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PRAXIS: an OH suppression optimised near infrared spectrograph
Author(s): S. C. Ellis; J. Bland-Hawthorn; S. Bauer; S. Case; R. Content; T. Fechner; D. Giannone; R. Haynes; E. Hernandez; A. J. Horton; U. Klauser; J. S. Lawrence; S. G. Leon-Saval; H.-G. Löhmannsröben; S.-S. Min; N. Pai; M. Roth; L. Waller; R. Zhelem
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Paper Abstract

The problem of atmospheric emission from OH molecules is a long standing problem for near-infrared astronomy. We are now close to solving this problem for the first time with the PRAXIS instrument. PRAXIS is a unique spectrograph which is fed by fibres that remove the OH background, and is optimised specifically to benefit from OH-Suppression. The OH suppression is achieved with fibre Bragg gratings, which were tested successfully on the GNOSIS instrument. The OH lines are suppressed by a factor of ~1000, leading to a reduction of the integrated background of a factor ≈9. A future upgrade to multicore fibre Bragg gratings will further increase this reduction. PRAXIS has had two commissioning runs, with a third commissioning run planned for July 2019, which will be presented at the conference. PRAXIS has a measured throughput of ≈20 %, demonstrating high efficiency in an OH suppression instrument for the first time. Science verification observations of Seyfert galaxies demonstrate the potential of OH suppression.

Paper Details

Date Published: 6 January 2020
PDF: 2 pages
Proc. SPIE 11203, Advances in Optical Astronomical Instrumentation 2019, 1120312 (6 January 2020); doi: 10.1117/12.2539883
Show Author Affiliations
S. C. Ellis, Macquarie Univ. (Australia)
J. Bland-Hawthorn, The Univ. of Sydney (Australia)
S. Bauer, Leibniz-Institut für Astrophysik Potsdam (Germany)
S. Case, Macquarie Univ. (Australia)
R. Content, Macquarie Univ. (Australia)
T. Fechner, Leibniz-Institut für Astrophysik Potsdam (Germany)
D. Giannone, Leibniz-Institut für Astrophysik Potsdam (Germany)
R. Haynes, Leibniz-Institut für Astrophysik Potsdam (Germany)
E. Hernandez, Leibniz-Institut für Astrophysik Potsdam (Germany)
A. J. Horton, Macquarie Univ. (Australia)
U. Klauser, Macquarie Univ. (Australia)
J. S. Lawrence, Macquarie Univ. (Australia)
S. G. Leon-Saval, The Univ. of Sydney (Australia)
H.-G. Löhmannsröben, Univ. Potsdam (Germany)
S.-S. Min, The Univ. of Sydney (Australia)
N. Pai, Macquarie Univ. (Australia)
M. Roth, Leibniz-Institut für Astrophysik Potsdam (Germany)
L. Waller, Macquarie Univ. (Australia)
R. Zhelem, Macquarie Univ. (Australia)


Published in SPIE Proceedings Vol. 11203:
Advances in Optical Astronomical Instrumentation 2019
Simon C. Ellis; Céline d'Orgeville, Editor(s)

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