Remapping Interferometry

Abstract. Pupil-remapping is a new high-dynamic range imag-ing technique that has recently demonstrated feasibility on sky. The current prototypes present however deceiving limiting magni-tude, restricting the current use to the brightest stars in the sky. We propose to combine pupil-remapping with spatio-spectral en-coding, a technique first applied to the VEGA/CHARA interferom-eter. The result is an instrument proposal, called ”Dividing Inter-ferometer for Stars Characterizations and Observations ” (DISCO). The idea is to take profit of wavelength multiplexing when using a spectrograph in order to pack as much as possible the available information, yet providing a potential boost of 1.5 magnitude if used in existing prototypes. We detail in this paper the potential of such a concept. 1