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Gaia's potential for the discovery of circumbinary planets
Johannes Sahlmann, Amaury H. M. J. Triaud, David V. Martin
The abundance and properties of planets orbiting binary stars - circumbinary planets - are largely unknown because they are difficult to detect with currently available techniques.…
Enabling Gaia observations of naked-eye stars
J. Martín-Fleitas, A. Mora, J. Sahlmann +5
The ESA Gaia space astrometry mission will perform an all-sky survey of stellar objects complete in the nominal magnitude range G = [6.0 - 20.0]. The stars with G lower than 6.0, i…
Gaia on-board metrology: basic angle and best focus
A. Mora, M. Biermann, A. G. A. Brown +21
The Gaia payload ensures maximum passive stability using a single material, SiC, for most of its elements. Dedicated metrology instruments are, however, required to carry out two f…
Astrometric planet search around M8--L2 dwarfs from the ground and with Gaia
J. Sahlmann, P. F. Lazorenko, D. Segransan +4
Ultra-cool dwarfs are very low-mass stars or brown dwarfs and because of their faintness they are difficult targets for radial velocity and transit planet searches. High-precision…
Improving the astrometric performance of VLTI-PRIMA
J. Woillez, R. Abuter, L. Andolfato +18
In the summer of 2011, the first on-sky astrometric commissioning of PRIMA-Astrometry delivered a performance of 3 m'' for a 10 '' separation on bright objects, orders of magnitude…
Mid-infrared interferometry with K band fringe-tracking I. The VLTI MIDI+FSU experiment
A. Müller, J. -U. Pott, A. Mérand +11
Context: A turbulent atmosphere causes atmospheric piston variations leading to rapid changes in the optical path difference of an interferometer, which causes correlated flux loss…