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31
Mayo 2017

Cherenkov Telescope Arrays for Optical Astronomy: Intensity interferometry and imaging of stellar surfaces


Inicio: 12:00h
Ponente: Dainis Dravins (Lund Observatory)
Lugar: Sala Alberto Lobo

Optical imaging with microarcsecond resolution will reveal details on and around stellar surfaces but requires kilometer-scale interferometers.  Intensity interferometry, electronically connecting independent telescopes, has an error budget that relates to electronic time resolutions of nanoseconds…
Inicio: 12:00h
Ponente: Dainis Dravins (Lund Observatory)
Lugar: Sala Alberto Lobo

Optical imaging with microarcsecond resolution will reveal details on and around stellar surfaces but requires kilometer-scale interferometers.  Intensity interferometry, electronically connecting independent telescopes, has an error budget that relates to electronic time resolutions of nanoseconds and light-travel distances of centimeters or meters (rather than scales of an optical wavelength), circumventing issues of atmospheric turbulence.  Once pioneered by Hanbury Brown and Twiss, digital versions of this quantum-optical technique have now been demonstrated in the laboratory, reconstructing diffraction-limited images from measurements over hundreds of optical baselines.  Baselines up to a few km will soon become available with the Cherenkov Telescope Array (primarily built for gamma-ray studies), thus realizing an optical interferometer in software, somewhat analogous to that of ALMA at radio wavelengths.
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An institute of the Consejo Superior de Investigaciones Científicas

An institute of the Consejo Superior de Investigaciones Científicas
Affiliated with the Institut d'Estudis Espacials de Catalunya

Affiliated with the Institut d'Estudis Espacials de Catalunya