SlideServe
Télécharger Obtenir Pro
Menu
Accueil Pro
Préférences
ApparenceLight Aide et commentaires
© SlideServe · v2026

Single-Object Slitless Spectroscopy with NIRISS

saima avatar
saima
12 diapositives · 307 Views · Jul 23, 2014

The James Webb Space Telescope (JWST) incorporates a redesigned mode for single-object grism spectroscopy using the NIRISS instrument. This new capability aims to study exoplanets around bright stars by observing their eclipses and extracting their spectra. Utilizing medium-resolution grism, the system achieves a resolution varying from ~300 to ~800 in the first order, covering wavelengths from 0.6 to 3 μm. Controlling systematic effects is pivotal for the successful extraction of high-quality exoplanet spectra, enhancing our understanding of these distant worlds.

#single-object slitless spectroscopy with niriss #single-object slitless spectroscopy with niriss ppt #powerpoint #presentation
Single-Object Slitless Spectroscopy with NIRISS - slide 1
01 / 12Single-Object Slitless Spectroscopy with NIRISS
1 / 17

Télécharger la présentation

Single-Object Slitless Spectroscopy with NIRISS
Une image / un lien ci-dessous est fourni (tel quel) pour télécharger la présentation

Politique de téléchargement : le contenu du site vous est fourni TEL QUEL pour votre information et votre usage personnel ; il ne peut être vendu, concédé sous licence ni partagé sur d’autres sites sans l’accord de son auteur.Le contenu vous est fourni TEL QUEL, pour votre information et votre usage personnel uniquement. Téléchargez la présentation en cliquant sur ce lien. Lors du téléchargement, si vous ne parvenez pas à télécharger une présentation, l’éditeur a peut-être supprimé le fichier de son serveur.Pendant le téléchargement, si vous ne parvenez pas à obtenir une présentation, le fichier a peut-être été supprimé par l’éditeur.

F I N

Plus de contenu associé

Transcription de la présentation

  1. JWST FGS Single-Object Slitless Spectroscopy with NIRISS Kevin Volk, STScI/ HIA With help from Loïc Albert (U. Montreal) TIPS Meeting, 18 April 2013

  2. Single-Object Grism Spectroscopy • In mid-2011 the TFI instrument was re-designed to NIRISS, and at that time a grism mode specific to exo-planet spectroscopy around bright stars was added. Unlike normal grism modes, it is intended for single objects. The goal is to observe stars known to have exo-planets in-eclipse and out-of-eclipse, and take the difference to extract the exo-planet spectrum. • A medium-resolution grism is used, with a prism to separate the orders: note that no blocking filter is used. • Estimated resolution λ/Δλ varies from ~300 to ~800 in 1st order, from 0.6 to 3 μm. • Control of systematic effects is going to be important for the exo-planet science. TIPS 18 April 2013

  3. Current Flight Grism (Bach Corp.) Recess Unruled Perimeter TIPS 18 April 2013

  4. NIRISS GR700XD Point Spread Function With weak lens: ~35 pixels wide in the cross-dispersion direction No lens (divided by 11) PSF simulations from David Lafernière (Montreal) TIPS 18 April 2013

  5. Flight (Bach) Grism Blaze Function TIPS 18 April 2013

  6. Spare (LLNL) Grism Blaze Function TIPS 18 April 2013

  7. The cross-dispersion direction is always (close to) along the y axis. Hence it is not perpendicular to the trace direction. order 0

  8. For brighter objects a 2048×256 pixel sub-array will be used to speed up the read-out. For the brightest objects a 2048×80 pixel sub-array will be used, sacrificing wavelength coverage for fast read-out. TIPS 18 April 2013

  9. GR700XD Bright Limit Estimates 2MASS J-band Magnitude Limits 10000 ADU/frame TIPS 18 April 2013

  10. TIPS 18 April 2013

  11. Final Remarks • The SOSS mode provides a unique and powerful capability for JWST exo-planet observations. • First light through the instrument will be later this year during ISIM CV1RR testing (nominally in the early fall). • Calibration of this mode will be challenging, particularly in terms of working to reduce the systematic effects – i.e. pixel-to-pixel variations, non-linearity effects, persistence, etc. – to achieve very high S/N in a series of spectra over a period of order 10 hours. TIPS 18 April 2013