English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

The Near-Infrared Imager and Slitless Spectrograph (NIRISS) is the sciencemodule of the Canadian-built Fine Guidance Sensor (FGS) onboard the James WebbSpace Telescope (JWST). NIRISS has four observing modes: 1) broadband imagingfeaturing seven of the eight NIRCam broadband filters, 2) wide-field slitlessspectroscopy (WFSS) at a resolving power of $\sim$150 between 0.8 and 2.2$\mu$m, 3) single-object cross-dispersed slitless spectroscopy (SOSS) enablingsimultaneous wavelength coverage between 0.6 and 2.8 $\mu$m at R$\sim$700, amode optimized for exoplanet spectroscopy of relatively bright ($J<6.3$) starsand 4) aperture masking interferometry (AMI) between 2.8 and 4.8 $\mu$menabling high-contrast ($\sim10^{-3}-10^{-4}$) imaging at angular separationsbetween 70 and 400 milliarcsec for relatively bright ($M<8$) sources. Thispaper presents an overview of the NIRISS instrument, its design, its scientificcapabilities, and a summary of in-flight performance. NIRISS showssignificantly better response shortward of $\sim2.5\,\mu$m resulting in 10-40%sensitivity improvement for broadband and low-resolution spectroscopy comparedto pre-flight predictions. Two time-series observations performed duringinstrument commissioning in the SOSS mode yield very stable spectro-photometryperformance within $\sim$10% of the expected noise. The first space-basedcompanion detection of the tight binary star AB Dor AC through AMI wasdemonstrated.

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