Optimized Bandpasses for the Habitable Worlds Observatory's ExoEarth Survey

Abstract

A primary scientific goal of the future Habitable Worlds Observatory will be the direct detection and characterization of Earth-like planets. Estimates of the exoplanet yields for this concept will help guide mission design through detailed trade studies. It is therefore critical that yield estimation codes optimally adapt observations to the mission's performance parameters to ensure accurate trade studies. To aid in this, we implement wavelength optimization in yield calculations for the first time, allowing the yield code to determine the ideal detection and characterization bandpasses. We use this new capability to confirm the observational wavelength assumptions made for the LUVOIR-B study, namely that the optimum detection wavelength is 500 nm for the majority of targets and the optimum wavelength to detect water is near 1000 nm, given LUVOIR-B's assumed instrument performance parameters. We show that including the wavelength dependent albedo of an Earth twin as a prior provides no significant benefit to the yields of exoEarth candidates and caution against tuning observations to modern Earth twins. We also show that coronagraphs whose inner working angles are similar to step functions may benefit from wavelength optimization and demonstrate how wavelength-dependent instrument performance can impact the optimum wavelengths for detection and characterization. The optimization methods we implement automate wavelength selection and remove uncertainties regarding these choices, helping to adapt the observations to the instrument's performance parameters.

Accepted for publication in JATIS 26 pages, 14 figures, 1 table

References in corpus (9)

• New Grids of ATLAS9 Model Atmospheres
• The Pale Orange Dot: The Spectrum and Habitability of Hazy Archean Earth
• Maximizing the ExoEarth Candidate Yield from a Future Direct Imaging Mission
• The Habitable Exoplanet Observatory (HabEx) Mission Concept Study Final Report
• Pale Orange Dots: The Impact of Organic Haze on the Habitability and Detectability of Earthlike Exoplanets
• True Masses of Radial-Velocity Exoplanets
• Finding the Needles in the Haystacks: High-Fidelity Models of the Modern and Archean Solar System for Simulating Exoplanet Observations
• Apodized pupil Lyot coronagraphs designs for future segmented space telescopes
• Grid-Based Atmospheric Retrievals for Reflected-Light Spectra of Exoplanets using PSGnest