Multi-wavelength SimultaneouS High throughput Imager and polarimeter (MuSaSHI): development and its performance

Yumiko Oasa; Kazutoshi Ushioda; Yoshiki Shibata; Genta Seino; Masaru Kino; Hiroshi Akitaya

doi:10.1117/12.2560903

13 December 2020 Multi-wavelength SimultaneouS High throughput Imager and polarimeter (MuSaSHI): development and its performance

Yumiko Oasa, Kazutoshi Ushioda, Yoshiki Shibata, Genta Seino, Masaru Kino, Hiroshi Akitaya

Author Affiliations +

Proceedings Volume 11447, Ground-based and Airborne Instrumentation for Astronomy VIII; 114475Z (2020) https://doi.org/10.1117/12.2560903
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

Conference Poster

Abstract

We describe a development and performance evaluations for Mulit-wavelength SimultaneouS High throughput Imager and polarimeter called as ”MuSaSHI”. The science drivers are high-precision muticolor photometric stud- ies of time-variable astronomical phenomena such as variable stars, transiting planets and asteroids. MuSaSHI is designed to be mounted on the SaCRA telescope at Saitama University, dedicated for relatively wide ﬁeld imaging and polarimetry in the three optical bands (r: 550 to 680 nm, i: 700 to 810 nm, z: 820 to 1000 nm) . The instrument is equipped with three Back-Illuminated thinned e2v CCDs which provide simultaneous r, i, z images having a ﬁeld of view of 12.8 x 12.4 arcmin with a pixel scale of 0.73 arcsec. The optical system of MuSaSHI is composed of only two dichroic mirrors and three bandpass ﬁlters without lens, so that the total throughput is high especially at z band (~ 50%). In addition, the optics of MuSaSHI is designed for fast telescopes (F ~ 6.5) and with portability in mind so that it is able to be mounted on a larger aperture telescope with slower beam. The limiting magnitudes with 60 sec integration (10σ) are r_lim = 16.8, i_lim = 17.1, and z_lim = 17.2 mag. We demonstrate relative photometric precisions of < 0.1 % in the all bands for a K0 V star WASP-84 which hosts a transiting planet with 30s exposure observations.

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Yumiko Oasa, Kazutoshi Ushioda, Yoshiki Shibata, Genta Seino, Masaru Kino, and Hiroshi Akitaya "Multi-wavelength SimultaneouS High throughput Imager and polarimeter (MuSaSHI): development and its performance", Proc. SPIE 11447, Ground-based and Airborne Instrumentation for Astronomy VIII, 114475Z (13 December 2020); https://doi.org/10.1117/12.2560903

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