The Near Infrared Imager and Slitless Spectrograph for the James Webb Space Telescope. I. Instrument Overview and In-flight Performance

Author:

Doyon RenéORCID,Willott Chris J.ORCID,Hutchings John B.,Sivaramakrishnan AnandORCID,Albert LoïcORCID,Lafrenière DavidORCID,Rowlands NeilORCID,Begoña Vila M.ORCID,Martel André R.,LaMassa StephanieORCID,Aldridge David,Artigau ÉtienneORCID,Cameron Peter,Chayer PierreORCID,Cook Neil J.ORCID,Cooper Rachel A.ORCID,Darveau-Bernier AntoineORCID,Dupuis Jean,Earnshaw Colin,Espinoza NéstorORCID,Filippazzo Joseph C.ORCID,Fullerton Alexander W.ORCID,Gaudreau Daniel,Gawlik Roman,Goudfrooij PaulORCID,Haley Craig,Kammerer JensORCID,Kendall David,Lambros Scott D.,Ignat Luminita Ilinca,Maszkiewicz Michael,McColgan Ashley,Morishita TakahiroORCID,Ouellette Nathalie N.-Q.ORCID,Pacifici CamillaORCID,Philippi Natasha,Radica MichaelORCID,Ravindranath SwaraORCID,Rowe JasonORCID,Roy ArpitaORCID,Roy Niladri,Saad Karl,Sohn Sangmo TonyORCID,Talens Geert JanORCID,Touahri Driss,Thatte Deepashri,Taylor Joanna M.ORCID,Vandal ThomasORCID,Volk KevinORCID,Wander Michel,Warner Gerald,Zheng Sheng-Hai,Zhou Julia,Abraham RobertoORCID,Beaulieu Mathilde,Benneke Björn,Ferrarese LauraORCID,Jayawardhana RayORCID,Johnstone DougORCID,Kaltenegger LisaORCID,Meyer Michael R.ORCID,Pipher Judy L.ORCID,Rameau JulienORCID,Rieke MarciaORCID,Salhi SalmaORCID,Sawicki MarcinORCID

Abstract

Abstract The Near-Infrared Imager and Slitless Spectrograph (NIRISS) is the science module of the Canadian-built Fine Guidance Sensor onboard the James Webb Space Telescope (JWST). NIRISS has four observing modes: (1) broadband imaging featuring seven of the eight NIRCam broadband filters, (2) wide-field slitless spectroscopy at a resolving power of ∼150 between 0.8 and 2.2 μm, (3) single-object cross-dispersed slitless spectroscopy (SOSS) enabling simultaneous wavelength coverage between 0.6 and 2.8 μm at R ∼ 700, a mode optimized for exoplanet spectroscopy of relatively bright (J < 6.3) stars and (4) aperture masking interferometry (AMI) between 2.8 and 4.8 μm enabling high-contrast (∼10−3 − 10−4) imaging at angular separations between 70 and 400 mas for relatively bright (M < 8) sources. This paper presents an overview of the NIRISS instrument, its design, its scientific capabilities, and a summary of in-flight performance. NIRISS shows significantly better response shortward of ∼2.5 μm resulting in 10%–40% sensitivity improvement for broadband and low-resolution spectroscopy compared to pre-flight predictions. Two time-series observations performed during instrument commissioning in the SOSS mode yield very stable spectro-photometry performance within ∼10% of the expected noise. The first space-based companion detection of the tight binary star AB Dor AC through AMI was demonstrated.

Funder

René Doyon

Publisher

IOP Publishing

Subject

Space and Planetary Science,Astronomy and Astrophysics

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