On the telluric correction of KMOS spectra

Coccato, Lodovico; Freudling, Wolfram; Smette, Alain; Sani, Eleonora; Escartin, Jose A.; Jung, Yves; Bazin, Gurvan

doi:10.18727/0722-6691/5148

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On the telluric correction of KMOS spectra

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Escartin, Jose A.
Optical and Interpretative Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

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Citation

Coccato, L., Freudling, W., Smette, A., Sani, E., Escartin, J. A., Jung, Y., et al. (2019). On the telluric correction of KMOS spectra. The Messenger, 177, 14-18. doi:10.18727/0722-6691/5148.

Cite as: https://hdl.handle.net/21.11116/0000-0005-1F92-4

Abstract

The presence of strong absorption lines in the atmospheric transmission spectrum affects spectroscopic observations, in particular those in the near- and mid-infrared. Therefore, there is the need to correct scientific observations for this effect, a process known as telluric correction. The use of a detailed model of the atmospheric transmission spectrum brings several advantages over the method of empirically deriving corrections using observations of a telluric standard star. In this paper, we discuss and compare the two methods applied to K-band Multi-Object Spectrograph (KMOS) observations and show the improvements in the quality of the final products obtained by implementing the modelling technique offered by the ESO molecfit sky tool.