nils-erik / iris_snr_sim

Simple TMT IRIS ETC based on IRIS simulator. It calculates the (1) exposure time to reach a specific S/N and (2) S/N for a given exposure time

TMT IRIS ETC

Simple TMT IRIS ETC based on IRIS simulator (see ). It calculates the (1) exposure time to reach a specific S/N and (2) S/N for a given exposure time.

Authors: Greg Walth (Carnegie Observatories), Arun Surya (UC San Diego), Nils Rundquist (UC San Diego) Contributors: Andrey Vayner (UC San Diego)

Requirements:

• Python 2.7
• Numpy
• Scipy
• Astropy
• Photutils 0.4
• Matplotlib

Additional requirements:

IRIS_ancillary_files.tar.gz which is contains the following directories; psfs, model_spectra and skyspectra. The directories contain binary files for the IRIS ETC calculation.

Installation and setup:

Set the simdir in the config.ini to directory that contains the PSFs and ancillary data.

The expected directory structure within the simdir is the following:

psfs

model_spectra

skyspectra

info

Usage examples:

Imager mode

iris_snr_sim.py -mag 20.0 -filter K -scale 0.004 -mode imager -calc snr -nframes 2

iris_snr_sim.py -mag 20.0 -filter K -scale 0.004 -mode imager -calc exptime -snr 10

IFS mode

Case 1 (Vega or Flat spectrum)

iris_snr_sim.py -mag 20.0 -filter K -scale 0.004 -mode IFS -calc exptime -snr 50.0

iris_snr_sim.py -mag 20.0 -filter K -scale 0.004 -mode IFS -calc snr -nframes 1 -spectrum Vega

iris_snr_sim.py -mag 20.0 -filter K -scale 0.004 -mode IFS -calc exptime -snr 10 -spectrum Vega

Case 2 (Emission line spectrum)

iris_snr_sim.py -mag 20.0 -filter K -scale 0.004 -mode IFS -calc snr -nframes 1 -spectrum Emission -line-width 100 -wavelength 2.15

iris_snr_sim.py -mag 20.0 -filter K -scale 0.004 -mode IFS -calc exptime -snr 10 -spectrum Emission -line-width 100 -wavelength 2.15

PSFs

Imager mode

iris_snr_sim.py -mag 20.0 -filter K -scale 0.004 -mode imager -calc snr -nframes 2 -zenith-angle 45 -atm-cond 75 -psf-loc 0.6 12.

IFS mode

iris_snr_sim.py -mag 20.0 -filter K -scale 0.004 -mode IFS -calc exptime -snr 50.0 -zenith-angle 30 -atm-cond 25 -psf-loc 0. 0.

Extended object mode

iris_snr_sim.py -mag 20.0 -filter K -scale 0.004 -source extended -mode imager -calc snr -nframes 2 -zenith-angle 45 -atm-cond 75 -psf-loc 0.6 12.

Plots in png format and IFS data in csv format

iris_snr_sim.py -mag 20.0 -filter K -scale 0.004 -source extended -mode imager -calc snr -nframes 2 -zenith-angle 45 -atm-cond 75 -psf-loc 0.6 12. -csv dump.csv -o plot.png