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Exposure time calculator for APO/ARCES
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shocksgo: Simple Harmonic Oscillator celerite kernels for stellar granulation and oscillations
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Calculate S/N and exposure times for
stellar spectroscopy with the `ARC Echelle Spectrograph (ARCES)
<https://www.apo.nmsu.edu/arc35m/Instruments/ARCES/>`_ on the
`ARC 3.5 m Telescope <https://www.apo.nmsu.edu/arc35m/>`_ at
`Apache Point Observatory <https://www.apo.nmsu.edu>`_.

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.
Generate light curves of the Sun and stars accounting for the effects of granulation, supergranulation and p-mode oscillations.

For more information, `read the docs <https://arcesetc.readthedocs.io/>`_.

License
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