The JWST/NIRSpec instrument: update on status and performances

Birkmann, Stephan M.; Ferruit, Pierre; Rawle, Tim; Sirianni, M.; Oliveira, Catarina Alves de; Giardino, G.; Lützgendorf, Nora; Marston, A. P.; Stuhlinger, M.; Plate, Maurice B. J. te; Jensen, Peter; Rumler, Peter; Dorner, Bernhard; Karl, Hermann; Mosner, Peter; Wright, Raymond H.; Rapp, Robert

doi:10.1117/12.2231837

Cited by 22 publications

(17 citation statements)

References 2 publications

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“…Symbol ( to a transmission signal of 121 ppm. The JWST instrument NIRSpec will uniquely be able to cover the near-infrared spectral range from 0.6 to 5.3 µm in one low resolution spectrum in 'PRISM mode' (Birkmann et al 2016). With a J-band magnitude of 10.8, WASP-169 is a perfect target for NIRSpec, expecting to achieving SNR 10 000 -25 000 per resolution element across the spectrum with one transit (Nielsen et al 2016;Batalha et al 2017).…”

Section: Parametermentioning

confidence: 99%

WASP-169, WASP-171, WASP-175, and WASP-182: three hot Jupiters and one bloated sub-Saturn mass planet discovered by WASP-South

Nielsen

Bouchy

Turner

et al. 2019

Monthly Notices of the Royal Astronomical Society

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Section: Parametermentioning

confidence: 99%

WASP-169, WASP-171, WASP-175, and WASP-182: three hot Jupiters and one bloated sub-Saturn mass planet discovered by WASP-South

Nielsen

Bouchy

Turner

et al. 2019

Monthly Notices of the Royal Astronomical Society

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“…1 The ISIM consists of 4 scientific instruments and a guider, and various structural, thermal, electronic, and operational systems that support them. The instruments are a Near Infrared Camera (NIRCam) 2,3 , a Near Infrared Spectrograph (NIRSpec) 4,5 , a Mid-Infrared Instrument (MIRI) 6,7 , and a Fine Guidance Sensor/Near Infrared Imager and Slitless Spectrograph (FGS/NIRISS) 8,9 . Together they encompass the wavelength range of 0.5 -28 um giving an unprecedented view of the universe at those wavelengths.…”

Section: Introductionmentioning

confidence: 99%

JWST cryo fine guidance closed loop test results

Vila

Lambros²,

Diaz

et al. 2018

Space Telescopes and Instrumentation 2018: Optical, Infrared, and Millimeter Wave

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Keywords: Fine Guiding, Closed Loop, Attitude Control, Pointing, Stability, Control, James Webb Space Telescope, Line of SightThe James Webb Space Telescope uses the Fine Guidance Controller to achieve pointing accuracy to a millionth of a degree needed for its scientific observations. This closed loop controller includes the Fine Guidance Sensor instrument, the Attitude Control System, and the Fine Steering Mirror, all working together to generate precise attitude updates every 64 ms to stabilize and point the Observatory. It was exercised for the first time with the flight hardware during the cryogenic test at Johnson Space Center. We provide a top level summary of the test, the results, and its performance in preparation for on-orbit operations.

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“…The first part of the problem can be solved either through the use of photonic lanterns [6,21], which split a multimode fibre into an array of SMFs at high efficiency, or through the use of extreme adaptive optics [35,36].…”

Section: Coupling To Astronomical Instrumentsmentioning

confidence: 99%

“…While NIR space telescopes completely avoid the problem of atmospheric emission, ground-based solutions are also desirable: space telescopes have a finite lifetime and are expensive to replace; ground-based facilities can take advantage of developments in technology and scientific understanding and allow for the optimisation of instruments for specific requirements as the need arises. Furthermore, in the case of JWST the field-of-view of the NIRSPEC instrument is 3.6 × 3.4 arcmin [6], significantly limiting its ability to perform large surveys. Additionally, space-based observatories are often significantly more over-subscribed than ground-based facilities, leading to significant restrictions in the proportion of researchers able to take advantage of such resources.…”

Section: Introductionmentioning

confidence: 99%

Photonic ring resonator filters for astronomical OH suppression

Ellis¹,

Kuhlmann²,

Kuêhn³

et al. 2017

Opt. Express

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Ring resonators provide a means of filtering specific wavelengths from a waveguide, and optionally dropping the filtered wavelengths into a second waveguide. Both of these features are potentially useful for astronomical instruments.In this paper we focus on their use as notch filters to remove the signal from atmospheric OH emission lines from astronomical spectra, however we also briefly discuss their use as frequency combs for wavelength calibration and as drop filters for Doppler planet searches.We derive the design requirements for ring resonators for OH suppression from theory and finite difference time domain simulations. We find that rings with small radii (< 10 µm) are required to provide an adequate free spectral range, leading to high index contrast materials such as Si and Si 3 N 4 . Critically coupled rings with high self-coupling coefficients should provide the necessary Q factors, suppression depth, and throughput for efficient OH suppression.We report on our progress in fabricating both Si and Si 3 N 4 rings for OH suppression, and give results from preliminary laboratory tests. Our early devices show good control over the free spectral range and wavelength separation of multi-ring devices. The self-coupling coefficients are high (> 0.9), but further optimisation is required to achieve higher Q and deeper notches, with current devices having Q ≈ 4000 and ≈ 10 dB suppression. The overall prospects for the use of ring resonators in astronomical instruments is promising, provided efficient fibre-chip coupling can be achieved.

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The JWST/NIRSpec instrument: update on status and performances

Cited by 22 publications

References 2 publications

WASP-169, WASP-171, WASP-175, and WASP-182: three hot Jupiters and one bloated sub-Saturn mass planet discovered by WASP-South

WASP-169, WASP-171, WASP-175, and WASP-182: three hot Jupiters and one bloated sub-Saturn mass planet discovered by WASP-South

JWST cryo fine guidance closed loop test results

Photonic ring resonator filters for astronomical OH suppression

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