Updated Standard Evaluation of exoplanet Yield for the LUVOIR and HabEx Concept Studies

The HabEx and LUVOIR concepts aim to directly image and spectrally characterize potentially habitable exoplanets. Using EXOSIMS, realistic mission observing constraints, and dynamically responsive scheduling, we simulate the exoplanet detection and characterizations over Monte Carlo realizations of synthetic planets around nearby stars. We use identical astrophysical inputs and the observing scenarios of each concept to evaluate a common comparison of the detection and spectral characterization yields of HabEx and LUVOIR. HabEx is evaluated for the 4m hybrid starshade and coronagraph architecture, the 4m coronagraph only architecture, and the 3.2 m starshade only architecture. LUVOIR is evaluated for the 15 m on-axis and 9 m off-axis architectures. The scenarios are scheduled to respond dynamically to the number of detections/no-detections of a target and success of characterization as well as the optimal slews for the starshade. Yield analysis shows that both concepts can directly image and spectrally characterize earth-like planets in the Habitable zone and that each concept has complementary strengths.