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Journal of Astronomical Telescopes, Instruments, and Systems • Open Access

MuSCAT: a multicolor simultaneous camera for studying atmospheres of transiting exoplanets
Author(s): Norio Narita; Akihiko Fukui; Nobuhiko Kusakabe; Masahiro Onitsuka; Tsuguru Ryu; Kenshi Yanagisawa; Hideyuki Izumiura; Motohide Tamura; Tomoyasu Yamamuro

Paper Abstract

We report a development of a multicolor simultaneous camera for the 188-cm telescope at Okayama Astrophysical Observatory in Japan. The instrument, named MuSCAT (Multicolor Simultaneous Camera for studying Atmospheres of Transiting exoplanets), has a capability of three-color simultaneous imaging in optical wavelengths where CCDs are sensitive. MuSCAT is equipped with three 1024 × 1024 pixel CCDs which can be controlled independently. The three CCDs detect lights in g2 (400 to 550 nm), r2 (550 to 700 nm), and zs,2 (820 to 920 nm) bands using Astrodon Photometrics Generation 2 Sloan filters. The field of view of MuSCAT is 6.1×6.1  arc min2 with the pixel scale of 0.358  arc sec/pixel. The principal purpose of MuSCAT is to perform high-precision multicolor transit photometry. For this purpose, MuSCAT has the capability of self-autoguiding which enables it to fix the positions of stellar images within ∼1 pixel. We demonstrate relative photometric precisions of 0.101%, 0.074%, and 0.076% in g2, r2, and zs,2 bands, respectively, for GJ 436 (magnitudes in g=11.81, r=10.08, and z=8.66) with 30-s exposures. The achieved precisions meet our objective, and the instrument is ready for operation.

Paper Details

Date Published: 27 August 2015
PDF: 13 pages
J. Ast. Inst. Sys. 1(4) 045001 doi: 10.1117/1.JATIS.1.4.045001
Published in: Journal of Astronomical Telescopes, Instruments, and Systems Volume 1, Issue 4
Show Author Affiliations
Norio Narita, National Astronomical Observatory of Japan (Japan)
National Institutes of Natural Sciences (Japan)
The Graduate Univ. for Advanced Studies (Japan)
Akihiko Fukui, National Astronomical Observatory of Japan (Japan)
Nobuhiko Kusakabe, National Astronomical Observatory of Japan (Japan)
Masahiro Onitsuka, National Astronomical Observatory of Japan (Japan)
The Graduate Univ. for Advanced Studies (Japan)
Tsuguru Ryu, National Astronomical Observatory of Japan (Japan)
The Graduate Univ. for Advanced Studies (Japan)
Kenshi Yanagisawa, Okayama Astrophysical Observatory (Japan)
Hideyuki Izumiura, The Graduate Univ. for Advanced Studies (Japan)
Okayama Astrophysical Observatory (Japan)
Motohide Tamura, National Institutes of Natural Sciences (Japan)
National Astronomical Observatory of Japan (Japan)
The Univ. of Tokyo (Japan)
Tomoyasu Yamamuro, OptCraft (Japan)


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