Intensity interferometry at Calern and beyond: progress report

Nolan Matthews; Jean-Pierre Rivet; Mathilde Hugbart; Guillaume Labeyrie; Robin Kaiser; Olivier Lai; Farrokh Vakili; David Vernet; Julien Chabé; Clémont Courde; Nicolas Schuhler; Pierre Bourget; William Guerin

doi:10.1117/12.2628561

26 August 2022 Intensity interferometry at Calern and beyond: progress report

Nolan Matthews, Jean-Pierre Rivet, Mathilde Hugbart, Guillaume Labeyrie, Robin Kaiser, Olivier Lai, Farrokh Vakili, David Vernet, Julien Chabé, Clémont Courde, Nicolas Schuhler, Pierre Bourget, William Guerin

Author Affiliations +

Proceedings Volume 12183, Optical and Infrared Interferometry and Imaging VIII; 121830G (2022) https://doi.org/10.1117/12.2628561
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Abstract

We present the current status of the I2C stellar intensity interferometer used towards high angular resolution observations of stars in visible wavelengths. In these proceedings, we present recent technical improvements to the instrument, and share results from ongoing campaigns using arrays of small diameter optical telescopes. A tip-tilt adaptive optics unit was integrated into the optical system to stabilize light injection into an optical fiber. The setup was successfully tested with several facilities on the Calern Plateau site of the Observatoire de la Côte d’Azur. These include one of the 1m diameter telescopes of the C2PU observatory, a portable 1m diameter telescope, and also the 1.5m MéO telescope. To better constrain on-sky measurements, the spectral transmission of instrument was characterized in the laboratory using a high resolution spectrograph. The system was also tested with two of the auxiliary telescopes of the VLTI resulting in successful temporal and spatial correlation measurements of three stars.

Conference Presentation

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Nolan Matthews, Jean-Pierre Rivet, Mathilde Hugbart, Guillaume Labeyrie, Robin Kaiser, Olivier Lai, Farrokh Vakili, David Vernet, Julien Chabé, Clémont Courde, Nicolas Schuhler, Pierre Bourget, and William Guerin "Intensity interferometry at Calern and beyond: progress report", Proc. SPIE 12183, Optical and Infrared Interferometry and Imaging VIII, 121830G (26 August 2022); https://doi.org/10.1117/12.2628561

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