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@ARTICLE{astropy:2018, | ||
author = {{The Astropy Collaboration} and {Price-Whelan}, A.~M. and | ||
{Sip{\'{o}}cz}, B.~M. and {G{\"u}nther}, H.~M. and {Lim}, P.~L. | ||
and {Crawford}, S.~M. and {Conseil}, S. and {Shupe}, D.~L. and | ||
{Craig}, M.~W. and {Dencheva}, N. and {Ginsburg}, A. and | ||
{VanderPlas}, J.~T. and {Bradley}, L.~D. and {P{\'e}rez- | ||
Su{\'a}rez}, D. and {de Val-Borro}, M. and {Aldcroft}, T.~L. and | ||
{Cruz}, K.~L. and {Robitaille}, T.~P. and {Tollerud}, E.~J. and | ||
{Ardelean}, C. and {Babej}, T. and {Bachetti}, M. and {Bakanov}, | ||
A.~V. and {Bamford}, S.~P. and {Barentsen}, G. and {Barmby}, P. | ||
and {Baumbach}, A. and {Berry}, K.~L. and {Biscani}, F. and | ||
{Boquien}, M. and {Bostroem}, K.~A. and {Bouma}, L.~G. and | ||
{Brammer}, G.~B. and {Bray}, E.~M. and {Breytenbach}, H. and | ||
{Buddelmeijer}, H. and {Burke}, D.~J. and {Calderone}, G. and | ||
{Cano Rodr{\'\i}guez}, J.~L. and {Cara}, M. and {Cardoso}, | ||
J.~V.~M. and {Cheedella}, S. and {Copin}, Y. and {Crichton}, D. | ||
and {D{\'A}vella}, D. and {Deil}, C. and {Depagne}, {\'E}. and | ||
{Dietrich}, J.~P. and {Donath}, A. and {Droettboom}, M. and | ||
{Earl}, N. and {Erben}, T. and {Fabbro}, S. and {Ferreira}, | ||
L.~A. and {Finethy}, T. and {Fox}, R.~T. and {Garrison}, L.~H. | ||
and {Gibbons}, S.~L.~J. and {Goldstein}, D.~A. and {Gommers}, R. | ||
and {Greco}, J.~P. and {Greenfield}, P. and {Groener}, A.~M. and | ||
{Grollier}, F. and {Hagen}, A. and {Hirst}, P. and {Homeier}, D. | ||
and {Horton}, A.~J. and {Hosseinzadeh}, G. and {Hu}, L. and | ||
{Hunkeler}, J.~S. and {Ivezi{\'c}}, {\v{Z}}. and {Jain}, A. and | ||
{Jenness}, T. and {Kanarek}, G. and {Kendrew}, S. and {Kern}, | ||
N.~S. and {Kerzendorf}, W.~E. and {Khvalko}, A. and {King}, J. | ||
and {Kirkby}, D. and {Kulkarni}, A.~M. and {Kumar}, A. and | ||
{Lee}, A. and {Lenz}, D. and {Littlefair}, S.~P. and {Ma}, Z. | ||
and {Macleod}, D.~M. and {Mastropietro}, M. and {McCully}, C. | ||
and {Montagnac}, S. and {Morris}, B.~M. and {Mueller}, M. and | ||
{Mumford}, S.~J. and {Muna}, D. and {Murphy}, N.~A. and | ||
{Nelson}, S. and {Nguyen}, G.~H. and {Ninan}, J.~P. and | ||
{N{\"o}the}, M. and {Ogaz}, S. and {Oh}, S. and {Parejko}, J.~K. | ||
and {Parley}, N. and {Pascual}, S. and {Patil}, R. and {Patil}, | ||
A.~A. and {Plunkett}, A.~L. and {Prochaska}, J.~X. and | ||
{Rastogi}, T. and {Reddy Janga}, V. and {Sabater}, J. and | ||
{Sakurikar}, P. and {Seifert}, M. and {Sherbert}, L.~E. and | ||
{Sherwood-Taylor}, H. and {Shih}, A.~Y. and {Sick}, J. and | ||
{Silbiger}, M.~T. and {Singanamalla}, S. and {Singer}, L.~P. and | ||
{Sladen}, P.~H. and {Sooley}, K.~A. and {Sornarajah}, S. and | ||
{Streicher}, O. and {Teuben}, P. and {Thomas}, S.~W. and | ||
{Tremblay}, G.~R. and {Turner}, J.~E.~H. and {Terr{\'o}n}, V. | ||
and {van Kerkwijk}, M.~H. and {de la Vega}, A. and {Watkins}, | ||
L.~L. and {Weaver}, B.~A. and {Whitmore}, J.~B. and {Woillez}, | ||
J. and {Zabalza}, V.}, | ||
title = "{The Astropy Project: Building an inclusive, open-science project and | ||
status of the v2.0 core package}", | ||
journal = {ArXiv e-prints}, | ||
keywords = {Astrophysics - Instrumentation and Methods for Astrophysics}, | ||
year = 2018, | ||
month = Jan, | ||
eid = {arXiv:1801.02634}, | ||
pages = {arXiv:1801.02634}, | ||
archivePrefix = {arXiv}, | ||
eprint = {1801.02634}, | ||
adsurl = {https://ui.adsabs.harvard.edu/#abs/2018arXiv180102634T}, | ||
adsnote = {Provided by the SAO/NASA Astrophysics Data System} | ||
} |
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--- | ||
title: 'arcesetc: ARC Echelle Spectroscopic Exposure Time Calculator' | ||
tags: | ||
- Python | ||
- astronomy | ||
- spectroscopy | ||
authors: | ||
- name: Brett M. Morris | ||
orcid: 0000-0003-2528-3409 | ||
affiliation: 1 | ||
- name: Trevor Dorn-Wallenstein | ||
orcid: 0000-0003-3601-3180 | ||
affiliation: 1 | ||
affiliations: | ||
- name: Astronomy Department, University of Washington, Seattle, WA, USA | ||
index: 1 | ||
date: 1 Jan 2019 | ||
bibliography: paper.bib | ||
--- | ||
|
||
# Summary | ||
|
||
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 estimates 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 | ||
coeffiecients. | ||
|
||
At present, the stellar spectral types included in the ``arcesetc`` library | ||
span from late F to early M stars on the main sequence, and one each of an | ||
O, B, and Wolf-Rayet star. Contributions from the community are welcome to | ||
expand the library to include other spectral types. | ||
|
||
``arcesetc`` was built from the Astropy package-template, and thus includes | ||
self-building documentation and continuous integration [@astropy:2018]. | ||
|
||
# Acknowledgements | ||
|
||
We acknowledge guidance from Suzanne L. Hawley and Emily Levesque, and the invaluable | ||
framework and dev team behind the astropy package-template. | ||
|
||
# References |