SPHEREx: NASA's near-infrared spectrophotometric all-sky survey

Crill, B. P.; Werner, M. W.; Akeson, Rachel; Bleem, Lindsey; Bock, J. J.; Bryan, Sean; Burnham, Jill; Byunh, Joyce; Chang, Tzu-Ching; Chiang, Yi-Kuan; Cook, W. R.; Cooray, Asantha; Davis, A. J.; Doré, O.; Dowell, C. D.; Dubois-Felsmann, G. P.; Eifler, T. F.; Faisst, Andreas L.; Habib, Salman; Heinrich, Chen; Heitmann, Katrin; Heaton, G. S.; Hirata, Christopher M.; Hristov, V. V.; Hui, H.; Jeong, Woong Seob; Kang, J.; Kecman, B.; Kirkpatrick, J. Davy; Korngut, Phillip; Krause, E.; Lee, Bomee; Lisse, C. M.; Masters, D. C.; Mauskopf, Philip; Melnick, Gary J.; Miyasaka, Hiromasa; Nayyeri, Hooshang; Nguyen, Hien; Öberg, Karin I.; Padin, S.; Paladini, R.; Pourrahmani, Milad; Pyo, Jeonghyun; Smith, Roger; Song, Yong Seong; Symons, Teresa; Teplitz, Harry I.; Tolls, Volker; Unwin, S.; Windhorst, Rogier A.; Yang, Yujin; Zemcov, Michael

doi:10.1117/12.2567224

Cited by 13 publications

(3 citation statements)

References 12 publications

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“…All three mirrors in the SPHEREx telescope have a high-order Zernike freeform prescription [2][3] . The surface sag of each is plane-symmetric across the YZ-plane and defined by the summation of a spherical base curvature and Zernike terms.…”

Section: Mirrorsmentioning

confidence: 99%

“…The SPHEREx telescope is an F/3, telecentric, off-axis, "all-aluminum" freeform reflective triplet, with short-wave infrared (SWIR) and mid-wave infrared (MWIR) detection channels separated by a dichroic beam splitter (DBS) [1][2][3][4] . The telescope has an 11.3 x 3.5 deg full field of view (FOV), operates at cryogenic temperature and lacks a focus mechanism on either focal plane assembly (FPA).…”

Section: Introduction 11 Architecturementioning

confidence: 99%

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Opto-mechanical design, alignment, and test of the SPHEREx telescope: a cryogenic all-aluminum freeform system for the astrophysics medium explorer mission

Frater,

Seckar,

Wedmore

et al. 2023

UV/Optical/IR Space Telescopes and Instruments: Innovative Technologies and Concepts XI

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SPHEREx is a Medium Explorer astrophysics mission that requires a wide-field cryogenic short-wave infrared (SWIR) to mid-wave infrared (MWIR) telescope. The SPHEREx telescope has been designed and built at Ball Aerospace based on a JPL optical prescription and system architecture. The telescope has a 20cm entrance pupil, three freeform aluminum mirrors, a dichroic beam splitter furnished by Caltech, and forms two images in the SWIR and MWIR spectral bands. The "all-aluminum" architecture combined with a cryogenic space environment defines the opto-mechanical design approach for this system. Ball Aerospace performed developmental testing on a flight-like aluminum engineering development mirror for cryogenic surface figure and measured the differential thermal expansion of structural and optical aluminum materials. These development tests validated aspects of the athermal design prior to system-level integration and test. The telescope alignment process uses a laser tracker and system wavefront error (WFE) data to determine the adjustment of two mirrors and a focal plane assembly optical simulator (FPAOS). The FPAOS provides a retroreflection of interferometer light from each image location and an athermal focus position. The FPAOS was used in place of the SWIR band focal plane during system alignment and was moved to the MWIR focal plane interface to validate WFE performance in both bands. A cryogenic system WFE test was conducted to validate SWIR band performance at operational temperatures, and a post-vibrational WFE test demonstrates flight readiness. The SPHEREx telescope has been tested, delivered, and is ready for the next level of system integration.

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Section: Mirrorsmentioning

confidence: 99%

Section: Introduction 11 Architecturementioning

confidence: 99%

Opto-mechanical design, alignment, and test of the SPHEREx telescope: a cryogenic all-aluminum freeform system for the astrophysics medium explorer mission

Frater,

Seckar,

Wedmore

et al. 2023

UV/Optical/IR Space Telescopes and Instruments: Innovative Technologies and Concepts XI

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“…The Spectro-Photometer for the History of the Universe, Epoch of Reionization and Ices Explorer (SPHEREx) is a NASA Astrophysics Medium Class Explorer mission led by principal investigator Jamie Bock of the California Institute of Technology (Caltech). [1,2,3,4] The mission is a joint operation between NASA's Jet Propulsion Laboratory (JPL), Ball Aerospace, and the California Institute of Technology (Caltech) in collaboration with the Korean Astronomy and Space Science Institute (KASI). The instrument is jointly developed by JPL and Caltech with Ball Aerospace providing the spacecraft bus and JPL providing overall management of the mission.…”

Section: Introductionmentioning

confidence: 99%

Systems Engineering Approach for the SPHEREx Telescope Mission

Alibay,

Bottom,

Hutchinson

et al. 2023

INCOSE International Symp

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The Spectro‐Photometer for the History of the Universe, Epoch of Reionization and Ices Explorer (SPHEREx) was selected in 2019 as a NASA Astrophysics Medium Class Explorer mission to perform the first infrared all‐sky spectral survey. The mission consists of a single wide field of view telescope mounted on top of a Ball Configurable Platform (BCP) spacecraft bus. Over the course of its two‐year mission, the SPHEREx observatory will perform four all‐sky surveys and provide spectroscopic measurements of hundreds of millions of galaxies and a diversity of astronomical phenomena. SPHEREx is currently in phase C, post‐Critical Design Review (CDR) and is in the process of building and testing hardware in preparation for observatory Assembly, Test, and Integration (AI&T) in early 2024. The observatory is expected to launch on a Falcon 9 rocket no earlier than February 2025.Project level systems engineering support is provided by the Jet Propulsion Laboratory (JPL) and oversees the technical development of the observatory and its ground operations. Systems engineers are staffed throughout all the systems and act as a key interface between the mission's many partners. This paper focuses on the systems engineering approach for the SPHEREx mission including its architecture, verification and validation methodology, and its risk and resource management approach.

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Optimal constraints on Primordial non-Gaussianity with the eBOSS DR16 quasars in Fourier space

Cagliari,

Castorina,

Bonici

et al. 2024

J. Cosmol. Astropart. Phys.

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We present constraints on the amplitude of local Primordial Non-Gaussianities (PNG), f NL, using the quasar sample in the Sloan Digital Sky Survey IV extended Baryon Oscillation Spectroscopic Survey (eBOSS) Data Release 16 (DR16). We analyze the power spectrum monopole, testing for the presence of scale-dependent galaxy bias induced by local PNG. Our analysis makes use of optimal redshift weights that maximize the response of the quasar sample to the possible presence of non-zero PNG. We find -4 < f NL < 27 at 68% confidence level, which is among the strongest bounds with Large Scale Structure data. The optimal analysis reduces the error bar by ~10% compared to the standard one, but this improvement is lower than the one expected from previous forecasts. In addition, the larger volume of this dataset, when compared to previous releases of the eBOSS quasar catalog, does not always correspond to a reduction of the final uncertainty on local PNG. This could suggest the presence of still unknown systematic effects in the data. If the quasars have a lower response to local PNG, our optimal constraint becomes -23 < f NL < 21 at 68%, with an improvement of 30% over standard analyses. We also show how to use the optimal weights to put data-driven priors on the sample's response to local PNG.

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SPHEREx: NASA's near-infrared spectrophotometric all-sky survey

Cited by 13 publications

References 12 publications

Opto-mechanical design, alignment, and test of the SPHEREx telescope: a cryogenic all-aluminum freeform system for the astrophysics medium explorer mission

Opto-mechanical design, alignment, and test of the SPHEREx telescope: a cryogenic all-aluminum freeform system for the astrophysics medium explorer mission

Systems Engineering Approach for the SPHEREx Telescope Mission

Optimal constraints on Primordial non-Gaussianity with the eBOSS DR16 quasars in Fourier space

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