Robust support for semi-automated reductions of Keck/NIRSPEC data using PypeIt

arXiv (Cornell University)

Abstract

We present a data reduction pipeline (DRP) for Keck/NIRSPEC built as an addition to the PypeIt Python package. The DRP is capable of reducing multi-order echelle data taken both before and after the detector upgrade in 2018. As part of developing the pipeline, we implemented major improvements to the capabilities of the PypeIt package, including manual wavelength calibration for multi-order data and new output product that returns a coadded spectrum order-by-order. We also provide a procedure for correcting telluric absorption in NIRSPEC data by using the spectra of telluric standard stars taken near the time of the science spectra. At high resolutions, this is often more accurate than modeling-based approaches.

Authors 10

1. Adolfo S. Carvalho

   California Institute of Technology

   Affiliation as printed

   Department of Astronomy ; California Institute of Technology ; Pasadena , CA 91125 , USA

2. Greg Doppmann

   W.M. Keck Observatory

   Affiliation as printed

   W. M. Keck Observatory , 65-1120 Mamalahoa Hwy , Kamuela , HI , USA

3. Kyle B. Westfall

   University of California, Santa Cruz · University of California Observatories

   Affiliation as printed

   University of California Observatories , University of California , Santa Cruz , 1156 High St. , Santa Cruz , CA 95064 , USA

4. Debora Pelliccia

   University of California, Santa Cruz · University of California Observatories

   Affiliation as printed

   University of California Observatories , University of California , Santa Cruz , 1156 High St. , Santa Cruz , CA 95064 , USA

5. Jason Xavier Prochaska
6. Joseph F. Hennawi Aachen Leiden Observatory

   Leiden University · University of California, Santa Barbara · Leiden Observatory

   Affiliation as printed

   Leiden Observatory , Leiden University , PO Box 9513 , 2300 RA Leiden , The Netherlands

   Physics Department , Broida Hall , University of California , Santa Barbara , CA 93106-9530 , USA

7. Frederick B. Davies

   Max Planck Institute for Astronomy

   Affiliation as printed

   Max-Planck-Institut für Astronomie , Königstuhl 17 , D-69117 Heidelberg , Germany

8. Max Brodheim

   W.M. Keck Observatory

   Affiliation as printed

   W. M. Keck Observatory , Waimea , HI 96743 , USA

9. Feige Wang

   University of Arizona · University of Michigan

   Affiliation as printed

   Department of Astronomy , University of Michigan , 1085 S. University Ave. , Ann Arbor , MI 48109 , USA

   Steward Observatory , University of Arizona , 933 N Cherry Avenue , Tucson , AZ 85721 , USA

10. Ryan Cooke

    Durham University

    Affiliation as printed

    Centre for Extragalactic Astronomy , Durham University , Durham , DH1 3LE , UK