Precise Modelling of Telluric Features in Astronomical Spectra

Details Precise Modelling of Telluric Features in Astronomical Spectra Precise Modelling of Telluric Features in Astronomical Spectra

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010msngr.142...21s&link_type=abstract

The Messenger, vol. 142, p. 21-24

Astronomy and Astrophysics

Astronomy

Scientific paper

Ground-based astronomical observations suffer from the disturbing effects of the Earth's atmosphere. Oxygen, water vapour and a number of atmospheric trace gases absorb and emit light at discrete frequencies, shaping observing bands in the near- and mid-infrared and leaving their fingerprints - telluric absorption and emission lines - in astronomical spectra. The standard approach of removing the absorption lines is to observe a telluric standard star: a time-consuming and often imperfect solution. Alternatively, the spectral features of the Earth's atmosphere can be modelled using a radiative transfer code, often delivering a satisfying solution that removes these features without additional observations. In addition the model also provides a precise wavelength solution and an instrumental profile.

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