VIPER meets CRIRES+: Reaching 3 m/s in the NIR

During the last years, Radial Velocity (RV) measurements became an admired tool for the discovery and study of exoplanets, coming along with a number of new instruments and data reduction codes. One of these new instruments, which is meant to reach a RV precision of around 3 m/s in the NIR, is the updated CRyogenic high-resolution InfraRed Echelle Spectrograph (CRIRES+). In this context, I will present our data reduction code VIPER (Velocity and IP EstimatoR), which will be soon available as the official RV pipeline for CRIRES+. VIPER is based on the method as described in Butler et al. 1996, using imprinted cell lines as wavelength calibration. As the spectrum in the NIR is increasingly contaminated by telluric lines, additionally VIPER is able to model imprinted tellurics, as well as creating telluric-free stellar templates. Without the need of any additional telluric correction codes, VIPER allows a fast and easy way of RV estimation. To show its efficiency, I will present current results from the CRIRES+ commissioning and how we are able to reach a RV precision of a few m/s on short and long time scales in K-band.