List of workflow tasks

This is the list of all the tasks and associated recipes in the SPHERE-IRDIS workflow. Only some of them are needed for scientific reduction, they are indicated by the flag “yes” (triggered by default) or “optional” (triggered only if requested by a workflow parameter). Other tasks are not used for scientific reduction (they are indicated by the flag “no”), they are mainly used for instrument monitoring and they can be executed only by specifying them as target. Note that, when a task is specified as target, all the tasks that generate the calibrations needed for it are automatically executed.

TASK	RECIPE	Used in science reduction	Notes
irdis_coronagraph_center	sph_ird_star_center	yes (coronagraphic data)	Determines stellar position behind coronagraph using waffle images; outputs center table for registration.
irdis_dark_imaging	sph_ird_master_dark	yes	Creates MASTER_DARK by combining dark frames and produces hot/static bad-pixel map.
irdis_distortion_map	sph_ird_distortion_map	no	Derives geometric distortion solution via point-pattern matching; outputs polynomial distortion model.
irdis_flat_field	sph_ird_master_detector_flat	yes	Generates detector master flat; includes linearity fit and updated bad-pixel map.
irdis_instrument_background	sph_ird_ins_bg	yes	Produces instrumental background (INS_BG) used for subtraction when darks are unavailable.
irdis_science_flux_imaging	sph_ird_science_dbi	optional	Reduces off-axis flux frames for coronagraphic observations; not applied to final science calibration.
irdis_science_flux_polarimetry	sph_ird_science_dpi	optional	Flux reduction equivalent for DPI mode; output not used in science calibration.
irdis_science_imaging	sph_ird_science_dbi	yes (DBI/CI modes)	Main DBI science reduction with dark/background subtraction, flat-fielding, optional ADI/SDI.
irdis_science_polarimetry	sph_ird_science_dpi	yes (DPI mode)	Produces polarization (P) and intensity (I) products.
irdis_science_spectroscopy	sph_ird_science_spectroscopy	yes (LSS mode)	Reduces spectroscopy data via dark subtraction, flat-fielding, and frame combination.
irdis_sky_background	sph_ird_sky_bg	optional	Creates sky background (SKY_BG) calibration used for science background subtraction.
irdis_standard_astrometry_imaging	sph_ird_science_dbi	optional	Processes astrometric standard observations for calibration monitoring.
irdis_standard_flux_imaging	sph_ird_science_imaging	optional	Reduces photometric standards for zero-point calibration.
irdis_static_bad_pixel_map	sph_ird_master_dark	yes	Static bad pixels identified during master dark creation and propagated to later reductions.
irdis_wavecal_spectroscopy	sph_ird_wave_calib	yes (LSS only)	Computes wavelength solution and updates Pixel Description Table (PDT).

Notes

• For science tasks, backgrounds are associated in the following priority order: sky background, then internal background, then master dark.

• In DPI mode, the coronagraph-center association is constrained so that only suitable center frames taken before the science can be used.