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Astronomy First direct detection of an exoplanet by optical interferometry Astrometry and K -band spectroscopy of HR 8799 e
To date, infrared interferometry at best achieved contrast ratios of a few times $10^{-4}$ on bright targets. GRAVITY, with its dual-field mode, is now capable of high contrast observations, enabling the direct observation of exoplanets. We demonstrate the technique on HR8799, a young planetary system composed of four known giant …