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27 papers · 2 filters
Six winters of photometry from Dome C, Antarctica: challenges, improvements, and results from the ASTEP experiment
N. Crouzet, D. Mékarnia, T. Guillot +26
ASTEP (Antarctica Search for Transiting ExoPlanets) is a pilot project that aims at searching and characterizing transiting exoplanets from Dome C in Antarctica and to qualify this…
The VIMOS Public Extragalactic Redshift Survey (VIPERS): PCA-based automatic cleaning and reconstruction of survey spectra
A. Marchetti, B. Garilli, B. R. Granett +34
Identifying spurious reduction artefacts in galaxy spectra is a challenge for large surveys. We present an algorithm for identifying and repairing residual spurious features in sky…
Using the Multi-Object Adaptive Optics demonstrator RAVEN to observe metal-poor stars in and towards the Galactic Centre
Masen Lamb, Kim Venn, David Andersen +16
The chemical abundances for five metal-poor stars in and towards the Galactic bulge have been determined from H-band infrared spectroscopy taken with the RAVEN multi-object adaptiv…
William Herschel Telescope site characterization using the MOAO pathfinder CANARY on-sky data
O. A. Martin, C. M. Correia, E. Gendron +8
Canary is the Multi-Object Adaptive Optics (MOAO) pathfinder for the future MOAO-assisted Integral-Field Units (IFU) proposed for Extremely Large Telescopes (ELT). The MOAO concept…
Wave-front error breakdown in LGS MOAO validated on-sky by CANARY
O. A. Martin, É. Gendron., G. Rousset +7
CANARY is the multi-object adaptive optics (MOAO) on-sky pathfinder developed in the perspective of Multi-Object Spectrograph on Extremely Large Telescopes~(ELTs). In 2013, CANARY…
PSF reconstruction validated using on-sky CANARY data in MOAO mode
O. A. Martin, C. M. Correia, E. Gendron +8
In preparation of future Multi-Object Spectrographs (MOS) whose one of the major role is to provide an extensive statistical studies of high redshifted galaxies surveyed, the demon…
Statistics of Turbulence Parameters at Maunakea using multiple wave-front sensor data of RAVEN
Yoshito H. Ono, Carlos M. Correia, Dave R. Andersen +5
Prior statistical knowledge of the atmospheric turbulence is essential for designing, optimizing and evaluating tomographic adaptive optics systems. We present the statistics of th…
Inauguration and First Light of the GCT-M Prototype for the Cherenkov Telescope Array
J. J. Watson, A. De Franco, A. Abchiche +66
The Gamma-ray Cherenkov Telescope (GCT) is a candidate for the Small Size Telescopes (SSTs) of the Cherenkov Telescope Array (CTA). Its purpose is to extend the sensitivity of CTA…
The Gamma-ray Cherenkov Telescope for the Cherenkov Telescope Array
L. Tibaldo, A. Abchiche, D. Allan +67
The Cherenkov Telescope Array (CTA) is a forthcoming ground-based observatory for very-high-energy gamma rays. CTA will consist of two arrays of imaging atmospheric Cherenkov teles…
Towards an automatic system for monitoring of CN2 and wind speed profiles with GeMS
E. Masciadri, B. Neichel, A. Guesalaga +1
Wide Field Adaptive Optics (WFAO) systems represent the more sophisticated AO systems available today at large telescopes. A critical aspect for these WFAO systems in order to deli…
The GCT camera for the Cherenkov Telescope Array
Anthony M. Brown, A. Abchiche, D. Allan +63
The Gamma-ray Cherenkov Telescope (GCT) is proposed for the Small-Sized Telescope component of the Cherenkov Telescope Array (CTA). GCT's dual-mirror Schwarzschild-Couder (SC) opti…
Prime Focus Spectrograph (PFS) for the Subaru Telescope: Overview, recent progress, and future perspectives
Naoyuki Tamura, Naruhisa Takato, Atsushi Shimono +97
PFS (Prime Focus Spectrograph), a next generation facility instrument on the 8.2-meter Subaru Telescope, is a very wide-field, massively multiplexed, optical and near-infrared spec…
Speckle lifetime in XAO coronagraphic images: temporal evolution of SPHERE coronagraphic images
J. Milli, T. Banas, D. Mouill +11
The major source of noise in high-contrast imaging is the presence of slowly evolving speckles that do not average with time. The temporal stability of the point-spread-function (P…
The FLARE mission: Deep and Wide-field 1-5m Imaging and Spectroscopy for the Early Universe: a proposal for M5 Cosmic Vision call
D. Burgarella, P. Levacher, S. Vives +2
FLARE (First Light And Reionization Explorer) is a space mission that will be submitted to ESA (M5 call). Its primary goal (about 80% of lifetime) is to identify and study galaxies…
Flexible focal plane arrays for UVOIR wide field instrumentation
Emmanuel Hugot, Wilfried Jahn, Bertrand Chambion +7
LAM and CEA-LETI are developing the technology of deformable detectors, for UV, VIS or NIR applications. Such breakthrough devices will be a revolution for future wide field imager…
Natural guide-star processing for wide-field laser-assisted AO systems
Carlos M. Correia, Benoit Neichel, Jean-Marc Conan +5
Sky-coverage in laser-assisted AO observations largely depends on the system's capability to guide on the faintest natural guide-stars possible. Here we give an up-to-date status o…
Correction of distortion for optimal image stacking in Wide Field Adaptive Optics: Application to GeMS data
A. Bernard, L. M. Mugnier, B. Neichel +6
The advent of Wide Field Adaptive Optics (WFAO) systems marks the beginning of a new era in high spatial resolution imaging. The newly commissioned Gemini South Multi-Conjugate Ada…
Large-scale retrospective relative spectro-photometric self-calibration in space
Katarina Markovic, Will J. Percival, Marco Scodeggio +7
We consider the application of relative self-calibration using overlap regions to spectroscopic galaxy surveys that use slit-less spectroscopy. This method is based on that develop…
Laboratory validation of the dual-zone phase mask coronagraph in broadband light at the high-contrast imaging THD-testbed
J. R. Delorme, M. N'Diaye, R. Galicher +6
Specific high contrast imaging instruments are mandatory to characterize circumstellar disks and exoplanets around nearby stars. Coronagraphs are commonly used in these facilities…
Deep GeMS/GSAOI near-infrared observations of N159W in the Large Magellanic Cloud
A. Bernard, B. Neichel, M. R. Samal +5
Aims. The formation and properties of star clusters at the edge of H II regions are poorly known, partly due to limitations in angular resolution and sensitivity, which become part…
First performance of the gems + gmos system. Part1. Imaging
Pascale Hibon, Vincent Garrel, Benoit Neichel +6
During the commissioning of the Gemini MCAO System (GeMS), we had the opportunity to obtain data with the Gemini Multi-Object Spectrograph (GMOS), the most utilised instrument at G…
Multi time-step wave-front reconstruction for tomographic Adaptive-Optics systems
Yoshito H. Ono, Masayuki Akiyama, Shin Oya +5
In tomographic adaptive-optics (AO) systems, errors due to tomographic wave-front reconstruction limit the performance and angular size of the scientific field of view (FoV), where…
TRIPPy: Trailed Image Photometry in Python
Wesley C. Fraser, Mike Alexandersen, Megan E. Schwamb +6
Photometry of moving sources typically suffers from reduced signal-to-noise (SNR) or flux measurements biased to incorrect low values through the use of circular apertures. To addr…
State of the Field: Extreme Precision Radial Velocities
Debra Fischer, Guillem Anglada-Escude, Pamela Arriagada +53
The Second Workshop on Extreme Precision Radial Velocities defined circa 2015 the state of the art Doppler precision and identified the critical path challenges for reaching 10 cm/…