Single-mode interferometric field of view in partial turbulence correction. Application to the observation of the environment of Sgr A* with GRAVITY

Understand

Context.

• The GRAVITY instrument on the ESO VLTI is setting a new mark in the landscape of optical interferometers.
• Long exposures are possible for the first time in this wavelength domain, delivering a dramatic improvement for astrophysics.
• In particular, faint objects can be observed at the angular resolution of the VLTI, with exposures exceeding by many orders of magnitude the coherence time of atmospheric turbulence.