GRAVITY and the VLTI have transformed optical interferometry with groundbreaking results on the Galactic Center, active galactic nuclei, and exoplanets.
The GRAVITY+ project will upgrade GRAVITY and the VLTI in order to open up the extragalactic sky for milliarcsecond-resolution interferometric imaging, and give access to targets as faint as K = 22 mag. GRAVITY+ will measure the black hole masses of active galactic nuclei across cosmic time, and obtain high-quality exoplanet spectra and orbits.
GRAVITY+ will provide wide-field off-axis fringe tracking, and improved sensitivity and contrast from new natural guide star and laser guide star adaptive optics for all VLT 8 m unit telescopes. The GRAVITY+ upgrades can start immediately, and can be implemented incrementally, keeping the impact on operation to a minimum. They will add new, globally unique science capabilities with every step. As an infrastructure upgrade of the VLTI, GRAVITY+ will serve all present and future VLTI instruments along with their communities.
Following a summer 2020 recommendation by ESO’s STC, GRAVITY+ went through a Phase A process, which was successfully concluded in summer 2021, in order to become ESO’s next VLT facility instrument. GRAVITY+ will be built by a consortium including MPE, INSU/CNRS, University of Cologne, MPIA, CENTRA, and University of Southampton, in close collaboration with ESO.
Science cases for GRAVITY+ include:
- The Galactic Center
- Galaxy AGN coevolution and the masses of supermassive Black Holes, including super-Eddington accretion, tidal disruption events, and supermassive Black Hole binaries
- Characterization of exoplanets
- Young suns and their planet-forming disks
- Massive stars
- Intermediate-mass black holes
More information on the GRAVITY+ concept and science can be found in this document, which is based on the GRAVITY+ proposal to ESO.
- GRAVITY+ Phase A Review, July 9 to 12, 2021
- EAS lunch session "Taking infrared interferometry to the next level with GRAVITY+", June 29, 2021
GRAVITY+ community workshop, February 24 to 25, 2021
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