MIRI APT Templates
A JWST observing program that uses the MIRI instrument is designed by using the one of the MIRI templates in the Astronomer's Proposal Tool (APT).
All JWST observations at wavelengths between 5 and 28.5 μm require the use of MIRI.
Step-by-step in APT
The step-by-step instructions for using the MIRI observing templates in the APT are provided in the following articles:
- MIRI Imaging APT Template
- MIRI LRS APT Template
- MIRI MRS APT Template
- MIRI Coronagraphic Imaging APT Template
The MIRI imaging mode offers broad-, medium- and narrowband imaging in a 75 × 113" FOV, or smaller FOVs if subarrays are used. The template provides a set of pre-defined dither patterns and mosaicing functionality for imaging of larger fields.
The MIRI low resolution spectroscopy (LRS) mode supports 5–10 µm single object slit and slitless spectroscopy at R ~ 100.
Full spectroscopic 5–28 μm coverage is offered using the MIRI medium resolution spectroscopy (MRS) mode. This is accomplished by observing simultaneously using 4 different integral field units (IFUs; channels 1–4) with fields of view spanning 3 × 3" to 7 × 7". Three consecutive spectral settings are required for full spectral coverage. The spectral resolving power ranges from R ~ 1,550–3,250, depending on wavelength. The MRS template supports a selection of dither patterns as well as mosaicing.
MIRI has 4 different coronagraphs for high-contrast imaging of faint companions or extended emission around a bright point source: three different 4-quadrant phase masks (4QPMs) and one Lyot mask. The FQPMs operate in 3 photometric bands at 10.65 μm, 11.40 μm, and 15.50 μm, while the Lyot operates at 23.00 μm.
Creating an APT observation
To create a new MIRI observation, choose an Observation Folder* in the tree editor and click Add in the active GUI window. This will add a generic observation to the folder and open an observation form. The observation can be assigned a unique number and a text label (which does not need to be unique). Select MIRI from the Instrument drop-down parameter field. This populates the Template drop-down field with the MIRI templates; select one of them to continue working on the specifics of the observation.
* Bold italics style indicates words that are also parameters or buttons in software tools (like the APT and ETC). Similarly, a bold style represents menu items and panels.
Information on all available options and restrictions for MIRI templates are available in the proposal parameters MIRI Templates articles.