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We present an analysis of instrument performance using new observations takenwith the Coronagraphic High Angular Resolution Imaging Spectrograph (CHARIS)instrument and the Subaru Coronagraphic Extreme Adaptive Optics (SCExAO)system. In a correlation analysis of our datasets (which use the broadband modecovering J through K band in a single spectrum), we find that chromaticity inthe SCExAO/CHARIS system is generally worse than temporal stability. We alsodevelop a point spread function (PSF) subtraction pipeline optimized for theCHARIS broadband mode, including a forward modelling-based exoplanetalgorithmic throughput correction scheme. We then present contrast curves usingthis newly developed pipeline. An analogous subtraction of the same datasetsusing only the H band slices yields the same final contrasts as the full JHKsequences; this result is consistent with our chromaticity analysis,illustrating that PSF subtraction using spectral differential imaging (SDI) inthis broadband mode is generally not more effective than SDI in the individualJ, H, or K bands. In the future, the data processing framework and analysisdeveloped in this paper will be important to consider for additionalSCExAO/CHARIS broadband observations and other ExAO instruments which plan toimplement a similar integral field spectrograph broadband mode.

A Chromaticity Analysis and PSF Subtraction Techniques for SCExAO/CHARIS data