λ = 2.4 to 5 μ m spectroscopy with the James Webb Space Telescope NIRCam instrument

Thomas P. Greene; Douglas M. Kelly; John Stansberry; Jarron Leisenring; Eiichi Egami; Everett Schlawin; Laurie Chu; Klaus W. Hodapp; Marcia Rieke

doi:10.1117/1.JATIS.3.3.035001

λ = 2.4 to 5 μ m spectroscopy with the James Webb Space Telescope NIRCam instrument

Thomas P. Greene, Douglas M. Kelly, John Stansberry, Jarron Leisenring, Eiichi Egami, Everett Schlawin, Laurie Chu, Klaus W. Hodapp, Marcia Rieke

Research output: Contribution to journal › Article › peer-review

45 Scopus citations

Abstract

The James Webb Space Telescope near-infrared camera (JWST NIRCam) has two 2.′2×2.′2 fields of view that can be observed with either imaging or spectroscopic modes. Either of two R∼1500 grisms with orthogonal dispersion directions can be used for slitless spectroscopy over λ=2.4 to 5.0μm in each module, and shorter wavelength observations of the same fields can be obtained simultaneously. We describe the design drivers and parameters of the grisms and present the latest predicted spectroscopic sensitivities, saturation limits, resolving powers, and wavelength coverage values. Simultaneous short wavelength (0.6 to 2.3μm) imaging observations of the 2.4 to 5.0μm spectroscopic field can be performed in one of several different filter bands, either infocus or defocused via weak lenses internal to the NIRCam. The grisms are available for single-object time-series spectroscopy and wide-field multiobject slitless spectroscopy modes in the first cycle of JWST observations. We present and discuss operational considerations including subarray sizes and data volume limits. Potential scientific uses of the grisms are illustrated with simulated observations of deep extragalactic fields, dark clouds, and transiting exoplanets. Information needed to plan observations using these spectroscopic modes is also provided.

Original language	English (US)
Article number	035001
Journal	Journal of Astronomical Telescopes, Instruments, and Systems
Volume	3
Issue number	3
DOIs	https://doi.org/10.1117/1.JATIS.3.3.035001
State	Published - Jul 1 2017

Keywords

cameras
gratings
infrared spectroscopy
satellites
space optics

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Control and Systems Engineering
Instrumentation
Astronomy and Astrophysics
Mechanical Engineering
Space and Planetary Science

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10.1117/1.JATIS.3.3.035001

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title = "λ = 2.4 to 5 μ m spectroscopy with the James Webb Space Telescope NIRCam instrument",

abstract = "The James Webb Space Telescope near-infrared camera (JWST NIRCam) has two 2.′2×2.′2 fields of view that can be observed with either imaging or spectroscopic modes. Either of two R∼1500 grisms with orthogonal dispersion directions can be used for slitless spectroscopy over λ=2.4 to 5.0μm in each module, and shorter wavelength observations of the same fields can be obtained simultaneously. We describe the design drivers and parameters of the grisms and present the latest predicted spectroscopic sensitivities, saturation limits, resolving powers, and wavelength coverage values. Simultaneous short wavelength (0.6 to 2.3μm) imaging observations of the 2.4 to 5.0μm spectroscopic field can be performed in one of several different filter bands, either infocus or defocused via weak lenses internal to the NIRCam. The grisms are available for single-object time-series spectroscopy and wide-field multiobject slitless spectroscopy modes in the first cycle of JWST observations. We present and discuss operational considerations including subarray sizes and data volume limits. Potential scientific uses of the grisms are illustrated with simulated observations of deep extragalactic fields, dark clouds, and transiting exoplanets. Information needed to plan observations using these spectroscopic modes is also provided.",

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T1 - λ = 2.4 to 5 μ m spectroscopy with the James Webb Space Telescope NIRCam instrument

AU - Greene, Thomas P.

AU - Kelly, Douglas M.

AU - Stansberry, John

AU - Leisenring, Jarron

AU - Egami, Eiichi

AU - Schlawin, Everett

AU - Chu, Laurie

AU - Hodapp, Klaus W.

AU - Rieke, Marcia

N1 - Publisher Copyright: © 2017 The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

PY - 2017/7/1

Y1 - 2017/7/1

N2 - The James Webb Space Telescope near-infrared camera (JWST NIRCam) has two 2.′2×2.′2 fields of view that can be observed with either imaging or spectroscopic modes. Either of two R∼1500 grisms with orthogonal dispersion directions can be used for slitless spectroscopy over λ=2.4 to 5.0μm in each module, and shorter wavelength observations of the same fields can be obtained simultaneously. We describe the design drivers and parameters of the grisms and present the latest predicted spectroscopic sensitivities, saturation limits, resolving powers, and wavelength coverage values. Simultaneous short wavelength (0.6 to 2.3μm) imaging observations of the 2.4 to 5.0μm spectroscopic field can be performed in one of several different filter bands, either infocus or defocused via weak lenses internal to the NIRCam. The grisms are available for single-object time-series spectroscopy and wide-field multiobject slitless spectroscopy modes in the first cycle of JWST observations. We present and discuss operational considerations including subarray sizes and data volume limits. Potential scientific uses of the grisms are illustrated with simulated observations of deep extragalactic fields, dark clouds, and transiting exoplanets. Information needed to plan observations using these spectroscopic modes is also provided.

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KW - cameras

KW - gratings

KW - infrared spectroscopy

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λ = 2.4 to 5 μ m spectroscopy with the James Webb Space Telescope NIRCam instrument

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