Sensitivity of the Roman Coronagraph Instrument to Exozodiacal Dust

Abstract

Exozodiacal dust, warm debris from comets and asteroids in and near the habitable zone of stellar systems, reveals the physical processes that shape planetary systems. Scattered light from this dust is also a source of background flux which must be overcome by future missions to image Earthlike planets. This study quantifies the sensitivity of the Nancy Grace Roman Space Telescope Coronagraph to light scattered by exozodi, the zodiacal dust around other stars. Using a sample of 149 nearby stars, previously selected for optimum detection of habitable exoplanets by space observatories, we find the maximum number of exozodiacal disks with observable \textit{inner} habitable zone boundaries is six and the number of observable outer habitable boundaries is 74. One zodi was defined as the visible-light surface brightness of 22 $m_{\mathrm{V}}$arcsec${}^{-2}$ around a solar-mass star, approximating the scattered light brightness in visible light at the Earth-equivalent insolation. In the speckle limited case, where the signal-to-noise ratio is limited by speckle temporal stability rather than shot noise, the median $5\sigma$ sensitivity to habitable zone exozodi is 12 zodi per resolution element. This estimate is calculated at the inner-working angle of the coronagraph, for the current best estimate performance, neglecting margins on the uncertainty in instrument performance and including a post-processing speckle suppression factor. For an log-norm distribution of exozodi levels with a median exozodi of 3$\times$ the solar zodi, we find that the Roman Coronagraph would be able to make 5$\sigma$ detections of exozodiacal disks in scattered light from 13 systems with a 95\% confidence interval spanning 7-20 systems. This sensitivity allows Roman Coronagraph to complement ground-based measurements of exozodiacal thermal emission and constrain dust albedos.

arXiv comment30 pages, 8 figures, 2 tables, accepted to PASP

References in corpus (56)

• Astropy: A Community Python Package for Astronomy
• The Wide-field Infrared Survey Explorer (WISE): Mission Description and Initial On-orbit Performance
• Habitable Zones Around Main-Sequence Stars: New Estimates
• The Disk Substructures at High Angular Resolution Project (DSHARP): I. Motivation, Sample, Calibration, and Overview
• Detection and Characterization of Exoplanets and Disks using Projections on Karhunen-Loeve Eigenimages
• Studies in Astronomical Time Series Analysis. VI. Bayesian Block Representations
• Exoplanet Biosignatures: A Review of Remotely Detectable Signs of Life
• Cometary Origin of the Zodiacal Cloud and Carbonaceous Micrometeorites
• The COBE Diffuse Infrared Background Experiment Search for the Cosmic Infrared Background: II. Model of the Interplanetary Dust Cloud
• A new algorithm for point spread function subtraction in high-contrast imaging: a demonstration with angular differential imaging
• A planetary system as the origin of structure in Fomalhaut's dust belt
• The Habitability of Planets Orbiting M-dwarf Stars
• How to Characterize Habitable Worlds and Signs of Life
• Probing for Exoplanets Hiding in Dusty Debris Disks: Disk Imaging, Characterization, and Exploration with HST/STIS Multi-Roll Coronagraphy
• The Insignificance of P-R Drag in Detectable Extrasolar Planetesimal Belts
• Polarimetry with the Gemini Planet Imager: Methods, Performance at First Light, and the Circumstellar Ring around HR 4796A
• Maximizing the ExoEarth Candidate Yield from a Future Direct Imaging Mission
• The Habitable Exoplanet Observatory (HabEx) Mission Concept Study Final Report
• HST/NICMOS detection of HR 8799 b in 1998
• SPHERE / ZIMPOL high resolution polarimetric imager. I. System overview, PSF parameters, coronagraphy, and polarimetry
• Lower Limits on Aperture Size for an ExoEarth-Detecting Coronagraphic Mission
• The HOSTS survey for exozodiacal dust: Observational results from the complete survey
• Non-negative Matrix Factorization: Robust Extraction of Extended Structures
• The LUVOIR Mission Concept Study Final Report
• A Sensitive Identification of Warm Debris Disks in the Solar Neighborhood Through Precise Calibration of Saturated WISE Photometry
• The Exozodiacal Dust Problem for Direct Observations of ExoEarths
• Nulling interferometry: impact of exozodiacal clouds on the performance of future life-finding space missions
• The Near-Sun Dust Environment: Initial Observations from Parker Solar Probe
• The Detectability of Exo-Earths and Super-Earths Via Resonant Signatures in Exozodiacal Clouds
• The HOSTS survey - Exozodiacal dust measurements for 30 stars
• Hubble Space Telescope Observations of the HD 202628 Debris Disk
• The search for habitable worlds: 1. The viability of a starshade mission
• Developing Atmospheric Retrieval Methods for Direct Imaging Spectroscopy of Gas Giants in Reflected Light I: Methane Abundances and Basic Cloud Properties
• Analyzing the designs of planet finding missions
• First-light LBT nulling interferometric observations: warm exozodiacal dust resolved within a few AU of eta Corvi
• The Gray Needle: Large Grains in the HD 15115 Debris Disk from LBT/PISCES/Ks and LBTI/LMIRcam/L' Adaptive Optics Imaging
• Habitable Zones of Post-Main Sequence Stars
• WFIRST-AFTA Coronagraph Science Yield Modeling with EXOSIMS
• First scattered-light images of the gas-rich debris disk around 49 Ceti
• Exo-zodi modelling for the Large Binocular Telescope Interferometer
• Subaru/SCExAO First-Light Direct Imaging of a Young Debris Disk around HD 36546
• A Word to the WISE: Confusion is Unavoidable for WISE-selected Infrared Excesses
• The Pseudo-zodi Problem for Edge-on Planetary Systems
• ALMA Observations of the Debris Disk of Solar Analogue Tau Ceti
• The Gemini Planet Imager view of the HD 32297 debris disk
• Follow-up Imaging of Disk Candidates from the Disk Detective Citizen Science Project: New Discoveries and False-Positives in WISE Circumstellar Disk Surveys
• MagAO Imaging of Long-period Objects (MILO). I. A Benchmark M Dwarf Companion Exciting a Massive Planet around the Sun-like Star HD 7449
• Flight mask designs of the Roman Space Telescope Coronagraph Instrument
• Paving the Way to Future Missions: the Roman Space Telescope Coronagraph Technology Demonstration
• Prospects for Directly Imaging Young Giant Planets at Optical Wavelengths
• Nonnegative Matrix Factorization (NMF) with Heteroscedastic Uncertainties and Missing data
• WFIRST Coronagraph Technology Requirements: Status Update and Systems Engineering Approach
• Post-processing of the HST STIS coronagraphic observations
• A review of simulation and performance modeling for the Roman coronagraph instrument
• Orbital Differential Imaging: A New High-Contrast Post-Processing Technique For Direct Imaging of Exoplanets
• Faster imaging simulation through complex systems: a coronagraphic example

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• The Roman coronagraph community participation program: observation planning
• SPHERE RefPlanets: Search for epsilon Eridani b and warm dust
• Review and prospects of hot exozodiacal dust research for future exo-Earth direct imaging missions
• Simulations of polarimetric observations of debris disks through the Roman Coronagraph Instrument
• The Nancy Grace Roman Space Telescope Coronagraph Community Participation Program