Mar 17 – 21, 2019
Sunstar Hotel, Grindelwald, Switzerland
Europe/Zurich timezone

Is telluric correction required for precise radial velocities?

Mar 18, 2019, 5:00 PM
Sunstar Hotel, Grindelwald, Switzerland

Sunstar Hotel, Grindelwald, Switzerland

Dorfstrasse 168, 3818 Grindelwald Switzerland
Oral Telluric contamination Telluric contamination in EPRV


Dr Solene Ulmer-Moll (IA/U. Porto)


Stellar spectra are polluted with the absorption lines produced by the Earth's atmosphere. Earlier modeling work showed that a perfect telluric correction increases the radial velocity precision compared to masking the regions affected by telluric absorption. But what is the case for real observations? With CARMENES near-infrared spectra, I will show the impact of the telluric correction on the radial velocity precision effectively derived, before and after telluric correction using the synthetic transmission method Molecfit. I will discuss the advantages and limitations of the synthetic transmission methods. Finally, with ESPRESSO data, I will show the impact of the correction methods on the micro-telluric lines (< 2%) and their possible improvements.

Primary authors

Dr Solene Ulmer-Moll (IA/U. Porto) Dr Nuno Santos (IA/U. Porto) Dr Pedro Figueira (ESO and IA/U. Porto) Jason Neal (Centro de Astrofisica da Universidade do Porto)

Presentation materials