Calculate S/N and exposure times for stellar spectroscopy with the ARC Echelle Spectrograph (ARCES) on the ARC 3.5 m Telescope at Apache Point Observatory.
The ARC Echelle Spectroscopic (ARCES) Exposure Time Calculator, or arcesetc,
is a simple exposure time calculator for the ARCES instrument on the
Astrophysical Research Consortium (ARC) 3.5 m Telescope at Apache Point
Observatory for stellar spectroscopy. Users can supply arcesetc functions
with the spectral type of their target star, the V band magnitude, and either:
the desired exposure time in order to determine the counts and signal-to-noise
ratio as a function of wavelength; or the desired signal-to-noise ratio at a
given wavelength to determine the required exposure time.
We estimate the count rates for stars as a function of wavelength by fitting
15th-order polynomials to each spectral order of real observations of a star of
each spectral type. These polynomial coefficients and some wavelength metadata
are stored in an HDF5 archive for compactness and easy of reconstruction. Then
upon calling arcesetc, the archive is opened and the spectral order closest
to the wavelength of interest is reconstructed from the polynomial
coefficients, for a star of the closest available spectral type to the one
requested.
You can install arcesetc with pip:
pip install arcesetc
You can install arcesetc from the source code by doing the following:
git clone https://github.com/bmorris3/arcesetc.git cd arcesetc pip install .
arcesetc requires python >=3.5, numpy, astropy, h5py, and matplotlib.
For more information, read the docs.
This project is Copyright (c) Brett Morris & Trevor Dorn-Wallenstein and licensed under the terms of the MIT license. This package is based upon the Astropy package template which is licensed under the BSD 3-clause licence. See the licenses folder for more information.