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The JWST NIRSpec integral field unit (IFU) presents a unique opportunity toobserve directly imaged exoplanets from 3-5um at moderate spectral resolution(R~2,700) and thereby better constrain the composition, disequilibriumchemistry, and cloud properties of their atmospheres. In this work, we presentthe first NIRSpec IFU high-contrast observations of a substellar companion thatrequires starlight suppression techniques. We develop specific data reductionstrategies to study faint companions around bright stars, and assess theperformance of NIRSpec at high contrast. First, we demonstrate an approach toforward model the companion signal and the starlight directly in the detectorimages, which mitigates the effects of NIRSpec's spatial undersampling. Wedemonstrate a sensitivity to planets that are 2e-6 fainter than their stars at1'', or 2e-5 at 0.3''. Then, we implement a reference star point spreadfunction (PSF) subtraction and a spectral extraction that does not requirespatially and spectrally regularly sampled spectral cubes. This allows us toextract a moderate resolution (R~2,700) spectrum of the faint T-dwarf companionHD~19467~B from 2.9-5.2um with signal-to-noise ratio (S/N)~10 per resolutionelement. Across this wavelength range, HD~19467~B has a flux ratio varyingbetween 1e-5-1e-4 and a separation relative to its star of 1.6''. A companionpaper by Hoch et al. more deeply analyzes the atmospheric properties of thiscompanion based on the extracted spectrum. Using the methods developed here,NIRSpec's sensitivity may enable direct detection and spectral characterizationof relatively old (~1Gyr), cool (~250K), and closely separated (~3-5au)exoplanets that are less massive than Jupiter.

JWST-TST High Contrast: Achieving direct spectroscopy of faint substellar companions next to bright stars with the NIRSpec IFU