ExoTiC-MIRI

Custom steps for JWST MIRI LRS data reduction from raw data to light curves. Interoperable with the STScI pipeline.

The Space Telescope pipeline for JWST defines two main stages for the processing of raw observational data to a time series of 1D spectra.

  • Stage 1: starts from the _uncal.fits files and performs basic detector-level corrections at the group level. This is followed by ramp fitting to make _rateints.fits files, or rate-images. The dimensions of the data are transformed from [ints, groups, rows, cols] to [ints, rows, cols].

  • Stage 2: picks up the _rateints.fits files and performs mode-specific corrections on these rate-images. This is followed by extraction of the spectra to make light curves. The dimensions of the data are transformed from [ints, rows, cols] to [ints, wavelength].

In this package, we make available custom steps that can be swapped in and out of both stage 1 and stage 2 data processing. The custom steps provided are built specifically for reducing time-series observations from the Mid-Infrared Instrument’s low resolution spectrometer (MIRI LRS). This mode is of particular use to transiting exoplanet observations, and as such the algorithms are designed with precise relative fluxes in mind.

Acknowledgements

Built by David Grant, Daniel Valentine, Hannah Wakeford, and contributors.

If you make use of ExoTiC-MIRI in your research, see the citation page for info on how to cite this package. You can find other software from the Exoplanet Timeseries Characterisation (ExoTiC) ecosystem over on GitHub.