6 July 2018 SPHEREx: an all-sky NIR spectral survey
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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.
Conference Presentation
© (2018) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Phillip M. Korngut, Phillip M. Korngut, James J. Bock, James J. Bock, Rachel Akeson, Rachel Akeson, Matthew Ashby, Matthew Ashby, Lindsey Bleem, Lindsey Bleem, Justin Boland, Justin Boland, Douglas Bolton, Douglas Bolton, Samuel Bradford, Samuel Bradford, David Braun, David Braun, Sean Bryan, Sean Bryan, Peter Capak, Peter Capak, Tzu-Ching Chang, Tzu-Ching Chang, Andrew Coffey, Andrew Coffey, Asantha Cooray, Asantha Cooray, Brendan Crill, Brendan Crill, Olivier Doré, Olivier Doré, Tim Eifler, Tim Eifler, Chang Feng, Chang Feng, Salman Habib, Salman Habib, Katrin Heitmann, Katrin Heitmann, Shoubaneh Hemmati, Shoubaneh Hemmati, Christopher Hirata, Christopher Hirata, Woong-Seob Jeong, Woong-Seob Jeong, Minjin Kim, Minjin Kim, Davy Kirkpatrick, Davy Kirkpatrick, Theresa Kowalkowski, Theresa Kowalkowski, Elisabeth Krause, Elisabeth Krause, Carey Lisse, Carey Lisse, Philip Mauskopf, Philip Mauskopf, Daniel Masters, Daniel Masters, James McGuire, James McGuire, Gary Melnick, Gary Melnick, Hein Nguyen, Hein Nguyen, Hooshang Nayyeri, Hooshang Nayyeri, Karin Oberg, Karin Oberg, Roland dePutter, Roland dePutter, William Purcell, William Purcell, Jennifer Rocca, Jennifer Rocca, Marcus Runyan, Marcus Runyan, Karin Sandstrom, Karin Sandstrom, Roger Smith, Roger Smith, Yong-Seon Song, Yong-Seon Song, Nathaniel Stickley, Nathaniel Stickley, Jeremy Stober, Jeremy Stober, Sara Susca, Sara Susca, Harry Teplitz, Harry Teplitz, Volker Tolls, Volker Tolls, Stephen Unwin, Stephen Unwin, Michael Werner, Michael Werner, Rogier Windhorst, Rogier Windhorst, Michael Zemcov, Michael Zemcov, } "SPHEREx: an all-sky NIR spectral survey", Proc. SPIE 10698, Space Telescopes and Instrumentation 2018: Optical, Infrared, and Millimeter Wave, 106981U (6 July 2018); doi: 10.1117/12.2312860; https://doi.org/10.1117/12.2312860
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