PRAXIS: an OH suppression optimised near infrared spectrograph

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

doi:10.1117/12.2539883

6 January 2020 PRAXIS: an OH suppression optimised near infrared spectrograph

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

Author Affiliations +

Proceedings Volume 11203, Advances in Optical Astronomical Instrumentation 2019; 1120312 (2020) https://doi.org/10.1117/12.2539883
Event: ANZCOP, 2019, Melbourne, Australia

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.

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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, and R. Zhelem "PRAXIS: an OH suppression optimised near infrared spectrograph", Proc. SPIE 11203, Advances in Optical Astronomical Instrumentation 2019, 1120312 (6 January 2020); https://doi.org/10.1117/12.2539883

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