Abstract Details

Name: Tanya Das
Affiliation: Indian Institute of Astrophysics
Conference ID: ASI2020_243
Title : Using a stabilized Fabry-Perot etalon for determining instrumental artifacts in a spectrograph
Authors and Co-Authors : Tanya Das, Ravinder K. Banyal, T. Sivarani
Abstract Type : Oral
Abstract Category : Instrumentation and Techniques
Abstract : Precision Doppler spectroscopy serves as an important tool for Radial Velocity (RV) measurements by observing Doppler shift in the spectrum of the star which can be used for various applications. For the spectrograph to measure small variations in Doppler shift, the wavelength calibration must be sufficiently stable during observation time. Passively stabilized Fabry-Perot (FP) etalon based wavelength calibration is one of the techniques used for Doppler spectroscopy. The FP is kept in a pressure and temperature stabilized environment for it to produce equispaced transmission lines. Since the lines are stable, they can be used to determine the instrumental artifacts of the spectrograph and hence analyze spectrograph performance. Knowledge of instrument effects also helps in better prediction of the wavelength calibration model for the spectrograph. We have tested a stabilized FP on VBT Echelle spectrograph and Hanle Echelle spectrograph (HESP) and have examined the spectrograph artifacts for both, which we will be presenting here.