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27 papers · 2 filters
Observing with NIKA2Pol from the IRAM 30m telescope. Early results on the commissioning phase
A. Ritacco, R. Adam, P. Ade +41
The NIKA2 polarization channel at 260 GHz (1.15 mm) has been proposed primarily to observe galactic star-forming regions and probe the critical scales between 0.01-0.05 pc at which…
NIKA2 mapping and cross-instrument SED extraction of extended sources with Scanamorphos
H. Roussel, N. Ponthieu, R. Adam +38
The steps taken to tailor to NIKA2 observations the Scanamorphos algorithm (initially developed to subtract low-frequency noise from Herschel on-the-fly observations) are described…
Deep Learning for space-variant deconvolution in galaxy surveys
Florent Sureau, Alexis Lechat, Jean-Luc Starck
Deconvolution of large survey images with millions of galaxies requires to develop a new generation of methods which can take into account a space variant Point Spread Function (PS…
Searching for Planets Orbiting Alpha Centauri A with the James Webb Space Telescope
Charles Beichman, Marie Ygouf, Jorge Llop Sayson +18
Alpha Centauri A is the closest solar-type star to the Sun and offers an excellent opportunity to detect the thermal emission of a mature planet heated by its host star. The MIRI c…
PySAP: Python Sparse Data Analysis Package for Multidisciplinary Image Processing
S. Farrens, A. Grigis, L. El Gueddari +7
We present the open-source image processing software package PySAP (Python Sparse data Analysis Package) developed for the COmpressed Sensing for Magnetic resonance Imaging and Cos…
Calibration and Performance of the NIKA2 camera at the IRAM 30-meter Telescope
L. Perotto, N. Ponthieu, J. -F. Macías-Pérez +45
NIKA2 is a dual-band millimetric continuum camera of 2900 Kinetic Inductance Detectors (KID), operating at and , installed at the IRAM 30-meter telescope. We p…
The Control Unit of the KM3NeT Data Acquisition System
S. Aiello, F. Ameli, M. Andre +217
The KM3NeT Collaboration runs a multi-site neutrino observatory in the Mediterranean Sea. Water Cherenkov particle detectors, deep in the sea and far off the coasts of France and I…
The polarimetric imaging mode of VLT/SPHERE/IRDIS II: Characterization and correction of instrumental polarization effects
R. G. van Holstein, J. H. Girard, J. de Boer +31
Context. Circumstellar disks and self-luminous giant exoplanets or companion brown dwarfs can be characterized through direct-imaging polarimetry at near-infrared wavelengths. SPHE…
Minimization of non common path aberrations at the Palomar telescope using a self-coherent camera
Raphael Galicher, Pierre Baudoz, Jacques-Robert Delorme +5
The two main advantages of exoplanet imaging are the discovery of objects in the outer part of stellar systems -- constraining models of planet formation --, and its ability to spe…
How effective is machine learning to detect long transient gravitational waves from neutron stars in a real search?
Andrew L. Miller, Pia Astone, Sabrina D'Antonio +12
We present a comprehensive study of the effectiveness of Convolution Neural Networks (CNNs) to detect long duration transient gravitational-wave signals lasting fro…
Non-LTE radiation hydrodynamics in PLUTO
Salvatore Colombo, Laurent Ibgui, Salvatore Orlando +5
Modeling the dynamics of most astrophysical structures requires an adequate description of the radiation-matter interaction. Several numerical (magneto)hydrodynamics codes were upg…
Euclid: Nonparametric point spread function field recovery through interpolation on a graph Laplacian
M. A. Schmitz, J. -L. Starck, F. Ngole Mboula +35
Context. Future weak lensing surveys, such as the Euclid mission, will attempt to measure the shapes of billions of galaxies in order to derive cosmological information. These surv…
Temperature stability in the sub-milliHertz band with LISA Pathfinder
M. Armano, H. Audley, J. Baird +79
LISA Pathfinder (LPF) was a technology pioneering mission designed to test key technologies required for gravitational wave detection in space. In the low frequency regime (milli-H…
Follow-up procedure for gravitational wave searches from isolated neutron stars using the time-domain -statistic method
Magdalena Sieniawska, Michał Bejger, Andrzej Królak
Among promising sources of gravitational waves are long-lived nearly periodic signals produced by rotating, asymmetric neutron stars. Depending on the astrophysical scenario, the s…
Monte Carlo studies for the optimisation of the Cherenkov Telescope Array layout
A. Acharyya, I. Agudo, E. O. Angüner +467
The Cherenkov Telescope Array (CTA) is the major next-generation observatory for ground-based very-high-energy gamma-ray astronomy. It will improve the sensitivity of current groun…
Single-mode interferometric field of view in partial turbulence correction. Application to the observation of the environment of Sgr A* with GRAVITY
Guy Perrin, Julien Woillez
Context. The GRAVITY instrument on the ESO VLTI is setting a new mark in the landscape of optical interferometers. Long exposures are possible for the first time in this wavelength…
The PLATO Solar-like Light-curve Simulator: A tool to generate realistic stellar light-curves with instrumental effects representative of the PLATO mission
R. Samadi, A. Deru, D. Reese +10
The preparation of science objectives of the ESA's PLATO space mission will require the implementation of hare-and-hound exercises relying on the massive generation of representati…
Representation learning for automated spectroscopic redshift estimation
Joana Frontera-Pons, Florent Sureau, Bruno Moraes +2
Determining the radial positions of galaxies up to a high accuracy depends on the correct identification of salient features in their spectra. Classical techniques for spectroscopi…
The GRAND project and GRANDProto300 experiment
Olivier Martineau-Huynh
The Giant Array for Neutrino Detection (GRAND) is a proposal for a giant observatory of ultra-high energy cosmic particles (neutrinos, cosmic rays and gamma rays). It will be compo…
Primary beam effects of radio astronomy antennas: I. Modelling the Karl G. Jansky Very Large Array (VLA) L-band beam using holography
K. Iheanetu, J. N. Girard, O. Smirnov +5
Modern interferometric imaging relies on advanced calibration that incorporates direction-dependent effects. Their increasing number of antennas (e.g. in LOFAR, VLA, MeerKAT/SKA) a…
The mini-GWAC optical follow-up of the gravitational wave alerts: results from the O2 campaign and prospects for the upcoming O3 run
D. Turpin, C. Wu, X. H. Han +34
The second observational campaign of gravitational waves organized by the LIGO/Virgo Collaborations has led to several breakthroughs such as the detection of gravitational wave sig…
SPHERE: the exoplanet imager for the Very Large Telescope
J. -L. Beuzit, A. Vigan, D. Mouillet +108
Observations of circumstellar environments to look for the direct signal of exoplanets and the scattered light from disks has significant instrumental implications. In the past 15…
Bandpass mismatch error for satellite CMB experiments II: Correcting for the spurious signal
Ranajoy Banerji, Guillaume Patanchon, Jacques Delabrouille +4
Future Cosmic Microwave Background (CMB) satellite missions aim at using the B-mode polarisation signal to measure the tensor-to-scalar ratio with a sensitivity of the o…
ALMA Autocorrelation Spectroscopy of Comets: The HCN/H^13CN ratio in C/2012 S1 (ISON)
M. A. Cordiner, M. Y. Palmer, M. de Val-Borro +11
The Atacama Large Millimeter/submillimeter Array (ALMA) is a powerful tool for high-resolution mapping of comets, but the main interferometer (comprised of 50x12-m antennas) is ins…