NIRPS fiber-link design, performances and modal noise mitigation performances tested on sky

Yolanda G. C. Frensch; François Bouchy; Nicolas Blind; José Luis Rasilla; Frédérique Baron; René Doyon; Félix Gracia; Gaspare Lo Curto; Lison Malo; François Wildi

doi:10.1117/12.2630490

29 August 2022 NIRPS fiber-link design, performances and modal noise mitigation performances tested on sky

Yolanda G. C. Frensch, François Bouchy, Nicolas Blind, José Luis Rasilla, Frédérique Baron, René Doyon, Félix Gracia, Gaspare Lo Curto, Lison Malo, François Wildi

Author Affiliations +

Proceedings Volume 12184, Ground-based and Airborne Instrumentation for Astronomy IX; 1218451 (2022) https://doi.org/10.1117/12.2630490
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Conference Poster

Abstract

NIRPS (Near Infra-Red Planet Searcher) is an AO-assisted and fiber-fed high-resolution spectrograph operating in the YJH-bands at the ESO 3.6m telescope in La Silla Observatory, Chile. The optimal geometrical scrambling and the minimization of the modal noise, requested to reach 1 m s−1 precision in radial velocity, is obtained by combining octagonal fibers, a fiber stretcher, a double-scrambler, and a tip-tilt scanning of the 29-µm fiber core. We tested the performance of the fiber-link design on sky and evaluated the modal noise mitigation via near and far-field images taken at the fiber-link output. Without the inclusion of the stretcher and tip-tilt scanning, an extreme injection position at the edge of the fiber should induce an apparent change in radial velocity of ~20 m s−1 with respect to a well-centered injection. Observations with the entire instrument of fast-rotating hot stars show that the stretcher and tip-tilt scanning significantly reduce the modal noise from 1.6% to 0.7%. Optimizing the tip-tilt scanning pattern can further minimize the modal noise, thereby improving the precision in radial velocity.

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Yolanda G. C. Frensch, François Bouchy, Nicolas Blind, José Luis Rasilla, Frédérique Baron, René Doyon, Félix Gracia, Gaspare Lo Curto, Lison Malo, and François Wildi "NIRPS fiber-link design, performances and modal noise mitigation performances tested on sky", Proc. SPIE 12184, Ground-based and Airborne Instrumentation for Astronomy IX, 1218451 (29 August 2022); https://doi.org/10.1117/12.2630490

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