MuSCAT: a multicolor simultaneous camera for studying atmospheres of transiting exoplanets

Abstract

We report a development of a multi-color simultaneous camera for the 188cm telescope at Okayama Astrophysical Observatory in Japan. The instrument, named MuSCAT, has a capability of 3-color simultaneous imaging in optical wavelength where CCDs are sensitive. MuSCAT is equipped with three 1024x1024 pixel CCDs, which can be controlled independently. The three CCDs detect lights in $g_2^{\prime }$ (400--550 nm), $r_2^{\prime }$ (550--700 nm), and $z_{s,2}$ (820--920 nm) bands using Astrodon Photometrics Generation 2 Sloan filters. The field of view of MuSCAT is 6.1x6.1 arcmin${}^2$ with the pixel scale of 0.358 arcsec per pixel. The principal purpose of MuSCAT is to perform high precision multi-color transit photometry. For the purpose, MuSCAT has a capability of self autoguiding which enables to fix positions of stellar images within ~1 pix. We demonstrate relative photometric precisions of 0.101%, 0.074%, and 0.076% in $g_2^{\prime }$, $r_2^{\prime }$, and $z_{s,2}$ bands, respectively, for GJ436 (magnitudes in $g^{\prime }$=11.81, $r^{\prime }$=10.08, and $z^{\prime }$=8.66) with 30 s exposures. The achieved precisions meet our objective, and the instrument is ready for operation.

Published in Journal of Astronomical Telescopes, Instruments, and Systems (JATIS), open access version is available from http://astronomicaltelescopes.spiedigitallibrary.org/article.aspx?articleid=2432590

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