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SPHEREx: an all-sky NIR spectral survey
Author(s): Phillip M. Korngut; James J. Bock; Rachel Akeson; Matthew Ashby; Lindsey Bleem; Justin Boland; Douglas Bolton; Samuel Bradford; David Braun; Sean Bryan; Peter Capak; Tzu-Ching Chang; Andrew Coffey; Asantha Cooray; Brendan Crill; Olivier Doré; Tim Eifler; Chang Feng; Salman Habib; Katrin Heitmann; Shoubaneh Hemmati; Christopher Hirata; Woong-Seob Jeong; Minjin Kim; Davy Kirkpatrick; Theresa Kowalkowski; Elisabeth Krause; Carey Lisse; Philip Mauskopf; Daniel Masters; James McGuire; Gary Melnick; Hein Nguyen; Hooshang Nayyeri; Karin Oberg; Roland dePutter; William Purcell; Jennifer Rocca; Marcus Runyan; Karin Sandstrom; Roger Smith; Yong-Seon Song; Nathaniel Stickley; Jeremy Stober; Sara Susca; Harry Teplitz; Volker Tolls; Stephen Unwin; Michael Werner; Rogier Windhorst; Michael Zemcov
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Paper Abstract

SPHEREx, a mission in NASA’s Medium Explorer (MIDEX) program recently selected for Phase-A implementation, is an all-sky survey satellite that will produce a near-infrared spectrum for every 6 arcsecond pixel on the sky. SPHEREx has a simple, high-heritage design with large optical throughput to maximize spectral mapping speed. While the legacy data products will provide a rich archive of spectra for the entire astronomical community to mine, the instrument is optimized for three specific scientific goals: to probe inflation through the imprint primordial non-Gaussianity left on today’s large-scale cosmological structure; to survey the Galactic plane for water and other biogenic ices through absorption line studies; and to constrain the history of galaxy formation through power spectra of background fluctuations as measured in deep regions near the ecliptic poles. The aluminum telescope consists of a heavily baffled, wide-field off-axis reflective triplet design. The focal plane is imaged simultaneously by two mosaics of H2RG detector arrays separated by a dichroic beamsplitter. SPHEREx assembles spectra through the use of mass and volume efficient linear variable filters (LVFs) included in the focal plane assemblies, eliminating the need for any dispersive or moving elements. Instead, spectra are constructed through a series of small steps in the spacecraft attitude across the sky, modulating the location of an object within the FOV and varying the observation wavelength in each exposure. The spectra will cover the wavelength range between 0.75 and 5.0 µm at spectral resolutions ranging between R=35 and R=130. The entire telescope is cooled passively by a series of three V-groove radiators below 80K. An additional stage of radiative cooling is included to reduce the long wavelength focal plane temperature below 60K, controlling the dark current. As a whole, SPHEREx requires no new technologies and carries large technical and resource margins on every aspect of the design.

Paper Details

Date Published: 6 July 2018
PDF: 11 pages
Proc. SPIE 10698, Space Telescopes and Instrumentation 2018: Optical, Infrared, and Millimeter Wave, 106981U (6 July 2018); doi: 10.1117/12.2312860
Show Author Affiliations
Phillip M. Korngut, Caltech (United States)
James J. Bock, Caltech (United States)
Jet Propulsion Lab. (United States)
Rachel Akeson, IPAC, Caltech (United States)
Matthew Ashby, Harvard-Smithsonian CfA (United States)
Lindsey Bleem, Argonne National Lab. (United States)
Justin Boland, Jet Propulsion Lab. (United States)
Douglas Bolton, Jet Propulsion Lab. (United States)
Samuel Bradford, Jet Propulsion Lab. (United States)
David Braun, Jet Propulsion Lab. (United States)
Sean Bryan, Arizona State Univ. (United States)
Peter Capak, Caltech (United States)
Tzu-Ching Chang, Jet Propulsion Lab. (United States)
Andrew Coffey, Jet Propulsion Lab. (United States)
Asantha Cooray, Univ. of California, Irvine (United States)
Brendan Crill, Jet Propulsion Lab. (United States)
Olivier Doré, Jet Propulsion Lab. (United States)
Caltech (United States)
Tim Eifler, Jet Propulsion Lab. (United States)
Chang Feng, Univ. of California, Irvine (United States)
Salman Habib, Argonne National Lab. (United States)
Katrin Heitmann, Argonne National Lab. (United States)
Shoubaneh Hemmati, IPAC, Caltech (United States)
Christopher Hirata, Argonne National Lab. (United States)
Woong-Seob Jeong, Korea Astronomy and Space Science Institute (Korea, Republic of)
Minjin Kim, Korea Astronomy and Space Science Institute (Korea, Republic of)
Davy Kirkpatrick, IPAC, Caltech (United States)
Theresa Kowalkowski, Jet Propulsion Lab. (United States)
Elisabeth Krause, Jet Propulsion Lab. (United States)
Carey Lisse, JHU-APL, SES/SRE (United States)
Philip Mauskopf, Arizona State Univ. (United States)
Daniel Masters, Jet Propulsion Lab. (United States)
James McGuire, Jet Propulsion Lab. (United States)
Gary Melnick, Harvard-Smithsonian CfA (United States)
Hein Nguyen, Jet Propulsion Lab. (United States)
Hooshang Nayyeri, Univ. of California, Irvine (United States)
Karin Oberg, Harvard-Smithsonian CfA (United States)
Roland dePutter, Caltech (United States)
William Purcell, Ball Aerospace Corp. (United States)
Jennifer Rocca, Jet Propulsion Lab. (United States)
Marcus Runyan, Jet Propulsion Lab. (United States)
Karin Sandstrom, Univ. of California (United States)
Roger Smith, Caltech (United States)
Yong-Seon Song, Korea Astronomy and Space Science Institute (Korea, Republic of)
Nathaniel Stickley, IPAC, Caltech (United States)
Jeremy Stober, Ball Aerospace Corp. (United States)
Sara Susca, Jet Propulsion Lab. (United States)
Harry Teplitz, IPAC, Caltech (United States)
Volker Tolls, Harvard-Smithsonian CfA (United States)
Stephen Unwin, Jet Propulsion Lab. (United States)
Michael Werner, Jet Propulsion Lab. (United States)
Rogier Windhorst, Arizona State Univ. (United States)
Michael Zemcov, Rochester Institute of Technology (United States)
Jet Propulsion Lab. (United States)

Published in SPIE Proceedings Vol. 10698:
Space Telescopes and Instrumentation 2018: Optical, Infrared, and Millimeter Wave
Makenzie Lystrup; Howard A. MacEwen; Giovanni G. Fazio; Natalie Batalha; Nicholas Siegler; Edward C. Tong, Editor(s)

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