JexoSim against Pandexo and instrument team simulators. In thepresent study, we report a substantially enhanced version, JexoSim 2.0, whichimproves on the original version through incorporation of new noise sources,enhanced treatment of stellar and planetary signals and instrumental effects,as well as improved user-operability and optimisations for increased speed andefficiency. A near complete set of instrument modes for exoplanet time-seriesobservations is now included. In this paper we report the implementation ofJexoSim 2.0 and assess performance metrics for JWST in end-member scenariosusing the hot Jupiter HD 209458 b and the mini-Neptune K2-18 b. We show howJexoSim can be used to compare performance across the different JWSTinstruments, selecting an optimal combination of instrument and subarray modes,producing synthetic transmission spectra for each planet. These studiesindicate that the 1.4 {\mu}m water feature detected in the atmosphere of K2-18b using the Hubble WFC3 might be observable in just one transit observationwith JWST with either NIRISS or NIRSpec. JexoSim 2.0 can be used to investigatethe impact of complex noise and systematic effects on the final spectrum, planobservations and test the feasibility of novel science cases for JWST. It canalso be customised for other astrophysical applications beyond exoplanetspectroscopy. JexoSim 2.0 is now available for use by the scientific community.

JexoSim 2.0: End-to-End JWST Simulator for Exoplanet Spectroscopy -- Implementation and Case Studies