Poster abstract details
Near infrared spectra and telluric absorption - How to deal with it?
Abstract
The absorption by the Earth's atmosphere is a major limiting factor for near-infrared spectroscopy. Correcting for this absorption is essential to characterize exoplanet atmospheres and derive precise radial velocity measurements in the near-infrared domain.
As computation of the atmospheric transmission is one of the many applications of the radiative transfer equation, the last few years have seen the development of several codes which produce a synthetic transmission spectra of the Earth's atmosphere at the time of the observations. These codes (Molecfit from Smette et al. 2015, TelFit from Gullikson et al. 2014 and TAPAS from Bertaux et al. 2014) make obsolete the use of telluric standard stars to correct for the telluric absorption. They are only made possible by the growing completeness of the molecular databases such as HITRAN, the use of radiative transfer code like LBLRTM and the availability of atmospheric profiles.
I will show, using CRIRES data, how the different codes perform the correction of the tellurics, which are the impacts of the different molecules and the level of absorption on the telluric correction.
As computation of the atmospheric transmission is one of the many applications of the radiative transfer equation, the last few years have seen the development of several codes which produce a synthetic transmission spectra of the Earth's atmosphere at the time of the observations. These codes (Molecfit from Smette et al. 2015, TelFit from Gullikson et al. 2014 and TAPAS from Bertaux et al. 2014) make obsolete the use of telluric standard stars to correct for the telluric absorption. They are only made possible by the growing completeness of the molecular databases such as HITRAN, the use of radiative transfer code like LBLRTM and the availability of atmospheric profiles.
I will show, using CRIRES data, how the different codes perform the correction of the tellurics, which are the impacts of the different molecules and the level of absorption on the telluric correction.