(Proposal ID) S17A-161 (PI) Jovanovic, Nemanja (Proposal Title) Characterization of Known Exoplanets with CHARIS (CHARIS PI proposal) (Abstract) While thousands of planets have now been discovered through a variety of means, we know very little about their atmospheres nor their formation history. Direct imaging is currently capable of characterizing giant planets at large distances (5 - 100 AU) from their stars, providing direct measurements of planet and atmosphere properties, unique tests of planet formation theory, and characterization of the outer regions of planetary systems. The new Subaru instrument CHARIS has the unique ability to obtain spectra of brown dwarf and planetary companions. This proposal is focused on obtaining spectra of exoplanets for which important wavelength ranges have poor or missing data. We propose to observe 51 Eri b, HR8799cde, HD131399Ab, GJ504, HR7672B, and kappa And b. These targets each need further spectral characterization which either has not been done or cannot be done by other instruments besides CHARIS. These measurements will provide new constraints on planetary atmosphere models and on planet masses that remain very uncertain.