Intensity Interferometry at Calern and beyond: progress report

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 1 m diameter telescopes of the C2PU observatory, a portable 1 m diameter telescope, and also the 1.5 m 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.

References in corpus (7)

• Optical Intensity Interferometry with the Cherenkov Telescope Array
• Optical Intensity Interferometry with Atmospheric Cherenkov Telescope Arrays
• Temporal intensity interferometry: photon bunching on three bright stars
• Optical intensity interferometry observations using the MAGIC imaging atmospheric Cherenkov telescopes
• Spatial intensity interferometry on three bright stars
• Optical Multi-Channel Intensity Interferometry - or: How To Resolve O-Stars in the Magellanic Clouds
• Combined spectroscopy and intensity interferometry to determine the distances of the blue supergiants P Cygni and Rigel

Cited by in corpus (4)

• Intensity Interferometry observations of the H$\alpha$ envelope of $\gamma$ Cas with MéO and a portable telescope
• Field and intensity correlations: the Siegert relation from stars to quantum emitters
• Stellar intensity interferometry in the photon-counting regime
• Validating the Angular Sizes of Red Clump Stars with Intensity Interferometry