Abstract
ABSTRACT The recently developed JWST Exoplanet Observation Simulator (JexoSim) simulates transit spectroscopic observations of exoplanets by JWST with each of its four instruments using a time-domain approach. Previously, we reported the validation of JexoSim against Pandexo and instrument team simulators. In the present study, we report a substantially enhanced version, JexoSim 2.0, which improves 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 optimizations for increased speed and efficiency. A near complete set of instrument modes for exoplanet time-series observations is now included. In this paper, we report the implementation of JexoSim 2.0 and assess performance metrics for JWST in end-member scenarios using the hot Jupiter HD 209458 b and the mini-Neptune K2-18 b. We show how JexoSim can be used to compare performance across the different JWST instruments, selecting an optimal combination of instrument and subarray modes, producing synthetic transmission spectra for each planet. These studies indicate that the 1.4 $\mu$m water feature detected in the atmosphere of K2-18 b using the Hubble WFC3 might be observable in just one transit observation with JWST with either NIRISS or NIRSpec. JexoSim 2.0 can be used to investigate the impact of complex noise and systematic effects on the final spectrum, plan observations and test the feasibility of novel science cases for JWST. It can also be customized for other astrophysical applications beyond exoplanet spectroscopy. JexoSim 2.0 is now available for use by the scientific community.
Highlights
D Since the discovery of the first extra-solar planets a quarter of a century ago (Mayor & Queloz 1995; Wolszczan & Frail 1992), ourE understanding of planets around other stars has expanded greatly.We know of the existence of over 4000 exoplanets1 covering aN diverse range of sizes, masses, temperatures and orbital configuraof transmission and eclipse spectroscopy (Seager & Sasselov 2000; Charbonneau et al 2002; Grillmair et al 2008; Deming et al 2013), as well as direct imaging (Konopacky et al 2013; Janson et al 2010)
In this paper we report the implementation of James Webb Space Telescope (JWST) Exoplanet Observation Simulator (JexoSim) 2.0 and assess performance metrics for JWST in end-member scenarios
We developed the first version of JexoSim (Sarkar et al 2019) to fill this gap in
Summary
D Since the discovery of the first extra-solar planets a quarter of a century ago (Mayor & Queloz 1995; Wolszczan & Frail 1992), our. Simulators that model the of JWST instrument modes designated for exoplanet time-series observations. With these enhancements JexoSim 2.0 is available to the community. G simulators for JWST do not model the time-domain directly, but I estimate the final noise on the transit depth through a static calculaR tion. This approach leads to rapid computations which is ideal for Neptune K2-18b. We perform simulated observations using all four JWST instruments and demonstrate different simulation recipes These include using Allan deviation analysis and Monte Carlo simulations to obtain precision on transit and eclipse depths and a noise budget analysis. Troscopy using JWST and it four instruments, designed to test and validate specific and novel science cases for JWST observation
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
