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Proceedings Paper

Slitless spectroscopy with the James Webb Space Telescope Near-Infrared Camera (JWST NIRCam)
Author(s): Thomas P. Greene; Laurie Chu; Eiichi Egami; Klaus W. Hodapp; Douglas M. Kelly; Jarron Leisenring; Marcia Rieke; Massimo Robberto; Everett Schlawin; John Stansberry
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Paper Abstract

The James Webb Space Telescope near-infrared camera (JWST NIRCam) has two 2.02 x 2.02 fields of view that are capable of either imaging or spectroscopic observations. Either of two R ~ 1500 grisms with orthogonal dispersion directions can be used for slitless spectroscopy over λ = 2.4 − 5.0 μm in each module, and shorter wavelength observations of the same fields can be obtained simultaneously. We present the latest predicted grism sensitivities, saturation limits, resolving power, and wavelength coverage values based on component measurements, instrument tests, and end-to-end modeling. Short wavelength (0.6 – 2.3 μm) imaging observations of the 2.4 - 5.0 μm spectroscopic field can be performed in one of several different filter bands, either in-focus or defocused via weak lenses internal to NIRCam. Alternatively, the possibility of 1.0 – 2.0 μm spectroscopy (simultaneously with 2.4 – 5.0 μm) using dispersed Hartmann sensors (DHSs) is being explored. The grisms, weak lenses, and DHS elements were included in NIRCam primarily for wavefront sensing purposes, but all have significant science applications. Operational considerations including subarray sizes, and data volume limits are also discussed. Finally, we describe spectral simulation tools and illustrate potential scientific uses of the grisms by presenting simulated observations of deep extragalactic fields, galactic dark clouds, and transiting exoplanets.

Paper Details

Date Published: 29 July 2016
PDF: 12 pages
Proc. SPIE 9904, Space Telescopes and Instrumentation 2016: Optical, Infrared, and Millimeter Wave, 99040E (29 July 2016); doi: 10.1117/12.2231347
Show Author Affiliations
Thomas P. Greene, NASA Ames Research Ctr. (United States)
Laurie Chu, Institute for Astronomy, Univ. of Hawai’i (United States)
Eiichi Egami, Steward Observatory, The Univ. of Arizona (United States)
Klaus W. Hodapp, Institute for Astronomy, Univ. of Hawai’i (United States)
Douglas M. Kelly, Steward Observatory, Univ. of Arizona (United States)
Jarron Leisenring, Steward Observatory, Univ. of Arizona (United States)
Marcia Rieke, Steward Observatory, Univ. of Arizona (United States)
Massimo Robberto, Space Telescope Science Institute (United States)
Everett Schlawin, Steward Observatory, Univ. of Arizona (United States)
John Stansberry, Space Telescope Science Institute (United States)


Published in SPIE Proceedings Vol. 9904:
Space Telescopes and Instrumentation 2016: Optical, Infrared, and Millimeter Wave
Howard A. MacEwen; Giovanni G. Fazio; Makenzie Lystrup; Natalie Batalha; Nicholas Siegler; Edward C. Tong, Editor(s)

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