First demonstration of OH suppression in a high-efficiency near-infrared spectrograph

Author:

Ellis S C12ORCID,Bland-Hawthorn J23,Lawrence J S1,Horton A J1,Content R1,Roth M M4,Pai N1,Zhelem R1,Case S1,Hernandez E4,Leon-Saval S G23,Haynes R5,Min S S3,Giannone D4,Madhav K4,Rahman A4,Betters C3ORCID,Haynes D5,Couch W1,Kewley L J5,McDermid R6,Spitler L6,Sharp R G5,Veilleux S78

Affiliation:

1. Australian Astronomical Optics (AAO), Faculty of Science and Engineering, Macquarie University, Sydney, NSW 2109, Australia

2. Sydney Institute for Astronomy (SIfA), School of Physics A28, University of Sydney, Sydney, NSW 2006, Australia

3. Sydney Astrophotonic Instrumentation Labs (SAIL), School of Physics A28, University of Sydney, Sydney, NSW 2006, Australia

4. Leibniz-Institut für Astrophysik Potsdam, An der Sternwarte 16, D-14482 Potsdam, Germany

5. Research School of Astronomy and Astrophysics, Australian National University, Weston Creek, ACT 2611, Australia

6. Department of Physics and Astronomy, Macquarie University, Sydney, NSW 2109, Australia

7. Department of Astronomy, University of Maryland, College Park, MD 20742, USA

8. Joint Space-Science Institute, University of Maryland, College Park, MD 20742, USA

Abstract

ABSTRACT Ground-based near-infrared (NIR) astronomy is severely hampered by the forest of atmospheric emission lines resulting from the rovibrational decay of OH molecules in the upper atmosphere. The extreme brightness of these lines, as well as their spatial and temporal variability, makes accurate sky subtraction difficult. Selectively filtering these lines with OH suppression instruments has been a long standing goal for NIR spectroscopy. We have shown previously the efficacy of fibre Bragg gratings (FBGs) combined with photonic lanterns for achieving OH suppression. Here we report on PRAXIS, a unique NIR spectrograph that is optimized for OH suppression with FBGs. We show for the first time that OH suppression (of any kind) is possible with high overall throughput (18 per cent end-to-end), and provide examples of the relative benefits of OH suppression.

Funder

ARC

BMBF

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

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