Chromatic drift of the Espresso Fabry-Pérot etalon

¹ Observatoire Astronomique de l’Université de Genève, Chemin Pegasi 51, Sauverny 1290, Switzerland
e-mail: tobias.schmidt@unige.ch
² European Southern Observatory, Alonso de Córdova 3107, Vitacura, Región Metropolitana, Chile
³ Instituto de Astrofísica e Ciências do Espaço, Universidade do Porto, CAUP, Rua das Estrelas, 4150-762 Porto, Portugal

Received: 4 February 2022
Accepted: 12 April 2022

Abstract

In the last decade, white-light illuminated Fabry-Pérot interferometers have been established as a widely used, relatively simple, reliable, and cost-effective way to precisely calibrate high-resolution echelle spectrographs. However, a recent study reported a chromatic drift of the Fabry-Pérot interferometer installed at the Habitable-zone Planet Finder spectrograph. In particular, they found that the variation of the etalon effective gap size is not achromatic, as has usually been assumed, but that, in fact, it depends on wavelength. Here, we present a similar study of the Espresso Fabry-Pérot interferometer. Using daily calibrations spanning a period of over 2.5 yr, we also find clear evidence for a chromatic drift with an amplitude of a few cm s⁻¹ per day with a characteristic, quasi-oscillatory dependence on wavelength. We conclude that this effect is probably caused by the aging of the dielectric mirror coatings and we expect that similar chromatic drifts might affect all Fabry-Pérot interferometers used for the calibration of astronomical spectrographs. However, we also demonstrate that the chromatic drift can be measured and, in principle, corrected using only standard calibrations based on hollow cathode lamp spectra.