Observing exoplanets with the JWST NIRCam grisms

Thomas Greene, Charles Beichman, Daniel Eisenstein, Scott Horner, Douglas Kelly, Yalan Mao, Michael Meyer, Marcia J Rieke, Fang Shi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

15 Citations (Scopus)

Abstract

The near-infrared camera (NIRCam) on the James Webb Space Telescope (JWST) will incorporate 2 identical grisms in each of its 2 long wavelength channels. These transmission gratings have been added to assist with the coarse phasing of the JWST telescope, but they will also be used for slitless wide-field scientific observations over selectable regions of the A = 2.4 - 5.0 μm. wavelength range at spectroscopic resolution R ≡ λ/δλX ≃ 2000. We describe the grism design details and their expected performance in NIRCam. The grisms will provide pointsource continuum sensitivity of approximately AB = 23 mag in 10,000 s exposures with S/N = 5 when binned to R = 1000. This is approximately a factor of 3 worse than expected for the JWST NIRSpec instrument, but the NIRCam grisms provide better spatial resolution, better spectrophotometric precision, and complete field coverage. The grisms will be especially useful for high precision spectrophotometric observations of transiting exoplanets. We expect that R = 500 spectra of the primary transits and secondary eclipses of Jupiter-sized exoplanets can be acquired at moderate or high signal-to-noise for stars as faint as M = 10 - 12 mag in 1000 s of integration time, and even bright stars (V = 5 mag) should be observable without saturation. We also discuss briefly how these observations will open up new areas of exoplanet science and suggest other unique scientific applications of the grisms.

Original languageEnglish (US)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
Volume6693
DOIs
StatePublished - 2007
EventTechniques and Instrumentation for Detection of Exoplanets III - San Diego, CA, United States
Duration: Aug 28 2007Aug 30 2007

Other

OtherTechniques and Instrumentation for Detection of Exoplanets III
CountryUnited States
CitySan Diego, CA
Period8/28/078/30/07

Fingerprint

James Webb Space Telescope
Space telescopes
extrasolar planets
Cameras
cameras
Infrared radiation
Stars
stars
Wavelength
eclipses
transit
Jupiter (planet)
Telescopes
wavelengths
spatial resolution
gratings
telescopes
continuums
saturation
sensitivity

Keywords

  • Exoplanets
  • Grisms
  • JWST
  • Near-infrared
  • NIRCam
  • Spectroscopy

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics

Cite this

Greene, T., Beichman, C., Eisenstein, D., Horner, S., Kelly, D., Mao, Y., ... Shi, F. (2007). Observing exoplanets with the JWST NIRCam grisms. In Proceedings of SPIE - The International Society for Optical Engineering (Vol. 6693). [66930G] https://doi.org/10.1117/12.732506

Observing exoplanets with the JWST NIRCam grisms. / Greene, Thomas; Beichman, Charles; Eisenstein, Daniel; Horner, Scott; Kelly, Douglas; Mao, Yalan; Meyer, Michael; Rieke, Marcia J; Shi, Fang.

Proceedings of SPIE - The International Society for Optical Engineering. Vol. 6693 2007. 66930G.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Greene, T, Beichman, C, Eisenstein, D, Horner, S, Kelly, D, Mao, Y, Meyer, M, Rieke, MJ & Shi, F 2007, Observing exoplanets with the JWST NIRCam grisms. in Proceedings of SPIE - The International Society for Optical Engineering. vol. 6693, 66930G, Techniques and Instrumentation for Detection of Exoplanets III, San Diego, CA, United States, 8/28/07. https://doi.org/10.1117/12.732506
Greene T, Beichman C, Eisenstein D, Horner S, Kelly D, Mao Y et al. Observing exoplanets with the JWST NIRCam grisms. In Proceedings of SPIE - The International Society for Optical Engineering. Vol. 6693. 2007. 66930G https://doi.org/10.1117/12.732506
Greene, Thomas ; Beichman, Charles ; Eisenstein, Daniel ; Horner, Scott ; Kelly, Douglas ; Mao, Yalan ; Meyer, Michael ; Rieke, Marcia J ; Shi, Fang. / Observing exoplanets with the JWST NIRCam grisms. Proceedings of SPIE - The International Society for Optical Engineering. Vol. 6693 2007.
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AU - Rieke, Marcia J

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N2 - The near-infrared camera (NIRCam) on the James Webb Space Telescope (JWST) will incorporate 2 identical grisms in each of its 2 long wavelength channels. These transmission gratings have been added to assist with the coarse phasing of the JWST telescope, but they will also be used for slitless wide-field scientific observations over selectable regions of the A = 2.4 - 5.0 μm. wavelength range at spectroscopic resolution R ≡ λ/δλX ≃ 2000. We describe the grism design details and their expected performance in NIRCam. The grisms will provide pointsource continuum sensitivity of approximately AB = 23 mag in 10,000 s exposures with S/N = 5 when binned to R = 1000. This is approximately a factor of 3 worse than expected for the JWST NIRSpec instrument, but the NIRCam grisms provide better spatial resolution, better spectrophotometric precision, and complete field coverage. The grisms will be especially useful for high precision spectrophotometric observations of transiting exoplanets. We expect that R = 500 spectra of the primary transits and secondary eclipses of Jupiter-sized exoplanets can be acquired at moderate or high signal-to-noise for stars as faint as M = 10 - 12 mag in 1000 s of integration time, and even bright stars (V = 5 mag) should be observable without saturation. We also discuss briefly how these observations will open up new areas of exoplanet science and suggest other unique scientific applications of the grisms.

AB - The near-infrared camera (NIRCam) on the James Webb Space Telescope (JWST) will incorporate 2 identical grisms in each of its 2 long wavelength channels. These transmission gratings have been added to assist with the coarse phasing of the JWST telescope, but they will also be used for slitless wide-field scientific observations over selectable regions of the A = 2.4 - 5.0 μm. wavelength range at spectroscopic resolution R ≡ λ/δλX ≃ 2000. We describe the grism design details and their expected performance in NIRCam. The grisms will provide pointsource continuum sensitivity of approximately AB = 23 mag in 10,000 s exposures with S/N = 5 when binned to R = 1000. This is approximately a factor of 3 worse than expected for the JWST NIRSpec instrument, but the NIRCam grisms provide better spatial resolution, better spectrophotometric precision, and complete field coverage. The grisms will be especially useful for high precision spectrophotometric observations of transiting exoplanets. We expect that R = 500 spectra of the primary transits and secondary eclipses of Jupiter-sized exoplanets can be acquired at moderate or high signal-to-noise for stars as faint as M = 10 - 12 mag in 1000 s of integration time, and even bright stars (V = 5 mag) should be observable without saturation. We also discuss briefly how these observations will open up new areas of exoplanet science and suggest other unique scientific applications of the grisms.

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