Mission Concept Study for the 2020 US Astrophysics Decadal Survey:
The Latest Study Status of the Mid-infrared Spectrometer and Camera (MISC)
for the Origins Space Telescope (OST)
Itsuki Sakon,1 Thomas L.Roellig2, Kimberly Ennico2, Taro Matsuo3, Tomoyasu Yamamuro4,Yuji Ikeda5, and the MISC Instrument Study Team1

Department of Astronomy, Graduate School of Science, University of Tokyo,
7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
2
NASA Ames Research Center, Moffett Field, CA 94035, USA
3
Department of Earth and Space Science, Graduate School of Science, Osaka University, 1-1,Machikaneyamacho, Toyonaka, Osaka 560-0043, Japan
4Optocraft, 3-16-8-101, Higashi Hashimoto, Midori-ku, Sagamihara,Kanagawa 252-0144, Japan
5Photocoding, 460-102 Iwakura-Nakamachi, Sakyo-ku, Kyoto 606-0025, JapanThe Origins Space Telescope (OST; Meixner et al. 2018; Leisawitz et al. 2018) is one of thefour mission concepts studied for the 2020 US astrophysics decadal survey. The OST has twomission concepts; Mission concept 1 is composed of a cryogenically cooled 9.1 m off-axis
telescope and five instruments covering wavelengths from 5 to 660µm, while Mission
Concept 2 of a cryogenically cooled 5.9 m on-axis telescope with JWST-sized collecting areaand four instruments covering wavelengths from 5 to 660µm. The Mid-infrared Spectrometerand Camera (MISC; Sakon et al. 2018) is one of the instruments studied both for the Origins
Space Telescope (OST) Mission Concept 1 and 2 (cf., OSS, Bradford et al. 2018; FIP, Staguhn
et al. 2018; HERO, Wiedner al. 2018). The mid-infrared transit spectrometer (TRA) is theprimary function of the MISC instrument and is base-lined for the Concept 2 study. TheMISC TRA employs the densified pupil spectroscopic design (Matsuo et al. 2016) to achieve<5 ppm of spectro-photometric stability and covers 2.8-20 µm with R=50-300. The highest
ever spectro-photometric stability achieved by MISC TRA enables to detect bio-signatures(e.g., ozone, water, and methane) in habitable worlds in both primary and secondary transits
of exoplanets and makes the OST a powerful tool to bring a revolutionary progress in
exoplanet sciences. The mid-infrared wide-field imaging and low-resolution spectroscopic
function of the MISC instrument, which provides the OST not just with a focal plane guiding
function but also with a powerful tool to diagnose the physical and chemical condition of theISM using dust features, molecules lines and atomic and ionic lines, is also presented to theDecadal Review as an up-scoped version of the MISC instrument. In this presentation, I will
give a summary of the latest study status of the MISC instrument for the OST.
References[1]
Bradford, C. M., et al., “The Origins Survey Spectrometer (OSS): a far-IR discovery machine for theOrigins Space Telescope”, Proc. SPIE, 10698, in press (2018)[2]
Leisawitz, D. T., et al. “The Origins Space telescope: mission concept overview”, Proc. SPIE, 10698, inpress (2018)[3]
Matsuo, T., et al. “A New Concept for Spectrophotometry of Exoplanets with Space-borne Telescopes”,
ApJ, 823, 139 (2016)[4]
Meixner, M., et al. “Overview of the Origins Space telescope: science drivers to observatory
requirements”, Proc. SPIE, 10698, in press (2018)[5]
Sakon, I., et al. “Mid-Infrared Spectrometer and Camera (MISC) for the Origins Space Telescope”, Proc.
SPIE, 10698, in press (2018)[6]
Stagufn, J. G., et al. “Origins Space telescope: the far infrared imager and polarimeter FIP”, Proc. SPIE,10698, in press (2018)[7]
Wiedner, M. C., et al. “HERO: heterodyn receiver for the Origins Space telescope”, Proc. SPIE, 10698, inpress (2018)