Temperature and humidity profiling radiometer for telluric absorption line correction

Alain Smette; Florian Kerber; Thomas Rose

doi:10.1117/12.2562675

13 December 2020 Temperature and humidity profiling radiometer for telluric absorption line correction

Alain Smette, Florian Kerber, Thomas Rose

Proceedings Volume 11449, Observatory Operations: Strategies, Processes, and Systems VIII; 114491H (2020) https://doi.org/10.1117/12.2562675
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

Abstract

Correction of telluric absorption lines is important during the data reduction of spectroscopic observations of astronomical targets. The popular tool Molecfit^{1, 2} creates synthetic telluric transmission spectra based on the LBLRTM radiative transfer code³, the HITRAN database4 , available atmospheric profiles (temperature, humidity, pressure variation with altitude), and instrumental line spread functions. Significantly improved accuracy is reached by using atmospheric profiles obtained at the same time and location as the science observations. For 9 years, a Low Humidity And Temperature Profiling (LHATPRO) Radiometer has provided profiles towards zenith every minute at Paranal. In 2019 line-of-sight support was added with the radiometer slaved to each telescope in sequence. This approach allows blind correction of water vapor telluric lines, provided some conditions are met, reducing the need to observe telluric stars.

Conference Presentation

Citation Download Citation

Alain Smette, Florian Kerber, and Thomas Rose "Temperature and humidity profiling radiometer for telluric absorption line correction", Proc. SPIE 11449, Observatory Operations: Strategies, Processes, and Systems VIII, 114491H (13 December 2020); https://doi.org/10.1117/12.2562675

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