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23 papers · 2 filters
Deep learning Approach for Classifying, Detecting and Predicting Photometric Redshifts of Quasars in the Sloan Digital Sky Survey Stripe 82
Johanna Pasquet-Itam, Jérôme Pasquet
We apply a convolutional neural network (CNN) to classify and detect quasars in the Sloan Digital Sky Survey Stripe 82 and also to predict the photometric redshifts of quasars. The…
The NIKA2 instrument at 30-m IRAM telescope: performance and results
A. Catalano, R. Adam, P. A. R. Ade +84
The New IRAM KID Arrays 2 (NIKA2) consortium has just finished installing and commissioning a millimetre camera on the IRAM 30 m telescope. It is a dual-band camera operating with…
Capabilities of ACAD-OSM, an active method for the correction of aperture discontinuities
Johan Mazoyer, Laurent Pueyo, Mamadou N'Diaye +4
The increasing complexity of the aperture geometry of the future space- and ground based-telescopes will limit the performance of the next generation of coronagraphic instruments f…
A fast, wide-field and distortion-free telescope with curved detectors for surveys at ultra-low surface brightness
Eduard Muslimov, David Valls-Gabaud, Gérard Lemaître +6
We present the design of an all-reflective, bi-folded Schmidt telescope aimed at surveys of extended astronomical objects with extremely-low surface brightness. The design leads to…
Deformable mirror interferometric analysis for the direct imagery of exoplanets
Johan Mazoyer, Raphaël Galicher, Pierre Baudoz +3
Direct imaging of exoplanet systems requires the use of coronagraphs to reach high contrast levels (10^-8 to 10^-11) at small angular separations (0.1"). However, the performance o…
Performance of the extreme-AO instrument VLT/SPHERE and dependence on the atmospheric conditions
J. Milli, D. Mouillet, T. Fusco +10
SPHERE is the high-contrast exoplanet imager and spectrograph installed at the Unit Telescope 3 of the Very Large Telescope. After more than two years of regular operations, we ana…
Optimal correction of distortion for High Angular Resolution images. Application to GeMS data
A. Bernard, B. Neichel, L. M. Mugnier +1
Whether is ground-based or space-based, any optical instrument suffers from some amount of optical geometric distortion. Recently, the diffraction-limited image quality afforded by…
Active correction of aperture discontinuities - optimized stroke minimization I: a new adaptive interaction matrix algorithm
J. Mazoyer, L. Pueyo, M. N'Diaye +7
Future searches for biomarkers on habitable exoplanets will rely on telescope instruments that achieve extremely high contrast at small planet-to-star angular separations. Coronagr…
CFHQSIR: a Y-band extension of the CFHTLS-Wide survey
S. Pipien, S. Basa, J. -G. Cuby +6
The Canada-France-Hawaii Telescope Legacy Survey (CFHTLS) has been conducted over a five-year period at the CFHT with the MegaCam instrument, totaling 450 nights of observations. T…
Data Acquisition Architecture and Online Processing System for the HAWC gamma-ray observatory
HAWC collaboration, A. U. Abeysekara, R. Alfaro +105
The High Altitude Water Cherenkov observatory (HAWC) is an air shower array devised for TeV gamma-ray astronomy. HAWC is located at an altitude of 4100 m a.s.l. in Sierra Negra, Me…
SCALA: In-situ calibration for Integral Field Spectrographs
S. Lombardo, D. Küsters, M. Kowalski +39
The scientific yield of current and future optical surveys is increasingly limited by systematic uncertainties in the flux calibration. This is the case for Type Ia supernova (SN I…
Disproval of the validated planets K2-78b, K2-82b, and K2-92b
J. Cabrera, S. C. C. Barros, D. Armstrong +13
Transiting super-Earths orbiting bright stars in short orbital periods are interesting targets for the study of planetary atmospheres. While selecting super-Earths suitable for fur…
Quantifying telescope phase discontinuities external to AO-systems by use of Phase Diversity and Focal Plane Sharpening
Masen Lamb, Carlos Correia, Jean-Francois Sauvage +7
We propose and apply two methods to estimate pupil plane phase discontinuities for two realistic scenarios on VLT and Keck. The methods use both Phase Diversity and a form of image…
The NIKA2 large field-of-view millimeter continuum camera for the 30-m IRAM telescope
Remi Adam, Amar Adane, P. A. R. Ade +45
Millimeter-wave continuum astronomy is today an indispensable tool for both general Astrophysics studies and Cosmology. General purpose, large field-of-view instruments are needed…
Exploring Cosmic Origins with CORE: Survey requirements and mission design
J. Delabrouille, P. de Bernardis, F. R. Bouchet +200
Future observations of cosmic microwave background (CMB) polarisation have the potential to answer some of the most fundamental questions of modern physics and cosmology. In this p…
Automated reliability assessment for spectroscopic redshift measurements
S. Jamal, V. Le Brun, O. Le Fèvre +7
We present a new approach to automate the spectroscopic redshift reliability assessment based on machine learning (ML) and characteristics of the redshift probability density funct…
An Application of Multi-band Forced Photometry to One Square Degree of SERVS: Accurate Photometric Redshifts and Implications for Future Science
Kristina Nyland, Mark Lacy, Anna Sajina +7
We apply The Tractor image modeling code to improve upon existing multi-band photometry for the Spitzer Extragalactic Representative Volume Survey (SERVS). SERVS consists of post-c…
Advanced modelling of a moderate-resolution holographic spectrograph
Eduard Muslimov, Gennady Valyavin, Sergei Fabrika +1
In the present article we consider an accurate modeling of spectrograph with cascade of volume-phase holographic gratings. The proposed optical scheme allows to detect spectra in a…
Deep Convolutional Neural Networks as strong gravitational lens detectors
C. Schaefer, M. Geiger, T. Kuntzer +1
Future large-scale surveys with high resolution imaging will provide us with a few new strong galaxy-scale lenses. These strong lensing systems however will be contained in…
Fine cophasing of segmented aperture telescopes with ZELDA, a Zernike wavefront sensor in the diffraction-limited regime
Pierre Janin-Potiron, Mamadou N'Diaye, Patrice Martinez +3
Segmented aperture telescopes require an alignment procedure with successive steps from coarse alignment to monitoring process in order to provide very high optical quality images…
The Hyper Suprime-Cam SSP Survey: Overview and Survey Design
H. Aihara, N. Arimoto, R. Armstrong +139
Hyper Suprime-Cam (HSC) is a wide-field imaging camera on the prime focus of the 8.2m Subaru telescope on the summit of Maunakea in Hawaii. A team of scientists from Japan, Taiwan…
An analytic expression for coronagraphic imaging through turbulence. Application to on-sky coronagraphic phase diversity
Olivier Herscovici-Schiller, Laurent M. Mugnier, Jean-François Sauvage
The ultimate performance of coronagraphic high contrast exoplanet imaging systems such as SPHERE or GPI is limited by quasi-static aberrations. These aberrations produce speckles t…
The Euclid Data Processing Challenges
Pierre Dubath, Nikolaos Apostolakos, Andrea Bonchi +37
Euclid is a Europe-led cosmology space mission dedicated to a visible and near infrared survey of the entire extra-galactic sky. Its purpose is to deepen our knowledge of the dark…