An image-plane algorithm for JWST's non-redundant aperture mask data

Abstract

The high angular resolution technique of non-redundant masking (NRM) or aperture masking interferometry (AMI) has yielded images of faint protoplanetary companions of nearby stars from the ground. AMI on James Webb Space Telescope (JWST)'s Near Infrared Imager and Slitless Spectrograph (NIRISS) has a lower thermal background than ground-based facilites and does not suffer from atmospheric instability. NIRISS AMI images are likely to have 90 - 95% Strehl ratio between 2.77 and 4.8 micron. In this paper we quantify factors that limit the raw point source contrast of JWST NRM. We develop an analytic model of the NRM point spread function which includes different optical path delays (pistons) between mask holes and fit the model parameters with image plane data. It enables a straightforward way to exclude bad pixels, is suited to limited fields of view, and can incorporate effects such as intra-pixel sensitivity variations. We simulate various sources of noise to estimate their effect on the standard deviation of closure phase, sigma_CP (a proxy for binary point source contrast). If sigma_CP < 10^-4 radians --- a contrast ratio of 10 magnitudes --- young accreting gas giant planets (e.g. in the nearby Taurus star-forming region) could be imaged with JWST NIRISS. We show the feasibility of using NIRISS' NRM with the sub-Nyquist sampled F277W, which would enable some exoplanet chemistry characterization. In the presence of small piston errors, the dominant sources of closure phase error (depending on pixel sampling, and filter bandwidth) are flat field errors and unmodeled variations in intra-pixel sensitivity. The in-flight stability of NIRISS will determine how well these errors can be calibrated by observing a point source. Our results help develop efficient observing strategies for space-based NRM.

Accepted to ApJ, 15 pages, 17 figures

References in corpus (28)

• The Gemini Planet Imager: First Light
• The 0.8-14.5 micron Spectra of Mid-L to Mid-T Dwarfs: Diagnostics of Effective Temperature, Grain Sedimentation, Gas Transport, and Surface Gravity
• LkCa 15: A Young Exoplanet Caught at Formation?
• Spitzer Infrared Spectrograph Observations of M, L, and T Dwarfs
• The Gemini NICI Planet-Finding Campaign: The Frequency of Planets around Young Moving Group Stars
• Two Wide Planetary-Mass Companions to Solar-Type Stars in Upper Scorpius
• The International Deep Planet Survey I. The frequency of wide-orbit massive planets around A-stars
• The Gemini NICI Planet-Finding Campaign: The Frequency of Giant Planets around Young B and A Stars
• Michelson Interferometry with the Keck I Telescope
• A companion candidate in the gap of the T Cha transitional disk
• A Combined VLT and Gemini Study of the Atmosphere of the Directly-Imaged Planet, beta Pictoris b
• Kernel-Phase in Fizeau Inteferometry
• The Gemini NICI Planet-Finding Campaign: The Frequency of Giant Planets Around Debris Disk Stars
• The Photometry of Undersampled Point Spread Functions
• Sparse aperture masking at the VLT I. Faint companion detection limits for the two debris disk stars HD 92945 and HD 141569
• Phase Errors in Diffraction-Limited Imaging: Contrast Limits for Sparse Aperture Masking
• Initial Results from the Palomar Adaptive Optics Survey of Young Solar-Type Stars: a Brown Dwarf and Three Stellar Companions
• Observational Constraints on Companions inside of 10 AU in the HR 8799 Planetary System
• Imaging Young Planets From Ground and Space
• Dynamical Mass of GJ 802B: a brown dwarf in a triple system
• Direct Detection of the Brown Dwarf GJ 802B with Adaptive Optics Masking Interferometry
• Dancing in the Dark: New Brown Dwarf Binaries from Kernel Phase Interferometry
• Precision Masses of the low-mass binary system GJ 623
• Visual orbit of GJ 164 AB
• Sparse Aperture Masking Observations of the FL Cha Pre-transitional Disk
• A Close Companion Search around L Dwarfs using Aperture Masking Interferometry and Palomar Laser Guide Star Adaptive Optics
• AGN and quasar science with aperture masking interferometry on the James Webb Space Telescope
• Kernel-phases for high-contrast detection beyond the resolution limit

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• Scientific Discovery with the James Webb Space Telescope
• A dusty veil shading Betelgeuse during its Great Dimming
• The path towards high-contrast imaging with the VLTI: the Hi-5 project
• The JWST Early Release Science Program for the Direct Imaging & Spectroscopy of Exoplanetary Systems
• The dusty heart of Circinus: I. Imaging the circumnuclear dust in N-band
• The Near Infrared Imager and Slitless Spectrograph for the James Webb Space Telescope -- IV. Aperture Masking Interferometry
• The Near Infrared Imager and Slitless Spectrograph for JWST -- V. Kernel Phase Imaging and Data Analysis
• Kernel-phase Detection Limits : Hypothesis Testing and the Example of JWST NIRISS Full Pupil Images
• NIRISS aperture masking interferometry: an overview of science opportunities
• In-focus wavefront sensing using non-redundant mask-induced pupil diversity
• Sparse aperture masking at the VLT II. Detection limits for the eight debris disks stars $\beta$ Pic, AU Mic, 49 Cet, $\eta$ Tel, Fomalhaut, g Lup, HD181327 and HR8799
• Detecting planetary mass companions near the water frost-line using JWST interferometry
• First light of a holographic aperture mask: Observation at the Keck OSIRIS Imager
• Performance of the Gemini Planet Imager Non-Redundant Mask and spectroscopy of two close-separation binaries HR 2690 and HD 142527
• Two Rings and a Marginally Resolved, 5 AU, Disk Around LkCa 15 Identified Via Near Infrared Sparse Aperture Masking Interferometry
• Phasing a deployable sparse telescope