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- W1644370178 abstract "We present the proposal for the infrared adaptive optics (AO) assisted, two-object, high-throughput, multiple-beam-combiner GRAVITY for the VLTI. This instrument will be optimized for phase-referenced interferometric imaging and narrow-angle astrometry of faint, red objects. Following the scientific drivers, we analyze the VLTI infrastructure, and subsequently derive the requirements and concept for the optimum instrument. The analysis can be summarized with the need for highest sensitivity, phase referenced imaging and astrometry of two objects in the VLTI beam, and infrared wavefront-sensing. Consequently our proposed instrument allows the observations of faint, red objects with its internal infrared wavefront sensor, pushes the optical throughput by restricting observations to K-band at low and medium spectral resolution, and is fully enclosed in a cryostat for optimum background suppression and stability. Our instrument will thus increase the sensitivity of the VLTI significantly beyond the present capabilities. With its two fibers per telescope beam, GRAVITY will not only allow the simultaneous observations of two objects, but will also push the astrometric accuracy for UTs to 10 μas, and provide simultaneous astrometry for up to six baselines." @default.
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- W1644370178 date "2007-10-11" @default.
- W1644370178 modified "2023-10-15" @default.
- W1644370178 title "GRAVITY: The AO-Assisted, Two-Object Beam-Combiner Instrument for the VLTI" @default.
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- W1644370178 doi "https://doi.org/10.1007/978-3-540-74256-2_50" @default.
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