SNAP: an integral field spectrograph for supernova identification

Ealet, A.; Prieto, Éric; Bonissent, A.; Malina, Roger F.; Basa, S.; LeFevre, Oliver; Mazure, A.; Tarlè, G.; Akerlof, C.; Aldering, G.; Amidei, D.; Astier, P.; Baden, A.; Bebek, C.; Bergstrom, L.; Bernstein, G. M.; Bower, C. R.; Campbell, M.; Carithers, W.; Commins, Eugene D.; Curtis, D. W.; Deustua, Susana E.; Edwards, W. R.; Ellis, Richard S.; Fruchter, A.; Frye, Brenda; Genat, J.F.; Goldhaber, G.; Goobar, A.; Goodman, J. A.; Graham, James R.; Hardin, D.; Harris, S.; Heetderks, H.; Honeycutt, R. K.; Holland, S.; Hook, I.; Huterer, Dragan; Kasen, Daniel; Kim, A.G.; Knop, R. A.; Lafever, R.; Lampton, M.; Levi, Michael; Levin, D.; Levy, J. M.; Lidman, C.; Lin, Ruqiu; Linder, Eric V.; Loken, S.; McKay, T. A.; Kee, S. P. Mc; Metzger, M.; Miquel, R.; Mourão, A.; Mufson, S.; Musser, J.; Nugent, P.; Pain, R.; Pankow, D.; Pennypacker, C. R.; Perlmutter, S.; Réfrégier, Alexandre; Rich, J.; Robinson, K.; Schahmanèche, K.; Schubnell,; Spadafora, A. L.; Smoot, G. F.; Sullivan, G.; Tomasch, A.

doi:10.1117/12.461216

Cited by 7 publications

(4 citation statements)

References 4 publications

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“…The spacecraft assembly provides electrical power, communication, attitude control, and propulsion for the observatory. The science instrument is comprised of the optical telescope assembly (OTA), focal plane array (FPA) 5,6 , FPA-mounted spectrograph 7,8,9 , main baffle, and instrument electronics. The OTA is a 2-meter aperture, three-mirror anastigmat (TMA) 10,11,12 .…”

Section: Introductionmentioning

confidence: 99%

Integrated modeling of point-spread function stability of the SNAP telescope

Besuner

Sholl

Lieber³

et al. 2007

SPIE Proceedings

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SNAP is a proposed space-based experiment designed to study dark energy and alternate explanations of the acceleration of the universe's expansion by performing a series of complementary systematic-controlled astrophysical measurements. The principal mission activities are the construction of an accurate Type Ia supernova Hubble diagram (the supernova program) and conducting a wide-area weak gravitational lensing (WL) survey. WL measurements require highly constant point spread function (PSF) second moments (ellipticity), and the aim of this study is to expand on the 2005 Sholl, et al. preliminary work, specifically via use of the Ball Aerospace integrated modeling tool, EOSyM (End-to-end Optical System Model). This modeling environment combines thermal, structural and optical effects, including alignment errors, manufacturing residuals and diffraction, in an integrated model of the telescope. Thermo-mechanically induced motions and deformations of the mirrors are modeled as well as other disturbances, and corresponding ellipticity variations of the PSF are quantified for typical operational scenarios. In this study, the effects of seasonal variations in solar flux, transients introduced when pointing the body-fixed Ka-band antenna toward Earth, 90˚ roll maneuvers (planned every three months of operations) and structure dimensional changes associated with composites desorption are quantified and introduced into the optical system. Uncertainty in the telescope ellipticity distribution may be reduced by examination of foreground stars within the field of view. Reference is made to ongoing work on the use of foreground stars in quantifying the PSF.

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Section: Introductionmentioning

confidence: 99%

Integrated modeling of point-spread function stability of the SNAP telescope

Besuner

Sholl

Lieber³

et al. 2007

SPIE Proceedings

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“…Since several years a research and development activity on image slicer system for integral field spectroscopy is conducted with already in-use instrumentations, such as GEMINI/GNIRS [1], and future applications for major groundbased (VLT second-generation instruments [3]) and space (JWST [4], SNAP [2]) observatories.…”

Section: Introductionmentioning

confidence: 99%

Modeling a slicer mirror using Zemax user-defined surface

Vivès¹,

Prieto²,

Moretto³

et al. 2006

New Astronomy Reviews

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A slicer mirror is a complex surface composed by many tilted and decentered mirrors sub-surfaces. The major difficulty to model such a complex surface is the large number of parameters used to define it. The Zemax's multi-configuration mode is usually used to specify each parameters (tilts, curvatures, decenters) for each mirror sub-surface which are then considered independently. Otherwise making use of the User-Defined Surface (UDS-DLL) Zemax capability, we are able to consider the set of sub-surfaces as a whole surface. In this paper, we present such a UDS-DLL tool comparing its performance with those of the classical multi-configuration mode. In particular, we explore the use of UDS-DLL to investigate the cross-talk due to the diffraction on the slicer array mirrors which has been a burden task when using multi-configuration mode.

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“…An integral field unit is used, implemented as an image slicer, to reduce the absolute pointing requirements of the satellite and to allow simultaneous measurement of the host galaxy spectra. Following this is a two-channel spectrometer to cover the wavelength range [21]. The image slicer technique is used in order to eliminate slit loss for spectrophotometry.…”

Section: Spectrographmentioning

confidence: 99%

SNAP satellite focal plane development

Bebek

Akerlof

Aldering

et al. 2003

UV/EUV and Visible Space Instrumentation for Astronomy II

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The proposed SuperNova/Acceleration Probe (SNAP) mission will have a two-meter class telescope delivering diffraction-limited images to an instrumented 0.7 square degree field in the visible and near-infrared wavelength regime. The requirements for the instrument suite and the present configuration of the focal plane concept are presented. A two year R&D phase, largely supported by the Department of Energy, is just beginning. We describe the development activities that are taking place to advance our preparedness for mission proposal in the areas of detectors and electronics.

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SNAP: an integral field spectrograph for supernova identification

Cited by 7 publications

References 4 publications

Integrated modeling of point-spread function stability of the SNAP telescope

Integrated modeling of point-spread function stability of the SNAP telescope

Modeling a slicer mirror using Zemax user-defined surface

SNAP satellite focal plane development

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