Chromatic Drift of the Espresso Fabry-P\'erot Etalon
Tobias M. Schmidt, Bruno Chazelas, Christophe Lovis, Xavier Dumusque,, Fran\c{c}ois Bouchy, Francesco Pepe, Pedro Figueira, and Danuta Sosnowska

TL;DR
This study investigates the chromatic drift in the Espresso Fabry-Pérot interferometer over 2.5 years, revealing wavelength-dependent variations likely due to mirror aging, which can be measured and corrected with standard calibration methods.
Contribution
It provides the first detailed analysis of chromatic drift in the Espresso Fabry-Pérot, demonstrating its characteristics and potential correction techniques.
Findings
Chromatic drift amplitude of a few cm/s per day.
Quasi-oscillatory dependence on wavelength.
Possible cause: aging of dielectric mirror coatings.
Abstract
In the last decade, white-light illuminated Fabry-P\'erot interferometers wave been established as a widely used, relatively simple, reliable, and cost-effective way to precisely calibrate high-resolution echelle spectrographs. However, Terrien et al. (2021) recently reported a chromatic drift of the Fabry-P\'erot 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 usually assumed but in fact depends on wavelength. Here, we present a similar study of the Espresso Fabry-P\'erot interferometer. Using daily calibrations spanning a period of over 2.5 years, we also find clear evidence for a chromatic drift with an amplitude of a few cm/s per day that has a characteristic, quasi-oscillatory dependence on wavelength. We conclude that this effect is probably caused by an…
Peer Reviews
No public reviews on file for this paper yet. If you reviewed it on a platform where reviews are public (OpenReview, ICLR, NeurIPS, ICML), you can paste yours below so the community can read it here.
Videos
No videos yet. Explain this paper in a talk, walkthrough, or lecture? Add one.
