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First Light for GRAVITY: Phase Referencing Optical Interferometry for the Very Large Telescope Interferometer
GRAVITY Collaboration, R. Abuter, M. Accardo +130
GRAVITY is a new instrument to coherently combine the light of the European Southern Observatory Very Large Telescope Interferometer to form a telescope with an equivalent 130 m di…
The metrology system of the VLTI instrument GRAVITY
Magdalena Lippa, Stefan Gillessen, Nicolas Blind +24
The VLTI instrument GRAVITY combines the beams from four telescopes and provides phase-referenced imaging as well as precision-astrometry of order 10 microarcseconds by observing t…
GRAVITY: the VLTI 4-beam combiner for narrow-angle astrometry and interferometric imaging
N. Blind, F. Eisenhauer, S. Gillessen +23
GRAVITY is the second generation Very Large Telescope Interferometer instrument for precision narrow-angle astrometry and interferometric imaging in the Near Infra-Red (NIR). It sh…
The GRAVITY instrument software / High-level software
Leonard Burtscher, Ekkehard Wieprecht, Thomas Ott +30
GRAVITY is the four-beam, near- infrared, AO-assisted, fringe tracking, astrometric and imaging instrument for the Very Large Telescope Interferometer (VLTI). It is requiring the d…
The GRAVITY metrology system: narrow-angle astrometry via phase-shifting interferometry
M. Lippa, N. Blind, S. Gillessen +26
The VLTI instrument GRAVITY will provide very powerful astrometry by combining the light from four telescopes for two objects simultaneously. It will measure the angular separation…
The fiber coupler and beam stabilization system of the GRAVITY interferometer
O. Pfuhl, M. Haug, F. Eisenhauer +20
We present the installed and fully operational beam stabilization and fiber injection subsystem feeding the 2nd generation VLTI instrument GRAVITY. The interferometer GRAVITY requi…
Alternative approach to precision narrow-angle astrometry for Antarctic long baseline interferometry
Y. Kok, M. J. Ireland, A. C. Rizzuto +4
The conventional approach to high-precision narrow-angle astrometry using a long baseline interferometer is to directly measure the fringe packet separation of a target and a nearb…
The GRAVITY metrology system: modeling a metrology in optical fibers
N. Blind, H. Huber, F. Eisenhauer +20
GRAVITY is the second generation VLT Interferometer (VLTI) instrument for high-precision narrow-angle astrometry and phase-referenced interferometric imaging. The laser metrology s…
GRAVITY: the Calibration Unit
N. Blind, F. Eisenhauer, M. Haug +19
We present in this paper the design and characterisation of a new sub-system of the VLTI 2nd generation instrument GRAVITY: the Calibration Unit. The Calibration Unit provides all…
The interferometric baselines and GRAVITY astrometric error budget
S. Lacour, F. Eisenhauer, S. Gillessen +9
GRAVITY is a new generation beam combination instrument for the VLTI. Its goal is to achieve microarsecond astrometric accuracy between objects separated by a few arcsec. This $10^…
Reaching micro-arcsecond astrometry with long baseline optical interferometry; application to the GRAVITY instrument
S. Lacour, F. Eisenhauer, S. Gillessen +10
A basic principle of long baseline interferometry is that an optical path difference (OPD) directly translates into an astrometric measurement. In the simplest case, the OPD is equ…
Phase-referenced Interferometry and Narrow-angle Astrometry with SUSI
Y. Kok, M. J. Ireland, P. G. Tuthill +4
The Sydney University Stellar Interferometer (SUSI) now incorporates a new beam combiner, called the Microarcsecond University of Sydney Companion Astrometry instrument (MUSCA), fo…
A low cost scheme for high precision dual-wavelength laser metrology
Yitping Kok, Michael J. Ireland, J. Gordon Robertson +3
A novel method capable of delivering relative optical path length metrology with nanometer precision is demonstrated. Unlike conventional dual-wavelength metrology which employs he…
Science and Technology Progress at the Sydney University Stellar Interferometer
J. Gordon Robertson, Michael J. Ireland, William J. Tango +6
This paper presents an overview of recent progress at the Sydney University Stellar Interferometer (SUSI). Development of the third-generation PAVO beam combiner has continued. The…
Simulating a dual beam combiner at SUSI for narrow-angle astrometry
Yitping Kok, Vicente Maestro, Michael J Ireland +2
The Sydney University Stellar Interferometer (SUSI) has two beam combiners, i.e. the Precision Astronomical Visible Observations (PAVO) and the Microarcsecond University of Sydney…