Using a passively stabilized Fabry-Perot etalon for determining instrumental artifacts in a spectrograph

Tanya Das; Ravinder K. Banyal; T. Sivarani; S. Sriram

doi:10.1117/12.2562007

13 December 2020 Using a passively stabilized Fabry-Perot etalon for determining instrumental artifacts in a spectrograph

Tanya Das, Ravinder K. Banyal, T. Sivarani, S. Sriram

Author Affiliations +

Proceedings Volume 11447, Ground-based and Airborne Instrumentation for Astronomy VIII; 1144748 (2020) https://doi.org/10.1117/12.2562007
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

Conference Poster

Abstract

Precision Doppler spectroscopy serves as an important tool for Radial Velocity (RV) measurements by observing Doppler shift in the stellar spectrum, which are used for various applications. 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 FP is stable and the line shape is invariant across wavelength pass band, they can be used to determine the spectrograph’s instrumental artifacts 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 passively stabilized FP on Vainu Bappu Telescope (VBT) Echelle spectrograph and Hanle Echelle spectrograph (HESP) and observed field curvature and distortion in both. We are analyzing the artifacts introduced and correcting for the same using image processing methods to compensate for the same in wavelength calibration model developed for the FP-based calibrator.

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Tanya Das, Ravinder K. Banyal, T. Sivarani, and S. Sriram "Using a passively stabilized Fabry-Perot etalon for determining instrumental artifacts in a spectrograph", Proc. SPIE 11447, Ground-based and Airborne Instrumentation for Astronomy VIII, 1144748 (13 December 2020); https://doi.org/10.1117/12.2562007

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