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Wide field Slitless Spectroscopy with JWST's MIRI

Andreea Petric, Sarah Kendrew, David Law, Alberto Noriega Crespo, Bryan Holler, Jane Morrison, Jonathan Aguilar, Misty Cracraft, Ian Wong, Stacey Alberts, Dean Hines, Kate Rowlands, Ned Molter, G. C. Sloan, Mike Engesser

astro-ph.IMarXiv:2608.15430

Abstract

We present a snapshot of the ongoing efforts to obtain background-subtracted, wavelength-, and flux-calibrated spectra taken with the new Wide-Field Slitless Spectroscopy (WFSS) mode for the MIRI instrument on the James Webb Space Telescope (JWST), offered for the first time in JWST Cycle 5 (starting July 2026). We describe here the capabilities of the new mode, the operational concept, and an overview of the calibration and pipeline development activities that are currently ongoing.

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