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Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
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21 papers · 2 filters
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…
Transiting exoplanets and magnetic spots characterized with optical interferometry
R. Ligi, D. Mourard, A. -M. Lagrange +2
Stellar activity causes difficulties in the characterization of transiting exoplanets. Studies have been performed to quantify its impact on infrared interferometry, but not in the…
PILOT: a balloon-borne experiment to measure the polarized FIR emission of dust grains in the interstellar medium
R. Misawa, J-Ph. Bernard, P. Ade +26
Future cosmology space missions will concentrate on measuring the polarization of the Cosmic Microwave Background, which potentially carries invaluable information about the earlie…
Compensation of high-order quasi-static aberrations on SPHERE with the coronagraphic phase diversity (COFFEE)
B. Paul, J. -F. Sauvage, L. M. Mugnier +6
The second-generation instrument SPHERE, dedicated to high-contrast imaging, will soon be in operation on the European Very Large Telescope. Such an instrument relies on an extreme…
Astrophotonic micro-spectrographs in the era of ELTs
N. Blind, E. Le Coarer, P. Kern +1
The next generation of Extremely Large Telescopes (ELT), with diameters up to 39 meters, will start opera- tion in the next decade and promises new challenges in the development of…
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…
Planetary Science Virtual Observatory architecture
S. Erard, B. Cecconi, P. Le Sidaner +11
In the framework of the Europlanet-RI program, a prototype of Virtual Observatory dedicated to Planetary Science was defined. Most of the activity was dedicated to the elaboration…
CubeSats as pathfinders for planetary detection: the FIRST-S satellite
S. Lacour, V. Lapeyrère, L. Gauchet +6
The idea behind FIRST (Fibered Imager foR a Single Telescope) is to use single-mode fibers to combine multiple apertures in a pupil plane as such as to synthesize a bigger aperture…
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^…
Imaging and nulling properties of sparse-aperture Fizeau interferometers
F. Henault
In this communication are presented rigorous and approximate analytical expressions of the Point Spread Function (PSF) and Field of View (FoV) achievable by multi-aperture Fizeau i…
Metrology calibration and very high accuracy centroiding with the NEAT testbed
A. Crouzier, F. Malbet, O. Preis +19
NEAT is an astrometric mission proposed to ESA with the objectives of detecting Earth-like exoplanets in the habitable zone of nearby solar-type stars. NEAT requires the capability…
Cheapest nuller in the world: Crossed beamsplitter cubes
F. Henault, A. Spang
In this communication is described a new type of Achromatic phase shifter (APS) suitable for both nulling interferometry and coronagraphy, based on a couple of crossed beamsplitter…
Telluric-line subtraction in high-accuracy velocimetry: a PCA-based approach
Étienne Artigau, Nicola Astudillo-Defru, Xavier Delfosse +8
Optical velocimetry has led to the detection of more than 500 planets to date and there is a strong effort to push m/s velocimetry to the near-infrared to access cooler and lighter…
SPIRou: the near-infrared spectropolarimeter/high-precision velocimeter for the Canada-France-Hawaii telescope
Étienne Artigau, Driss Kouach, Jean-François Donati +30
SPIRou is a near-IR échelle spectropolarimeter and high-precision velocimeter under construction as a next-generation instrument for the Canada-France-Hawaii-Telescope. It is desig…
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…
Apodized phase mask coronagraphs for arbitrary apertures. II. Comprehensive review of solutions for the vortex coronagraph
Alexis Carlotti, Laurent Pueyo, Dimitri Mawet
With a clear circular aperture, the vortex coronagraph perfectly cancels an on-axis point source and offers a 0.9 or 1.75 lambda/D inner working angle for topological charge 2 or 4…
Characterization and Physical Explanation of Energetic Particles on Planck HFI Instrument
A. Catalano, P. Ade, Y. Atik +30
The Planck High Frequency Instrument (HFI) has been surveying the sky continuously from the second Lagrangian point (L2) between August 2009 and January 2012. It operates with 52 h…
SPARCO : a semi-parametric approach for image reconstruction of chromatic objects
J. Kluska, F. Malbet, J. -P. Berger +6
The emergence of optical interferometers with three and more telescopes allows image reconstruction of astronomical objects at the milliarcsecond scale. However, some objects conta…
Impact of particles on the Planck HFI detectors: Ground-based measurements and physical interpretation
A. Catalano, P. Ade, Y. Atik +31
The Planck High Frequency Instrument (HFI) surveyed the sky continuously from August 2009 to January 2012. Its noise and sensitivity performance were excellent, but the rate of cos…
Performance and calibration of the NIKA camera at the IRAM 30 m telescope
A. Catalano, M. Calvo, N. Ponthieu +34
The New IRAM KID Array (NIKA) instrument is a dual-band imaging camera operating with Kinetic Inductance Detectors (KID) cooled at 100 mK. NIKA is designed to observe the sky at wa…