Extreme precision radial velocity with extreme-AO and photonics: challenges and opportunities

Olivier Guyon; Sébastien Vievard; Manon Lallement; Sergio Leon-Saval; Takayuki Kotani; Motohide Tamura; Vincent Deo; Julien Lozi; Rodrigo Amezcua-Correa; Stephanos Yerolatsitis; Sylvestre Lacour; Elsa Huby

doi:10.1117/12.3020860

28 August 2024 Extreme precision radial velocity with extreme-AO and photonics: challenges and opportunities

Olivier Guyon, Sébastien Vievard, Manon Lallement, Sergio Leon-Saval, Takayuki Kotani, Motohide Tamura, Vincent Deo, Julien Lozi, Rodrigo Amezcua-Correa, Stephanos Yerolatsitis, Sylvestre Lacour, Elsa Huby

Author Affiliations +

Proceedings Volume 13097, Adaptive Optics Systems IX; 1309719 (2024) https://doi.org/10.1117/12.3020860
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Abstract

Combining extreme-AO correction with single-mode fiber (SMF) spectroscopy is a promising approach for Extreme Precision Radial Velocity, possibly reaching the cm/s level required for identification of Earth analogs. SMF spectrographs however exhibit a RV bias error due to coupling between stellar rotation and spatially-variant coupling efficiency, with amplitudes reaching ~m/s level on large telescopes. We explore using a spectrally dispersed photonic lantern (PL) for simultaneous RV and WFS measurements, and calibrate the RV bias error using WFS telemetry. On-sky observations of the star Humu (Altair) at the Subaru Telescope with SCExAO have confirmed the RV bias effect at the expected 5 km/s amplitude. Using a 19-port PL and a R=4000 spectrograph, we have demonstrated PL-based calibration of the RV-bias to <200 m/s, approaching the photon noise limit. The ExAO+PL+spectrograph is a precursor to a RV instrument at higher spectral resolution.

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Olivier Guyon, Sébastien Vievard, Manon Lallement, Sergio Leon-Saval, Takayuki Kotani, Motohide Tamura, Vincent Deo, Julien Lozi, Rodrigo Amezcua-Correa, Stephanos Yerolatsitis, Sylvestre Lacour, and Elsa Huby "Extreme precision radial velocity with extreme-AO and photonics: challenges and opportunities", Proc. SPIE 13097, Adaptive Optics Systems IX, 1309719 (28 August 2024); https://doi.org/10.1117/12.3020860

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